thanks for the helpful video and i love how the board is a transparent layer between the speaker and the audience and the video is mirrored so the audience can read what's written
Thank you so much for this information! After far too much searching, it's bloody refreshing to finally find someone who knows WTF they're talking about, and even better, smart enough to explain it! Thanks again, cheers!
Ok I have 12 2400uf 360vdc pulse capacitors in series . I’m building an exploding bridge wire circuit. I plan to change the caps to 4kv and detonate the bridge wire. Whatever voltage is left in the caps I plan on discharging in seconds for safety reasons. My question is can you discharge 4000 vdc with a 4K ohm 10watt wire would powder resistor safely in seconds ? Any input is appreciated.
Hello If Ive calculated bleed resistance,can I use smaller resistance than calculated-hence cap discharge time will be quicker.Can I have resistor to get-lets say-10 seconds discharge for 550v caps in valve amp I mean is it safe for capacitors?
Hi. I have a 50V, 60,000uF capacitor, so is this the correct way to write the equation: R=12/0.06? I'm using the capacitor in a flux core welder in parallel with a full bridge rectifier in an effort to get a steady DC voltage. I want the least amount of interference with the voltage and current from the resistor, but I want the resistor to bleed the capacitor within 60 sec after I power off the welder. Also, is it correct that the greater the value of the resistor, the less it will interfere with the voltage and current? Thank you for the great tutorial.
Hobby guy here. I'd like to work on minor circuit repairs, but have held back based on the advice that caps are dangerous until discharged. I was afraid to work on circuits due to this. Thank you for your informative video. My one question is, you are talking about the time limit. At 1:10 you said that for under 750v you "have to discharge within a minute" (and 5 minutes for >750v). Please clarify: what happens if you don't? i.e. What changes, and what do I do if I don't meet that amount of time? Or are you saying it takes a minute to fully discharge? Am I completely out of context? Maybe you're saying a built circuit must do this within the allotted time?
If I'm not mistaken, I think he is specifying what the law says. For hobby electronics it shouldn't matter, its up to you how fast you'd like to discharge.
your dranage charge is in 5 time constants so within that 1min for under 750 there is 12s and each 12s will be a persentage of the max voltage that needs to be drained of you dont wait the full 60s you can get shocked depending on at what percentage is left to be drained
@@ZackHartle omg invert the hole footage, humans don't look any different inverted! brilliantly done!!! Also your content was fantastic, it nice to finally get some content that actually applies to me as a canadian electrical engineer. Thank you for the information!
Hello! How to discharge an output charged capacitor from an IC? Is there any specific circuit diagram for that? Please someone help me ASAP. I am running out of time for a CONFERENCE!
@@ZackHartle yes. i'm converting an ac welder to dc, with a bridge rectifier and a smoothing capacitor. i was recommended to use 100 farad capacitor at around 50v. i thought 30f at 63v would work. the design of the welder has the tip always connected to power, so i need to be able to drain the capacitance energy for safety.
@@ZackHartle i wasn't sure about my math. it didn't seem right to me. i only have a rudimentary understanding of electronics. most of my electrical experience is in automotive and residential circuits and wiring. i have one of those cheap harbor freight 90 amp flux core welders, and thought ac/dc conversion would be a good beginner project to learn from. i understand the components needed for the application, just not how to calculate the correct values required to have it function safely. that's why i watched your vid. i could just put a rectifier in the circuit and have it operate, but i'm also trying to improve the welder's function as well as learn.
@@ZackHartle well, you did answer my question, so that was a great help, thank you. teaching yourself anything is an adventure, but it's better than simply remaining ignorant. i try to learn something new every day, even if it is only that i have much more to learn.
@@tinkertom3683 So keep in mind the 60 Mohm would be the maximum size. Having a smaller resistor would cause it to discharge fast, due to higher current. That would be no problem at all.
@@ZackHartle I do apologise I'm a total novice 😅 but wouldn't it be more useful to know what the minimum is? And how we would calculate so its fast, doesn't damage the cap and doesn't melt or blow the resistor 🤔
@@tinkertom3683 That's all. So this video is just about what the Canadian code requires to achieve minimum safety. I would imagine that manufacturers would have recommendations for their products in terms of sizing
thanks for the helpful video and i love how the board is a transparent layer between the speaker and the audience and the video is mirrored so the audience can read what's written
Thank you so much for this information! After far too much searching, it's bloody refreshing to finally find someone who knows WTF they're talking about, and even better, smart enough to explain it! Thanks again, cheers!
THANK YOU. My mouse hand went numb as I searched for this basic information.
Please keep making videos for lab and everything so helpful please!
