I think it takes a lot for someone to go so far and have run into a problem and admit the problem is insurmountable than to "gloss" over the fact and claim success. I really enjoy your videos and "...as always... stay creative and I will see you next time."
I fully agree. Much too often, doomed projects are being kept alive and attempted to be salvaged just because "We spent so much time and money on it already, so all that would be wasted if we stop now!" Great Scott made the right decision here: Giving up and concluding that "Buy" is the right decision for him, and providing us with his findings, so that we may make an informed decision to also Buy instead of DIY, or alternatively, DIY while building on his knowledge. It takes guts and discipline to abandon a project you already spent a lot of resources on. Thanks, Great Scott!!!
With super capacitors in series, you really need some over-voltage protection on each individual capacitor. Without this protection, the variations between the individual capacitors (capacity and leakage) means that you will over-voltage some of the capacitors even though the average voltage per capacitor is within the safe working range.
I really love that you not only do a good job, but that you remain humble and give that good vibe that practice makes perfect. I do custom modding for ecigs. I'm still somewhat new. I'm looking to get into making my own pcb pwm. Not too complicating with a schematic the problem I have is that I really lack knowledge of what the components actually do. So, now that I know that, it's time to learn even more
Yeah! I don't get the point of videos like this ether. It's one thing to show you misstakes and how you solve the problem. That is also helpful to others. But show a video where you give up and buy the product instead it's quite pointless - especially since the product wasn't that cheap to buy ether. There is another video that's even worse when he tries to build a microphone (search for Voice over microphone DIY or buy) and end up buying one that has worse audio quality than my DIY microphones I use for my videos. Still it costs like 10 times as much. Yeah - I want to show people that they shouldn't try to build their own microphone, because I don't know how to build a good one my self. I should make a video my self about how to build good microphones, but have been to lazy to do that (maybe later). I'm not complaining on this guy in general - he has a lot of knowledge about programming and stuff that I have no idea about, but posting videos where you just give up and buy the product instead isn't helping anyone.
Ride84XL exactly my point We don't have 200€ for a gear like this we would rather copy 1:1 other design (youtube?) And give credit to the maker saying we copied 1:1 I think he has to take the perspective of saving every cent he can like all poor hobbysts do? I'm sure there are a lot of solutions Man for 200€ for as simple thing like this...
Ride84XL, The Chemical Workshop, seriously, you complain because he can not give you a free ride to how to diy a spotwelder? He even TELS you right after the FIRST minute it fails. Come on please.
Bringamosa I think the complaint is the "DIY or buy" title combined with "I tried it, failed, and kinda gave up rather than trying to come up with a solution for the problem I ran into" instead building one that works then objectively comparing the costs & maybe even performance. However, it is April fools day, so who knows if this is a serious video or not
DIY!!!! Thank you for posting this (barely) non successful attempt. I learn a lot from your videos and one of the more interesting this things is not only did I mostly understand what you described,, but rather I appreciate the not wanting to solder such complexity anymore. I think the idea of breadboard then direct to pcb is becoming more and more feasible. Thanks for sharing this tutorial.
That is why you build it on breadboard or stripboard. You can easily mod the circuit if it goes wrong or unsolder all the components and reuse the strip board.
LOL.. so if you always fail, you become super intelligent, that is bullshit... Occasionally if you fail, it teaches you, but what teaches you more is when you succeed.
All of this... and I all I did was soldering two copper ends for contact on the 400F capacitor and a JST connector for charging. I got a step-down voltage converter that allows me to plug this into a USB power supply and charged it all the way up to 2.7V. The current dropped as the capacitor became full and it worked perfectly as the project was simple. I'm gonna make a 2S lithium ion battery for 37 minute flight time for my airplane. Thanks Scott for your wonderful videos as complex and knowledgeable as they are.
Hey GreatScott! thanks for the new video. Just wanted to mention when you were trying to parallel the MOSFETs you should use a small resistance on each source pin. MOSFETs don't like to be paralleled and don't naturally balance the power without some resistance.
I like your honesty, even when you fail due to errors we all do with projects, you still present valuable informtive and clean instruction as to why. Thank you keep it up
Congratulations mate. A great lesson to everyone in how you handle getting it wrong is what makes you humble when you get success. I have no idea about all the tech calculations or what half the components are, but I loved watching and listening to you explaining it all. Great effort. P.S If Mr Samsung or Mr Sony had of thought about buying something instead of making it, they'd both probably still be working for Mr Pioneer. Hahahahahaha
Well, I really like your videos and that you are so honest to yourself. However, when I look on some of your projects, especially the failed ones, I always think : "Maybe he should stop reinventing the wheel and take already existing working and proven solutions from other hackers and bring them to the next level!" Seriously, you have the knowledge and the experience. And many projects are not very well explained. So you could really be the right person in these areas. This video is another example. There are so many, even arduino driven, welders like this from other hackers. And they work.
