What the hell, literally less than 20 hours ago I was scouring the internet for a good guide to short circuit protection. GreatScott couldn't be more perfect.
This is EXACTLY what I was looking for and you even addressed the infinite loop question I had. I haven't done electronics in 10+ years and my brother wanted me to make him something. Turns out I've forgotten everything and it was very daunting till I came across your channel. Thank you very much!
Wow, dude... I understood that whole schematic as you described it -- that's like the most complicated schematic I think I've ever been able to understand! -- You did really well breaking out each component and explaining it separately. -- Thanks, man! :-)
Yes, I most certainly enjoyed the video. A year from now I'll be able to design my own circuits thanks to your instruction. I'll just toss in a comparator over here to turn that off; ... right off the top of my head. Thanks, I watch your videos almost daily.
For even more simplicity, you can use a single channel power switch IC to provide a fixed voltage overcurrent and reverse current protection. For 500mA or 1A, I recommend the STMPS21X1.
the last bit about using a fix resistor i believe if the supply voltage changes it will still effect a resistor unlike some zener or regulator please correct me if i am wrong
Thomas Cruz LM4040. Somebody is playing with the good stuff.... The challenge for this circuit is the need for an extra reference voltage. For the scavengers and poor boys like myself, a simple TL431 will work. They can be found on almost every AC to DC switching type power supply made for consumer goods :-)
Nice work. You could have connected the opamp power to the relay output to get a cut off latch. The second relay can be eliminated. For the reference voltage, you can use a 4007.
I liked the video right away, this is a very nice project although, in my opinion, it ended up being a little too big for its purpose. But it is a very nice introduction on this topic and could be used to compare with a purpose built IC, like the LTC436x series.
yeah there's purpose built IC almost for everything now! But well this is a cool _weekend project_ that some might be able to built with parts that already they have.... and a good middle level electronics to learn from! (which makes a good UA-cam content... I'm an electronic engineer and it's good to remember all the applications of the basic stuff!)
if you used a mosfet instead of the relay and let it oscillate freely then filter the output with a couple of a by-pass capacitor you could have made current limiting circuit
@@jamilhneini1002 sorry but no, P-Channel MOSFET FDWS9509L -F085 has only 8mOhm Rdson and can handle 65A and the price is $1.46 USD while this relay is 50mOhm contact resistance for 1A with a price of $1.34 EUR , not mentioning that the MOSFET can shutdown the rail lightening fast compared with a relay, and the MOSFET is way smaller than the relay, latching mechanism can be added by using a diode as feedback in the comparator so no problem there.
Besides, due to teensy mikes and speakers, it would be a little 'snap'. Not the big firecracker-esque POP with lots of room reverberation you'd hear in person. Foley artists go to a lot of trouble to make gunfire sound like 'gunfire'.
Your videos are always high quality and very informative. I was looking for a relatively simple circuit for over current protection and viola, you just happened to post a video on it! Keep on posting these awesome videos! :)
LM358 tends to work well on Vicm (common-mode input voltage) close to its negative supply. Vicm on circuit in this video close to its positive supply, so other type op-amps such as LF353 or LF412 or TL072 or TL082 more fit to this purpose. excellent explanation, excellent video. cheers from Indonesia
I'm surprised the circuit actually worked. The datasheet for the LM358 states the maximum input common mode voltage is 1.5V less than Vcc, which he clearly wasn't meeting here.
I can't afford to help you with your channel, However, I didn't want to thank you for the information. You have encouraged me with your many projects, even though many times I have no clue to what you are talking about, but this will come in time... As I spend more time doing electronics, being self-taught is always a long process... Learning how to code Apps, at the same time, and many other projects... Anyway, thanks again... Keep up the good Work and May GOD Bless you and yours... AMEN...
I absolutely love this!! I love all your videos! Although I have a suggestion to make for you. When you record your hand written diagrams, could you stop-down your aperture so more of your diagram is in focus? I'm not sure if you so this on purpose to draw our attention to certain areas, but I would find it helpful if your diagrams weren't so blurry in areas
This was actually the kind of video i was waiting for. About 3 days ago iv been working on a short circuit protection circuit, though i didnt use a relay. Iv been using thermal fuses, which is kinda crude, but you get the idea. Great video though 👍
THANK YOU i tried to make this in my diy power supply but it it worked on bread board, but not in a PCB i tried to find video's about a simular circuit but nobody made one thanks for fixing my problem
Hello I find your chosen topics and expressions very successful. Thank you very much for your contribution to the world of electronics. I take advantage of your knowledge. I have a question: Does the Vcc voltage +5V? Or +12V?