Can you if possible elaborate more on the problem you faced in your design and the solution for this problem since I really didn't understand what exactly was the problem and how to fix it! thanks
yeah man, how many amps exactly do nickle stripes require for how long @which voltage? am i required to have a pulsating cirquit? can't I just deliver that pulse manually? How much complexity is actually necessary for spotwelding?
I use a 300 cca lithium battery and even with the solenoid it delivers too much power and end up burning a hole on the nickel table. Trying an arduino controlled solenoid rn
@@IamG3X I've seen somewhere a vidéo with just a Maxwell 350F ultra capacitor and it seems to work well. I already tryed with my little car battery, it was a disaster
Maybe we must ad to the little car battery a "welding time controller" to out a more precise current? And that would be that simple no? So it would cost nearly nothing. I'm wrong? I Can explain the origin of universe also. But no one care
@Smattless sir lol. i actually watched the guy that you linked. i use his idea of the solenoid as an on/off switch but it still TOO POWERFUL for the nickel strips. I thought you can use to arduino relay to turn the solenoid on and off better than your finger. idk
And this video perfectly shows why not to bother buying a custom PCB for uncertain project. I still think it is possible to create a good(cost effective) diy CD welder with little bit tweaking. Keep up the good work.. :)
GreatScott!+ It has to be surreal having nearly a million people that love your work and to stop here would be a crying shame and a crime to the tech world. Great Scott!
You will not short your power supply since the positive lead of the capacitors goes through a resistor to the psu (the resistor for slower charging). So it will draw some current from the psu, but it won't shorten it. However you have other mistakes, which will probably kill your transistors. You have wired your discharge N-mos transistors on the high side. That's a big no-no since you are not driving them with a high side driver! The proper way here would be to ground the transistors and connect the welding electrodes between the negative lead of the capacitors and the transistor drain. I don't know why are you using drivers anyways' since you picked a logic level gate transistor?!? Overall it would take no more than 10min to fix it so i see no reason to quit, just cut the trace from the discharge transistors to the negative of the capacitors and use that trace for one side of the electrode and the negative of the capacitors for the other. Don't cut the trace from the cap negative to the charging transistor and ground the source of the discharging transistors. That's it.
I will probably not explain i well enough, but here how it is from a practical point of view: Lets, say you are using mosfets to turn on a 12v car bulb. Let's say you are using a logic level n-mos which can switch plenty of current at 5V at the gate. The correct way to wire everything would be +12v to the first lead of the bulb, the second lead of the bulb goes to the drain and the source goes to ground. When you apply 5v between ground and gate (which in this case is the same as applying it between the source and gate) your bulb will light up and the transistor would be fine, because 5V at the gate would be enough for, lets say, 10A of current to pass through it. Now let's say you install the n-mos on the high side, meaning +12v goes to the drain, source goes to the bulb and the second lead of the bulb goes to ground you will have a problem. You apply 5V between the ground and the gate, but that's not the same as applying it between the source and gate. There will be significant source offset from ground, because of the lamp that is between ground and source. So, your transistor is turned off, so the resistance between drain and source is practically infinte for you. You apply 5V to the gate and the transistor is starting to turn on. The resistance of the bulb is, let's say, 2ohm. As the resistor is turning on, the resistance between drain and source begins to fall. That resistance might be very low when the transistor is in it's ON state (in most cases lower than 0.1 ohm), but it won't go there instantly . It will fall very quickly but let's say it reaches 4ohm in 50us. At 4 ohm at the transistor and 2ohm at the bulb you will form, effectively a voltage divider. That would mean 4V at the source. And you have 5V at the gate - that would mean 1V between source and gate! That would definitely not be enough to turn on the transistor, so it would balance in that state. So now you will have a very dimly lit light bulb and a very hot transistor. So If you want to use a n-mos transistor on the high side you should use a high side driver which will deliver the proper voltage between gate and source. The alternative is to use p-mos, but you still have to use a driver, and generally n-mos transistors are better. English is not my native language so sorry about the (possibly) confusing explanation.
www.infineon.com/dgdl/Infineon-BTS555+E3146-DS-v01_00-EN.pdf?fileId=5546d4625a888733015aa3f57e5e103e :-) Done ! (Power Supply , 1k resistor to Caps, caps to BTS555, bts555 to welding tips. the cap legs are too thin for high current tho...)
Thanks for sharing... Alot of DIY'ers post video that are successful and don't or rarely show the disadvantages. You my friend are a trust worthy guy and your videos seem more authentic. Good job. After all failing is how we succeed ! 👍
I had my parents thinking you were me in the video!!! I told them I started making youtube videos using a pseudonym and a fake accent. I had them going for a while, and they looked rather proud of me, then I said "Aprillll fooooools!" lol
Doesn't matter if it's a fail or win. Your videos are amazing to watch, you speak clearly, it's easy to understand and they're always interesting to watch :)
you can weld the positive terminal. you just have to put both of the electrodes on the terminal, otherwise the current will go through the battery. but nothing stops you from welding with the car battery in that way.