I was looking in a way to feed a shunt-resistor voltage drop to my arduino, but i'm using a very small resistor value and the precision was way too low... This sure will be handy
You have to build 2 of them because if you make the protection circuit you need to protect that circuit to prevent high current flows if you make a mistake in the protection circuit..
hi i would have used the second contact to break the circuit between the coil and the top of q2 and the push button across the contact that would prevent the button allowing full current while it is held (5:14)
This is fine for low current. But when you get over 5A, using relay contacts gets iffy, unless you have a rather beefy relay. I'd like to see this example pushed a bit and instead of a relay, a power MOSFET P channel in it's place.
I think improving the circuit design can be achieved with a low power adjustable voltage regulator, and adding a half bridge rectifier at the differential OpAmp output to make it work with AC.
Reminds me of what i tried to create recently with discrete components: Low voltage high current stepdown converter. Didn't work as intended....first the OpAmp and the Mosfet kept ringing, after a small redesign i would have needed a mosfet driver and the last attempt was simply too bulky for the projects i wanted to use it in. maybe i should just get a finished chip for that. Now the next thing is a switchcap power-controller for a 12V PC fan. And DTFM data transmission using arduinos.
Youre videos are really, really awesome mate. Thank you very much for sharing so much knowledge and advice, it's really helpful to us hobbyists, and i for one am very grateful! Would it be difficult to ad a display for the set voltage and current on this circuit?
I really like your videos. You have excellent subject matter and peerless editing. I want to suggest something if I could. Sometimes the narration is difficult to understand. I would love to offer my voice to some of these videos. I have done voiceover and narration in the past and could submit finished soundtracks for you to add whatever other audio you wish. Just a suggestion. Again, I love your content. Keep it up!
Dear Scott, I want to know why in the video every time when you reset the circuit, you press the push button twice? Why not only one press can reset the circuit?
please make a video about how to boost wifi signal . and i have a question. i have a phone that it has a quick charger. (it supports both normal charger and quick charger but quick chargers can switch between 9 volts and 5 volts) how the charger switches between 9 volts and 5 volts and how the phone senses that charger is 5 volts or 9 volts? sorry for my grammar problems
Arya .s Get a new phone (Redmi 3s is known to me) with better wifi chipset or get a wifi range booster/wifi reapeter. Or use a secondary wifi router to create WDS or wifi mesh (dont steal wifi tho😛). There is some kind of proprietary microcontroller/asic in the Qualcomm Quick-chargers which communicate with mobile using USB data pins and determine the charging voltage & current. like 5v 500mA-2A or 9v 2A.
Yeah take an old router and you can put aftermarket software on it. I forget the name but it allows you to use it as a repeater and you only need a power source
Melody I use old pentium 4 laptop (free☺) on Windows 7 as a wifi repeater. And you dont need any extra software to use a wifi router as a reapeter. Wifi reapeter function is integrated in most firmware of wifi routers. Even as low as 12$.
I was proposing if you could try out one using a transitor latch and differential amplifier. Like the differential amplifier circuit measurement the voltage drop across a shunt resistance and I output is connected to a comparator which trigger a transistor latch when the voltage drop across the shunt exceeds a certain value. Like instead of using the relay you use a transistor latch
man legit said "i drew a more professional circuit schematic" after drawing the cleanest looking hand-drawn schematic
What the hell, literally less than 20 hours ago I was scouring the internet for a good guide to short circuit protection. GreatScott couldn't be more perfect.
what if the diy go wrong and create a shot circuit
Electroboom needs this, considering the amount of wrongly polarized capacitors.
GIMME DA METAAAA
GIMME DA SCOPE!!!
LOL, True that :D
xD
you damn right
Oh come on, I guess you don't want to undermine the meaning of his life by some overcurrent protection circuit :)
This is EXACTLY what I was looking for and you even addressed the infinite loop question I had. I haven't done electronics in 10+ years and my brother wanted me to make him something. Turns out I've forgotten everything and it was very daunting till I came across your channel. Thank you very much!
Wow, dude... I understood that whole schematic as you described it -- that's like the most complicated schematic I think I've ever been able to understand! -- You did really well breaking out each component and explaining it separately. -- Thanks, man! :-)
Its pleasure to watch the way you briefly describe projects .................
You just like drawing circuits don't you?
Good thing you're good at it. 👍
Yes, I most certainly enjoyed the video. A year from now I'll be able to design my own circuits thanks to your instruction. I'll just toss in a comparator over here to turn that off; ... right off the top of my head.