Solder Joe - The comprehension problem is your failure to comprehend the path of least resistance. You have gone full on tard here, check yourself next time.
Thank you for this video. I had bread boarded a project and got it working then was transferring it too perf board after all that work it didn't work. I started to get unmotivated after hours of trying to figure out why it didn't work. Until I saw this video even after all your work you didn't get it right. But you still learned with a failure and helped others. I'll start fresh and won't let my failure get in the way of trying projects. Great video.
Helo sorry for my Eanglish because I from Poland :) . I like your films it's so amazing . I interesting electronic I have 11 years ago sorry for my English .
Dear friend I'm 58 years old almost 59 and you know how many times I have failed I can't even count them all so don't feel bad thanks for showing us your failure because that's how we all learn through our failures and the more of us that show our failures the more of us learn how not to fail which is what it's all about!
I appreciate you posting this. It was a fun watch, learned a few things, and felt better about some of my own mistakes. Nice to know we are all just learning as we go.
Great scott: builds a special circuit for welding. Me who don't know how to make a circuit: just connect all up to 12 volts capacitors that I can find in parallel and charging them with a 12 volts battery and shorting it for welding 😂
Electronics is purely mathematics, not trying and making mistakes -procedure. You can predict pretty well just by looking the schematics that does it work or not.
The way you present your project is very good and you make it fun ti watch no matter of the spoiler from the beggining. Keep up great work Great Scott!
Because, even though super capacitors have a "super" in their name, the amount of energy stored is big only relative to its not-super relatives. LiPo, or LiIon, or even any alkaline battery has far more energy stored than even super capacitors.
This is really not a video to show, at least go more into the detail process on how you designed the gate drive wrong and also the fixing process. Otherwise this is useless, its always easier to buy something, but DIY is the way to go if you want to learn something.
April Fools joke or not. I honestly do appreciate that you both show your success and failures here on UA-cam. Both with incorrect components PCB layouts to missing circuit parts. It's good to learn from failures... and fun to watch yours. 😆
It sucks that this project didn't work so spectacularly for you. :( But at the same time though there's still tons to learn from stuff like this! Like how you pointed out that the MOSFETs needed a proper reference voltage for them to be able to properly switch on, and so forth. :)
Super capacitors blow my mind. When I was a kid, I read in an electronics textbook that 1 Farad capacitors were impossible and, if they were, would be the size of a house... and here you are with a 100 F super capacitor in your hand.
Every successful project undergoes a lot of work, which is most often a complete failure. Having the courage to try again and again, makes it then a masterpiece. And, who never has put a soldering iron in their hand, are easy to criticize other people 😊
Thanks brother; I learn a lot.taking of spot welders;hoping to see battery welder .sorry for poor English.my english is not good. Always respect to u;for everything u have done for us.
Excellent Video GreatScott! It's nice to see that even yourself has genuine failures and you're not afraid to share them so we can all learn! I will continue to support you through patreon! :)
We did something similar at home with the Mic transformer. 3 turns of 25mm^2 cable on the secondary, gave us ~3v 1200amps. Then used a broken toaster circuit (element snapped), as the timer. Swapped the electromagnet with a 240v solid-state relay and a few caps to reduce the "toasting" time frame. Together with a foot switch and doneski ;) the perfect fix for replacing old power tool battery packs
You have the same issue I do, you use too much solder. I was however amazed how easily you created a PCB and had it sent to a company to be created.. bravo
I'm not sure if this has been mentioned before, but how about using SCR's instead of mosfets? From my limited knowledge of googling and looking up on wikipedia it supports forward blocking, forward conducting and reverse blocking modes.
36v is needed to break down the air enough to create a sufficent arc although 24v would work just know you need like 90 amps. Im in welding school and i hope this basic info helps your welding projects because id love to see you make a working one
Been watching your channel years but currently trying to build a similar thing so using this for reference and i just have to say i miss this opening scene
I'm sorry to see that your project failed. too bad. But that is the thing that makes us better engineers. check for details that we missed in our last project. I enjoy watching your videos. Thanks for sharing.
The only answer I found is to put a p-channel mosfet between cap+ and VCC that opens at the same time as the charging mosfet. And one question, why did you put P3? It's a pad that would connect directly cap- to GND, so you would have no control to charge the capacitors, right?
Hey. I've been soldering a lot of cells lately, and I think I found pretty good method to do it, without heating cells too much. I used transformer soldering iron with tip was partly damaged which made it work. What you need is a tip with very thick copper bars, that are connected by a thin wire. Thin wire gets hot enough to melt solder, and then the current flows directly through it, melting it much quicker, and getting it to stick everywhere. I've soldered a good amoung of cells like this with pretty good results, and the contact area is quite high as well.
Use a separate power supply for the control circuit so that the drive voltage to the switching FETS remains above 6-7V as the supercapacitors discharge AND voltage drops won't kill your Fets. You could also use a diode and a large decoupling capacitor going to the control circuit.
You can just use a solenoid circuit to short a car battery accross the welding tips. Super simple and works great. There are a few UA-cam videos using this method.
Great video ! You're my (very creative) hero ! I'm just in the process of... buying or DIY of a spot welder. I'd prefer DIY since I have a lot of gear lying around.... However, buying is of course much easier but it doesn't give you the same satisfaction ! Congratz !
I maybe wrong but isn't of couple of relays , transistor and diac could theoretically get the job done? I mean all we need to do is to charge the capacitor and avoid overcharging.
The most important for a super capacitor welder is the charging circuit. Simply charging them in series is dangerous, especially for those bulky ultracapacitors.
if we use a separate isolated power supply for charging the capacitor and uses switches like relay We can make this work right actually I am new to electronics just trying to improve my debugging skills
If you succeded on the first try how would the prices compare? Would the DIY working one be worth it over the bought one? How efficient would they be comparatively?
Hey Great Scott! Thanks for another fantastic video! Do you think you could go into detail as to why this DIY wielder did not work? From what I can understand you needed the Mosfet Driver IC's to have the same ground potential as the Mosfets they were driving, and I understand how this would cause them not to turn on. However how does changing the ground point of the mosfet to be the same as the drive cause a short? I'm sure there is a reason, I just can't find it. P.S Love your vids!
Oh, man... You have to fix it! It's a matter of honor now!
I will see what I can do
put the super caps on the PCB (with a lockout jumper), or put a screw terminal for them
Sparky BearBomb Or he can use a protection board made for super caps.
that's a great idea, can be used for more projects then =)
Sparky BearBomb Absolutely!
buying a product obviously saves you nerves...the reason people are doing diy is the learning part that comes along with it
Projects are often fun as well, and expandable.
I think it takes a lot for someone to go so far and have run into a problem and admit the problem is insurmountable than to "gloss" over the fact and claim success. I really enjoy your videos and "...as always... stay creative and I will see you next time."
I fully agree. Much too often, doomed projects are being kept alive and attempted to be salvaged just because "We spent so much time and money on it already, so all that would be wasted if we stop now!"
Great Scott made the right decision here: Giving up and concluding that "Buy" is the right decision for him, and providing us with his findings, so that we may make an informed decision to also Buy instead of DIY, or alternatively, DIY while building on his knowledge.
It takes guts and discipline to abandon a project you already spent a lot of resources on.
Thanks, Great Scott!!!
Absolutely agree.
With super capacitors in series, you really need some over-voltage protection on each individual capacitor. Without this protection, the variations between the individual capacitors (capacity and leakage) means that you will over-voltage some of the capacitors even though the average voltage per capacitor is within the safe working range.
I really love that you not only do a good job, but that you remain humble and give that good vibe that practice makes perfect. I do custom modding for ecigs. I'm still somewhat new. I'm looking to get into making my own pcb pwm. Not too complicating with a schematic the problem I have is that I really lack knowledge of what the components actually do. So, now that I know that, it's time to learn even more
For 200€ i'd rather try again...
The Chemical Workshop me too xD
Yeah! I don't get the point of videos like this ether. It's one thing to show you misstakes and how you solve the problem. That is also helpful to others. But show a video where you give up and buy the product instead it's quite pointless - especially since the product wasn't that cheap to buy ether.
There is another video that's even worse when he tries to build a microphone (search for Voice over microphone DIY or buy) and end up buying one that has worse audio quality than my DIY microphones I use for my videos. Still it costs like 10 times as much. Yeah - I want to show people that they shouldn't try to build their own microphone, because I don't know how to build a good one my self. I should make a video my self about how to build good microphones, but have been to lazy to do that (maybe later).
I'm not complaining on this guy in general - he has a lot of knowledge about programming and stuff that I have no idea about, but posting videos where you just give up and buy the product instead isn't helping anyone.
Ride84XL exactly my point
We don't have 200€ for a gear like this we would rather copy 1:1 other design (youtube?) And give credit to the maker saying we copied 1:1
I think he has to take the perspective of saving every cent he can like all poor hobbysts do?
I'm sure there are a lot of solutions
Man for 200€ for as simple thing like this...
Ride84XL, The Chemical Workshop, seriously, you complain because he can not give you a free ride to how to diy a spotwelder? He even TELS you right after the FIRST minute it fails. Come on please.
Bringamosa I think the complaint is the "DIY or buy" title combined with "I tried it, failed, and kinda gave up rather than trying to come up with a solution for the problem I ran into" instead building one that works then objectively comparing the costs & maybe even performance.