Thanks, I watch your videos almost daily.
What i read:
DIY Short Circuit
Ok.
That escalated quickly.
Oh, you're one of them? Well we mustn't judge.....
Skyfighter64 o
selective reading
Mehdi joined the chat.
Your writing is so perfect! I don't know how you do it!
Love your stuff! Plus, no one could ever complain they can't read your writing either! Thank you.
How come I have never come across such a great channel all my years of youtubing till year 2020
You are awesome sir
Your schematic drawing and hand writing are awesome
Really great video. I like your Quality and the Ideas. I think I will recreate it.
ToDoList That s right
ToDoList I agree
Awesome :-)
On YT it is called "Inspiration" and isn't it fun when a dozen channels are INSPIRED to do the same video in the same day?
John Possum I don't want to upload this. I thing that I Create it only for my own
I literally never build anything GreatScott makes, since I never have the right parts, but I love knowing the information is there when I need it :)
Am i the only one who doesnot undrstand anything but watches it
Edit : i also wanted to say his videos are interesting even tho i dont understand
No, I feel lost pretty early on the video but still watch the whole thing.
i too didnt understand when i was in college later i realised the same requirement then same video understood
nope
Me 2 !!!
Keep watching then mate, the more you watch and take note the more you will come to know
you make the best simple, clean and well explained tutorials
For even more simplicity, you can use a single channel power switch IC to provide a fixed voltage overcurrent and reverse current protection. For 500mA or 1A, I recommend the STMPS21X1.
Thanks buddy for a simple protection circuit👌👌
You're welcome :-)
the last bit about using a fix resistor i believe if the supply voltage changes it will still effect a resistor unlike some zener or regulator please correct me if i am wrong
Šƫőȓɱ КІЛջ
He said "fixed voltage." ;-)
oh...... thanks
Thomas Cruz
LM4040. Somebody is playing with the good stuff.... The challenge for this circuit is the need for an extra reference voltage. For the scavengers and poor boys like myself, a simple TL431 will work. They can be found on almost every AC to DC switching type power supply made for consumer goods :-)
Nice work. You could have connected the opamp power to the relay output to get a cut off latch. The second relay can be eliminated. For the reference voltage, you can use a 4007.
I liked the video right away, this is a very nice project although, in my opinion, it ended up being a little too big for its purpose. But it is a very nice introduction on this topic and could be used to compare with a purpose built IC, like the LTC436x series.
Looks like a great IC. I will have a look at it.
yeah there's purpose built IC almost for everything now!
But well this is a cool _weekend project_ that some might be able to built with parts that already they have.... and a good middle level electronics to learn from! (which makes a good UA-cam content... I'm an electronic engineer and it's good to remember all the applications of the basic stuff!)
GreatScott! Hola soy.aficionado a la electronica...si pusieras estos videos tambien en ESPAÑOL serias el mejor canal de youtube
As usual Scott is Great in his video. I love the detailed explanation.
if you used a mosfet instead of the relay and let it oscillate freely then filter the output with a couple of a by-pass capacitor you could have made current limiting circuit
Yeah but relay has lower power loss
Jamil Hneini but relay can't oscillate fast enough for the current limiter
Camilo Mason I don't think you need it to oscillate right? Just close it when there's no overcurrent and open it when there's no overcurrent
@@jamilhneini1002 sorry but no, P-Channel MOSFET FDWS9509L
-F085 has only 8mOhm Rdson and can handle 65A and the price is $1.46 USD while this relay is 50mOhm contact resistance for 1A with a price of $1.34 EUR , not mentioning that the MOSFET can shutdown the rail lightening fast compared with a relay, and the MOSFET is way smaller than the relay, latching mechanism can be added by using a diode as feedback in the comparator so no problem there.
Why didn't you let us hear the capacitor exploding ?
I often listen to music while recording. So the explosion was not useable.
Thanks for replying and great video as usual.
GreatScott! Q&A what music do you like ? xD
CoHxBlackWebster
Beatles!
Besides, due to teensy mikes and speakers, it would be a little 'snap'. Not the big firecracker-esque POP with lots of room reverberation you'd hear in person. Foley artists go to a lot of trouble to make gunfire sound like 'gunfire'.
Simply and effective design, i am thinking about building my own copy. Thanks for sharing.
Something about that capacitor fluff hitting that meter in the intro makes me appreciate the quality of your camera work.
Great video. Thank you for showing and explaining how to do this. This is one I will actually build.