However, it is April fools day, so who knows if this is a serious video or not
DIY!!!! Thank you for posting this (barely) non successful attempt. I learn a lot from your videos and one of the more interesting this things is not only did I mostly understand what you described,, but rather I appreciate the not wanting to solder such complexity anymore. I think the idea of breadboard then direct to pcb is becoming more and more feasible. Thanks for sharing this tutorial.
northshorepx any plan for diy laptop battery bank??
Glad you liked it :-)
I agree. I wish more people would post their failed projects too. They are more often than not important learning experiences.
That is why you build it on breadboard or stripboard. You can easily mod the circuit if it goes wrong or unsolder all the components and reuse the strip board.
@@simontay4851 yes but the temtation of not doit its great ..maybe work next time
I'm not sure if this fail is as an April Fools or not
We will never know....
I think it is a joke
Lol
He used IRL Mosfets so it can't be an april fools prank...
GreatScott! Damn, your a mastermind..
Your handwriting is impeccable.
What I learned from this video - build on breadboard first, then transfer to PCB.
thank you for all the great lessons.
You leans a lot more from failures then successes. Thank your for sharing this
LOL.. so if you always fail, you become super intelligent, that is bullshit... Occasionally if you fail, it teaches you, but what teaches you more is when you succeed.
It's a bit of both. If you fail all the time then you can get depressed and lose interest!
All of this... and I all I did was soldering two copper ends for contact on the 400F capacitor and a JST connector for charging. I got a step-down voltage converter that allows me to plug this into a USB power supply and charged it all the way up to 2.7V. The current dropped as the capacitor became full and it worked perfectly as the project was simple. I'm gonna make a 2S lithium ion battery for 37 minute flight time for my airplane. Thanks Scott for your wonderful videos as complex and knowledgeable as they are.
Hey GreatScott! thanks for the new video. Just wanted to mention when you were trying to parallel the MOSFETs you should use a small resistance on each source pin. MOSFETs don't like to be paralleled and don't naturally balance the power without some resistance.
Great to see a posted fail project. These missteps are key to learning, so good job helping us learn!
Please don't ever stop making videos. Your work is fantastic!
I like your honesty, even when you fail due to errors we all do with projects, you still present valuable informtive and clean instruction as to why. Thank you keep it up
Congratulations mate.
A great lesson to everyone in how you handle getting it wrong is what makes you humble when you get success.
I have no idea about all the tech calculations or what half the components are, but I loved watching and listening to you explaining it all.
Great effort.
P.S If Mr Samsung or Mr Sony had of thought about buying something instead of making it, they'd both probably still be working for Mr Pioneer.
Hahahahahaha
Very nice. You demonstrated the ups and downs of the inventive process. A rare type of video on UA-cam.
i think its good that you also feature your failures as well as your successes
Good on you! Failure is the best educator. Most don’t post unsuccessful attempts.
Well, I really like your videos and that you are so honest to yourself. However, when I look on some of your projects, especially the failed ones, I always think : "Maybe he should stop reinventing the wheel and take already existing working and proven solutions from other hackers and bring them to the next level!"
Seriously, you have the knowledge and the experience. And many projects are not very well explained. So you could really be the right person in these areas.
This video is another example. There are so many, even arduino driven, welders like this from other hackers. And they work.
You are one very clever lad, even though it didn't work as you expected, you've made something, millions of people couldn't. Thank you for posting.
Can you if possible elaborate more on the problem you faced in your design and the solution for this problem since I really didn't understand what exactly was the problem and how to fix it!
thanks
What he said!
yeah man, how many amps exactly do nickle stripes require for how long @which voltage? am i required to have a pulsating cirquit? can't I just deliver that pulse manually? How much complexity is actually necessary for spotwelding?
You will get there. Dont let the past few failed attempts stop you from having fun and experimenting with welding projects
Just use a 12vdc battery with at least 200 CCA up to 600 CCA and a momentary switch. Its got enough power and is super easy to do.
I use a 300 cca lithium battery and even with the solenoid it delivers too much power and end up burning a hole on the nickel table. Trying an arduino controlled solenoid rn
@@IamG3X I've seen somewhere a vidéo with just a Maxwell 350F ultra capacitor and it seems to work well. I already tryed with my little car battery, it was a disaster
Maybe we must ad to the little car battery a "welding time controller" to out a more precise current? And that would be that simple no? So it would cost nearly nothing. I'm wrong? I Can explain the origin of universe also. But no one care
@@k-member i use arduino relay to control the solenoid to switch on the battery. haven't test it out yet.
@Smattless sir lol. i actually watched the guy that you linked. i use his idea of the solenoid as an on/off switch but it still TOO POWERFUL for the nickel strips. I thought you can use to arduino relay to turn the solenoid on and off better than your finger. idk
And this video perfectly shows why not to bother buying a custom PCB for uncertain project. I still think it is possible to create a good(cost effective) diy CD welder with little bit tweaking. Keep up the good work.. :)
"Spoilers, I'm going to fail terribly. Let's get started."
Advice to live by...?
One of the best educational channels on yt right now.
You were almost there, you can fix it but... practice soldering more ;)
Love the videos....
GreatScott!+ It has to be surreal having nearly a million people that love your work and to stop here would be a crying shame and a crime to the tech world. Great Scott!
Place the Super Caps on the same board if you can. Please and Thank You.
You will not short your power supply since the positive lead of the capacitors goes through a resistor to the psu (the resistor for slower charging). So it will draw some current from the psu, but it won't shorten it. However you have other mistakes, which will probably kill your transistors. You have wired your discharge N-mos transistors on the high side. That's a big no-no since you are not driving them with a high side driver! The proper way here would be to ground the transistors and connect the welding electrodes between the negative lead of the capacitors and the transistor drain. I don't know why are you using drivers anyways' since you picked a logic level gate transistor?!? Overall it would take no more than 10min to fix it so i see no reason to quit, just cut the trace from the discharge transistors to the negative of the capacitors and use that trace for one side of the electrode and the negative of the capacitors for the other. Don't cut the trace from the cap negative to the charging transistor and ground the source of the discharging transistors. That's it.
Wolfshark Can you explain a bit more about the mosfets ? I didn't know that could be a problem, I'm curious.
I will probably not explain i well enough, but here how it is from a practical point of view:
Lets, say you are using mosfets to turn on a 12v car bulb. Let's say you are using a logic level n-mos which can switch plenty of current at 5V at the gate. The correct way to wire everything would be +12v to the first lead of the bulb, the second lead of the bulb goes to the drain and the source goes to ground. When you apply 5v between ground and gate (which in this case is the same as applying it between the source and gate) your bulb will light up and the transistor would be fine, because 5V at the gate would be enough for, lets say, 10A of current to pass through it.
Now let's say you install the n-mos on the high side, meaning +12v goes to the drain, source goes to the bulb and the second lead of the bulb goes to ground you will have a problem. You apply 5V between the ground and the gate, but that's not the same as applying it between the source and gate. There will be significant source offset from ground, because of the lamp that is between ground and source. So, your transistor is turned off, so the resistance between drain and source is practically infinte for you. You apply 5V to the gate and the transistor is starting to turn on. The resistance of the bulb is, let's say, 2ohm. As the resistor is turning on, the resistance between drain and source begins to fall. That resistance might be very low when the transistor is in it's ON state (in most cases lower than 0.1 ohm), but it won't go there instantly . It will fall very quickly but let's say it reaches 4ohm in 50us. At 4 ohm at the transistor and 2ohm at the bulb you will form, effectively a voltage divider. That would mean 4V at the source. And you have 5V at the gate - that would mean 1V between source and gate! That would definitely not be enough to turn on the transistor, so it would balance in that state. So now you will have a very dimly lit light bulb and a very hot transistor.
So If you want to use a n-mos transistor on the high side you should use a high side driver which will deliver the proper voltage between gate and source. The alternative is to use p-mos, but you still have to use a driver, and generally n-mos transistors are better.
English is not my native language so sorry about the (possibly) confusing explanation.
nessotrin ,i think he is worried about the Vgs breakdown voltage because the source of the nmos will be floating
Hehehhe. What he said!
Lol its over my head but id love to see you fix that spot welder :P
www.infineon.com/dgdl/Infineon-BTS555+E3146-DS-v01_00-EN.pdf?fileId=5546d4625a888733015aa3f57e5e103e
:-) Done !
(Power Supply , 1k resistor to Caps, caps to BTS555, bts555 to welding tips. the cap legs are too thin for high current tho...)
Thanks for sharing... Alot of DIY'ers post video that are successful and don't or rarely show the disadvantages. You my friend are a trust worthy guy and your videos seem more authentic. Good job. After all failing is how we succeed ! 👍
I had my parents thinking you were me in the video!!! I told them I started making youtube videos using a pseudonym and a fake accent. I had them going for a while, and they looked rather proud of me, then I said "Aprillll fooooools!" lol
Lol
Doesn't matter if it's a fail or win. Your videos are amazing to watch, you speak clearly, it's easy to understand and they're always interesting to watch :)
I don't know if you know AvE but he has made a video about DIY spot welding !
By car battery
Solder Joe u don't know !
you can weld the positive terminal. you just have to put both of the electrodes on the terminal, otherwise the current will go through the battery. but nothing stops you from welding with the car battery in that way.
There are numerous videos on UA-cam that prove you wrong.
Solder Joe - The comprehension problem is your failure to comprehend the path of least resistance. You have gone full on tard here, check yourself next time.
there is 100s of tab welding videos using a 12 v battery -joe is keyboard warrior
Nice to see you share your failed projects as well. Mistake is one of the biggest teachers. Thank you!
great job, i wanna see a video of ground loop isolation solution!!