Your videos are always high quality and very informative. I was looking for a relatively simple circuit for over current protection and viola, you just happened to post a video on it! Keep on posting these awesome videos! :)
Nice circuit, perfect DIY solution and easy op-amp introduction.
I really enjoy your videos. The way u demonstrates it with pen and paper. Loved it! keep posting such lovelies..
60 years ago you would have been a STAR at Tektronix heading up the "schematic documentation branch"... and even more legendary now :)
what about making a video for variable current limiting circuit like lab bench power supply
Food Gamer فوود جيمر
Already done. Check HACKED!
Emmsey Square2
Seen😁
he has the finest hand draw circuit
This video seemed to make a lot more sense than other videos
LM358 tends to work well on Vicm (common-mode input voltage) close to its negative supply. Vicm on circuit in this video close to its positive supply, so other type op-amps such as LF353 or LF412 or TL072 or TL082 more fit to this purpose.
excellent explanation, excellent video.
cheers from Indonesia
I'm surprised the circuit actually worked. The datasheet for the LM358 states the maximum input common mode voltage is 1.5V less than Vcc, which he clearly wasn't meeting here.
i got my variable lab power supply for 40 bucks from china. they arent that expensive. everyone should invest that money. they are so useful
Congratulation!...your explanation is easy to understand.
I can finally follow these videos now
You destroyed a breadboard for us. Much respect!!
Thanks Scott now no one will be afraid when i turn on my circuits
That was my intention ;-)
GreatScott! Love you Scott👍😊 your videos made me choose electronics in college
Awesome :-)
Is this only me that watching this as a 11 years old kid and confused? But subscribed to this channel and always watch the video?
I can't afford to help you with your channel, However, I didn't want to thank you for the information. You have encouraged me with your many projects, even though many times I have no clue to what you are talking about, but this will come in time... As I spend more time doing electronics, being self-taught is always a long process... Learning how to code Apps, at the same time, and many other projects... Anyway, thanks again... Keep up the good Work and May GOD Bless you and yours... AMEN...
This is great in combination with my DIY power supply. I think I'd also add a buzzer so when there's short circuit it would notify me with a sound
I absolutely love this!! I love all your videos! Although I have a suggestion to make for you. When you record your hand written diagrams, could you stop-down your aperture so more of your diagram is in focus? I'm not sure if you so this on purpose to draw our attention to certain areas, but I would find it helpful if your diagrams weren't so blurry in areas
All I hear is stuff I don't understand but I still watched the whole video because it's great Scott 😉 dun dun tsss
All starts with a bang. Nice touch.
Wow really nice circuit! Thanks Scott!
Best GREATSCOTT vid ever. Thank you bro.
This schematic was incredibly well exlained! I admire your designs and detailed commentary.
Freundliche grüße aus mexiko!!
OMG Scott, your drawing skills are amazing!
This was actually the kind of video i was waiting for. About 3 days ago iv been working on a short circuit protection circuit, though i didnt use a relay. Iv been using thermal fuses, which is kinda crude, but you get the idea. Great video though 👍
THANK YOU i tried to make this in my diy power supply but it it worked on bread board, but not in a PCB
i tried to find video's about a simular circuit but nobody made one
thanks for fixing my problem
Supersložité. Pořídím si regulovaný zdroj a napětí zvyšuji pomalu. V případě zkratu protestuje Ametr.
1:01 : "lets get started" (pop..) 🤣
Great project man !!!
Brazil here!!
Thank you.
I can see this being a useful addition to a diy bench power supply like an ATX psu along with a display to show the cut off values.
:)
Hello
I find your chosen topics and expressions very successful. Thank you very much for your contribution to the world of electronics. I take advantage of your knowledge.
I have a question: Does the Vcc voltage +5V? Or +12V?
Very cool video, I appreciate the time that must go into getting each shot of you editing your drawn schematic; great B-roll!
I was looking in a way to feed a shunt-resistor voltage drop to my arduino, but i'm using a very small resistor value and the precision was way too low... This sure will be handy
Great Scott's components explode in a more elegant fashion than ElectroBOOM's. Not sure if it's a good thing, though.
Thank God Mehdi did never make a 400V 220uF cap explode (as far as I know).
@@waltercomunello121 i did inside of my wall
i liked that capacitors explosion
Congratulation 600k subs
Thanks
You have to build 2 of them because if you make the protection circuit you need to protect that circuit to prevent high current flows if you make a mistake in the protection circuit..
I've got few neanderthal genes. I see caps blowing up. I click like.
Awesome! You always do excellent projects and very well explained. Thank you.
bro wow love watching your projects
hi i would have used the second contact to break the circuit between the coil and the top of q2 and the push button across the contact that would prevent the button allowing full current while it is held (5:14)
Great video, and it popped up on my feed at just the right time.