Thank you for this video. I had bread boarded a project and got it working then was transferring it too perf board after all that work it didn't work. I started to get unmotivated after hours of trying to figure out why it didn't work. Until I saw this video even after all your work you didn't get it right. But you still learned with a failure and helped others. I'll start fresh and won't let my failure get in the way of trying projects. Great video.
$23.83 for shipping???
Express shipping
Shipping by crane. Not crane, a lifting device, but crane, a bird that allegedly brings babies.
Sometimes it brings them dead.
international express shipping costs i guess.
i always pay it because waiting months i cant take it.
12v high amp batttery, large solenoid, leads, button, done.
You my friend are a prime example of (german?) over-engineering.
Helo sorry for my Eanglish because I from Poland :) . I like your films it's so amazing . I interesting electronic I have 11 years ago sorry for my English .
Polaki cebulaki :D Siema
Olitoni elo co tam
Pook365 xd
Your English is better than my Polish. Well done and good luck😀
Dear friend I'm 58 years old almost 59 and you know how many times I have failed I can't even count them all so don't feel bad thanks for showing us your failure because that's how we all learn through our failures and the more of us that show our failures the more of us learn how not to fail which is what it's all about!
Did you watch Afrotechmods video about super capacitors?
He used some to melt coins and they should do the job!
nah, he used those ultracaps, not supercaps.
@@JohnCena-iw2vk same difference
I appreciate you posting this. It was a fun watch, learned a few things, and felt better about some of my own mistakes. Nice to know we are all just learning as we go.
rip 30$
true af..
EUR or USD?
Yeah... otherwise, just etch your own boards for like a $2 in materials... lol
stay creative and see u next time hahahahahaha
rip 1/2 AAA game
Great scott: builds a special circuit for welding.
Me who don't know how to make a circuit: just connect all up to 12 volts capacitors that I can find in parallel and charging them with a 12 volts battery and shorting it for welding 😂
i guess the pcb"s got the april fools on you.
no such thing as a failed experiment. negative results are just as important as positive ones. thanks for posting.
A person who never made a mistake never tried anything new- Albert Einstein
Electronics is purely mathematics, not trying and making mistakes -procedure. You can predict pretty well just by looking the schematics that does it work or not.
You didn't fail. You learned. Thanks for sharing
create a welder from old microwave transformers use 2 of them in series
Vansh Dhir he tried that originally in the video
The way you present your project is very good and you make it fun ti watch no matter of the spoiler from the beggining. Keep up great work Great Scott!
I watch every video of yours and I love how you describe things. But your soldering skills are not that professional. 😜
I really like that you show failed projects. In real life, engineering isn't always 100% success on the first try. Thanks!
...With a functioning project hopefully ....😅😅😅😂🤘✌
OMG, there is no video that cant show the Arduino board! This is a sign from God! I started 2 weeks ago with the arduino. Its amazing!
And why you do not use lipo batteries instead of capacitors?
They cannot discharge fast enough
Alberto cornejo Ave actually did that though he used high power 18650 cells to do that and he was successful
banano banana i use a turnigy nano-tech lipo battery and it works perfect 🤔, but i know that maybe other kind of lipo batteries can not support it.
Laharl Krichevskoy yes, i break a 8000mah turnigy nano-tech cell one month later 😫
Because, even though super capacitors have a "super" in their name, the amount of energy stored is big only relative to its not-super relatives. LiPo, or LiIon, or even any alkaline battery has far more energy stored than even super capacitors.
I love your voiceovers. Soothing and nerdy. Don't care if you failed, your video was still a good watch. :)
you gave up too quickly this time my friend
always a pleasure Scott, even if you sometimes fail. prototyping is an under appreciated effort.
This is really not a video to show, at least go more into the detail process on how you designed the gate drive wrong and also the fixing process. Otherwise this is useless, its always easier to buy something, but DIY is the way to go if you want to learn something.
Thanks for sharing even the failures. This is how we all learn collectively - from our own, and each others' mistakes!
eeeheheehehe April foolss
Es ist super, dass du auch die fails hochlädst!
Lol "I will fail horribly" .... Only the best projects start this way!! Awesome content!
Your wide skill range is what I am opting to achieve one day. Incredible. Even if it didn't work.
April Fools joke or not.
I honestly do appreciate that you both show your success and failures here on UA-cam.
Both with incorrect components PCB layouts to missing circuit parts.
It's good to learn from failures... and fun to watch yours. 😆
It sucks that this project didn't work so spectacularly for you. :( But at the same time though there's still tons to learn from stuff like this! Like how you pointed out that the MOSFETs needed a proper reference voltage for them to be able to properly switch on, and so forth. :)
I love that you also show what does not work. Good job:) Every video is interesting:)
Super capacitors blow my mind. When I was a kid, I read in an electronics textbook that 1 Farad capacitors were impossible and, if they were, would be the size of a house... and here you are with a 100 F super capacitor in your hand.
Makes sense to just buy after all those troubles of troubleshooting. Very nice presentation!
I learn more from the things that don't work, so this is a valuable video. Danke.
To whomsoever it may concern. Many thanks for makung such VDO's to make us understand in a very simple language & method. "Appreciate" 👏👏 keep it up 👍
He is being so genuine! Great, Greatscott
wow. gotta admire his will power.
Every successful project undergoes a lot of work, which is most often a complete failure. Having the courage to try again and again, makes it then a masterpiece. And, who never has put a soldering iron in their hand, are easy to criticize other people 😊
I like your videos before even watching them because they are always awesome.
Thanks brother; I learn a lot.taking of spot welders;hoping to see battery welder .sorry for poor English.my english is not good. Always respect to u;for everything u have done for us.
Excellent Video GreatScott! It's nice to see that even yourself has genuine failures and you're not afraid to share them so we can all learn! I will continue to support you through patreon! :)
We did something similar at home with the Mic transformer. 3 turns of 25mm^2 cable on the secondary, gave us ~3v 1200amps. Then used a broken toaster circuit (element snapped), as the timer. Swapped the electromagnet with a 240v solid-state relay and a few caps to reduce the "toasting" time frame. Together with a foot switch and doneski ;) the perfect fix for replacing old power tool battery packs
Can you share more on why it would have shorted the main power supply? What was the problem and why could you not fix it easily?
You have the same issue I do, you use too much solder. I was however amazed how easily you created a PCB and had it sent to a company to be created.. bravo
I'm not sure if this has been mentioned before, but how about using SCR's instead of mosfets? From my limited knowledge of googling and looking up on wikipedia it supports forward blocking, forward conducting and reverse blocking modes.
36v is needed to break down the air enough to create a sufficent arc although 24v would work just know you need like 90 amps. Im in welding school and i hope this basic info helps your welding projects because id love to see you make a working one
even when you fail, you rock! cheers for making these videos
Finally somebody that doesnt joke on April 1st. I hate all the damn pranks.
Scott vs spot welding to be continued :D all in to Scott I know spot welding can not win the battle :D great video brother
Been watching your channel years but currently trying to build a similar thing so using this for reference and i just have to say i miss this opening scene
I'm sorry to see that your project failed. too bad. But that is the thing that makes us better engineers. check for details that we missed in our last project. I enjoy watching your videos. Thanks for sharing.
The only answer I found is to put a p-channel mosfet between cap+ and VCC that opens at the same time as the charging mosfet. And one question, why did you put P3? It's a pad that would connect directly cap- to GND, so you would have no control to charge the capacitors, right?
Hey. I've been soldering a lot of cells lately, and I think I found pretty good method to do it, without heating cells too much.
I used transformer soldering iron with tip was partly damaged which made it work.
What you need is a tip with very thick copper bars, that are connected by a thin wire.
Thin wire gets hot enough to melt solder, and then the current flows directly through it, melting it much quicker, and getting it to stick everywhere.
I've soldered a good amoung of cells like this with pretty good results, and the contact area is quite high as well.
if that small welder got to working, it could be used to connect 18650s (via nickel strip) together, right? thanks again
Use a separate power supply for the control circuit so that the drive voltage to the switching FETS remains above 6-7V as the supercapacitors discharge AND voltage drops won't kill your Fets. You could also use a diode and a large decoupling capacitor going to the control circuit.
You can just use a solenoid circuit to short a car battery accross the welding tips. Super simple and works great. There are a few UA-cam videos using this method.
Send me your number, whatapp number, or any social media u are
Great video ! You're my (very creative) hero ! I'm just in the process of... buying or DIY of a spot welder. I'd prefer DIY since I have a lot of gear lying around.... However, buying is of course much easier but it doesn't give you the same satisfaction !
Congratz !
I maybe wrong but isn't of couple of relays , transistor and diac could theoretically get the job done?
I mean all we need to do is to charge the capacitor and avoid overcharging.
The most important for a super capacitor welder is the charging circuit. Simply charging them in series is dangerous, especially for those bulky ultracapacitors.
if we use a separate isolated power supply for charging the capacitor and uses switches like relay
We can make this work right
actually I am new to electronics just trying to improve my debugging skills
I wonder if a beefed up electric fly swatter can do the job. I remember metal parts sometimes sticking to fly swatter.
If you succeded on the first try how would the prices compare? Would the DIY working one be worth it over the bought one? How efficient would they be comparatively?
Hey Great Scott!
Thanks for another fantastic video!
Do you think you could go into detail as to why this DIY wielder did not work?
From what I can understand you needed the Mosfet Driver IC's to have the same ground potential as the Mosfets they were driving,
and I understand how this would cause them not to turn on.
However how does changing the ground point of the mosfet to be the same as the drive cause a short?
I'm sure there is a reason, I just can't find it.
P.S Love your vids!