This is fine for low current. But when you get over 5A, using relay contacts gets iffy, unless you have a rather beefy relay. I'd like to see this example pushed a bit and instead of a relay, a power MOSFET P channel in it's place.
you could probably use a normally open Momentary push switch between the transistor base and ground instead of the blue Colored bistable switch
I think improving the circuit design can be achieved with a low power adjustable voltage regulator, and adding a half bridge rectifier at the differential OpAmp output to make it work with AC.
Half bridge would explode in current got to big
Burnt up ICs and exploding capacitors, Great Scott!
Congrats man, it's very useful!
Wow. I've been looking for that circuit ! Thank you mate !
Reminds me of what i tried to create recently with discrete components:
Low voltage high current stepdown converter.
Didn't work as intended....first the OpAmp and the Mosfet kept ringing, after a small redesign i would have needed a mosfet driver and the last attempt was simply too bulky for the projects i wanted to use it in.
maybe i should just get a finished chip for that.
Now the next thing is a switchcap power-controller for a 12V PC fan.
And DTFM data transmission using arduinos.
Incredibly awesome project👍 thank u for the idea
You can turn the bistable switch into a push button by opening it and removing the little spring inside :D
Great a protection CIRCUIT for failing at soldering circuits👌
My brain explode trying to follow this video
As always ty for your time and knowledge my friend.
Youre videos are really, really awesome mate. Thank you very much for sharing so much knowledge and advice, it's really helpful to us hobbyists, and i for one am very grateful! Would it be difficult to ad a display for the set voltage and current on this circuit?
your're such a genieus scott ! keep going homie ..
This is a great video. You explained it very well. Thanks a lot!
pretty nice you entertain me every new time 😊 really good channel
Scott..
Thou art indeed great....
You are right. Electric boom need this
Well done! Obviously, for large inrush current, a resistor is not the way to go, rather a thermistor.
please make a video on building a simple over discharge protection circuit for a lithium-ion battery, it would really help me out.
dude this is soon CCCCOOOOOOOOLLLLLL
I think that I will use this in DIY underwater thruster pack
great vid
This is so cool! Thanks Scott this will be very handy for me later down the road. :)
this is a really good useful thing , I really liked it
Your vídeos make love the electronica
I really like your videos. You have excellent subject matter and peerless editing. I want to suggest something if I could. Sometimes the narration is difficult to understand. I would love to offer my voice to some of these videos. I have done voiceover and narration in the past and could submit finished soundtracks for you to add whatever other audio you wish. Just a suggestion. Again, I love your content. Keep it up!
Dear Scott, I want to know why in the video every time when you reset the circuit, you press the push button twice? Why not only one press can reset the circuit?
Very usefull for my projects and thanz to informed us to the developing paths in practicle. Thanz lot!!
please make a video about how to boost wifi signal .
and i have a question. i have a phone that it has a quick charger. (it supports both normal charger and quick charger but quick chargers can switch between 9 volts and 5 volts) how the charger switches between 9 volts and 5 volts and how the phone senses that charger is 5 volts or 9 volts?
sorry for my grammar problems
Arya .s Get a new phone (Redmi 3s is known to me) with better wifi chipset or get a wifi range booster/wifi reapeter. Or use a secondary wifi router to create WDS or wifi mesh
(dont steal wifi tho😛). There is some kind of proprietary microcontroller/asic in the Qualcomm Quick-chargers which communicate with mobile using USB data pins and determine the charging voltage & current. like 5v 500mA-2A or 9v 2A.
Yeah take an old router and you can put aftermarket software on it. I forget the name but it allows you to use it as a repeater and you only need a power source
Melody I use old pentium 4 laptop (free☺) on Windows 7 as a wifi repeater. And you dont need any extra software to use a wifi router as a reapeter. Wifi reapeter function is integrated in most firmware of wifi routers. Even as low as 12$.
Melody Its DD-WRT. Here you go my boy- www.dd-wrt.com/site/index
Dont forget to check the supported router list.
thanks for everybody for helping
great demo amigo! for the rest of us useless cat brainers... we still gotta use the humble fuse
I was proposing if you could try out one using a transitor latch and differential amplifier.
Like the differential amplifier circuit measurement the voltage drop across a shunt resistance and I output is connected to a comparator which trigger a transistor latch when the voltage drop across the shunt exceeds a certain value.
Like instead of using the relay you use a transistor latch
Very nice.
Scott! You are great!