Ok I have 12 2400uf 360vdc pulse capacitors in series . I’m building an exploding bridge wire circuit. I plan to change the caps to 4kv and detonate the bridge wire. Whatever voltage is left in the caps I plan on discharging in seconds for safety reasons. My question is can you discharge 4000 vdc with a 4K ohm 10watt wire would powder resistor safely in seconds ? Any input is appreciated.
Hello
If Ive calculated bleed resistance,can I use smaller resistance than calculated-hence cap discharge time will be quicker.Can I have resistor to get-lets say-10 seconds discharge for 550v caps in valve amp
I mean is it safe for capacitors?
Hi. I have a 50V, 60,000uF capacitor, so is this the correct way to write the equation: R=12/0.06? I'm using the capacitor in a flux core welder in parallel with a full bridge rectifier in an effort to get a steady DC voltage. I want the least amount of interference with the voltage and current from the resistor, but I want the resistor to bleed the capacitor within 60 sec after I power off the welder. Also, is it correct that the greater the value of the resistor, the less it will interfere with the voltage and current? Thank you for the great tutorial.
Understand.
Cheers
if i want discharge 35V 1000uf, can i use 25W 200ohm resistor? or 5W 51ohm? 1/4W 100k ohm?
great video, but how I calculate the resistor power dissipation (watts)? Here´s an example, 4700 uF and 300V.
Hobby guy here. I'd like to work on minor circuit repairs, but have held back based on the advice that caps are dangerous until discharged. I was afraid to work on circuits due to this. Thank you for your informative video.
My one question is, you are talking about the time limit. At 1:10 you said that for under 750v you "have to discharge within a minute" (and 5 minutes for >750v). Please clarify: what happens if you don't? i.e. What changes, and what do I do if I don't meet that amount of time?
Or are you saying it takes a minute to fully discharge?
Am I completely out of context? Maybe you're saying a built circuit must do this within the allotted time?
If I'm not mistaken, I think he is specifying what the law says. For hobby electronics it shouldn't matter, its up to you how fast you'd like to discharge.
your dranage charge is in 5 time constants so within that 1min for under 750 there is 12s and each 12s will be a persentage of the max voltage that needs to be drained of you dont wait the full 60s you can get shocked depending on at what percentage is left to be drained
how are you writing inverted? that is truly impressive!
@@ZackHartle omg invert the hole footage, humans don't look any different inverted! brilliantly done!!! Also your content was fantastic, it nice to finally get some content that actually applies to me as a canadian electrical engineer. Thank you for the information!
He wrote on the mirror
we can apply the same formula to see how much time require for a capacitor to be charged ?
Yes
Hello! How to discharge an output charged capacitor from an IC? Is there any specific circuit diagram for that? Please someone help me ASAP. I am running out of time for a CONFERENCE!
I'm not sure I fully understand the question.
I give a 100uf capacitor and volt 100 how many resistance valu find place help
Thanks, man.
Nice Video
What does 26.222 apply to? Is that AHRI standards?
I discerned from his response to another comment that he's talking about Canadian code requirements.
Tq
so, i have 63v 30,000mfd capacitance to discharge. that's a 4000k ohm resistor?
@@ZackHartle yes. i'm converting an ac welder to dc, with a bridge rectifier and a smoothing capacitor. i was recommended to use 100 farad capacitor at around 50v. i thought 30f at 63v would work. the design of the welder has the tip always connected to power, so i need to be able to drain the capacitance energy for safety.
@@ZackHartle i wasn't sure about my math. it didn't seem right to me. i only have a rudimentary understanding of electronics. most of my electrical experience is in automotive and residential circuits and wiring. i have one of those cheap harbor freight 90 amp flux core welders, and thought ac/dc conversion would be a good beginner project to learn from. i understand the components needed for the application, just not how to calculate the correct values required to have it function safely. that's why i watched your vid. i could just put a rectifier in the circuit and have it operate, but i'm also trying to improve the welder's function as well as learn.
@@ZackHartle well, you did answer my question, so that was a great help, thank you. teaching yourself anything is an adventure, but it's better than simply remaining ignorant. i try to learn something new every day, even if it is only that i have much more to learn.
This formul use any capacitor
So if I have a 2100v 1 microfarad = 60 mega ohm resistor?
Yep that's correct.
@@ZackHartle Thank you 😊 it does seem a lot though for a microwave capacitor these are usually fitted with a 10 mega ohms resistor from the factory.
@@tinkertom3683 So keep in mind the 60 Mohm would be the maximum size. Having a smaller resistor would cause it to discharge fast, due to higher current. That would be no problem at all.
@@ZackHartle I do apologise I'm a total novice 😅 but wouldn't it be more useful to know what the minimum is? And how we would calculate so its fast, doesn't damage the cap and doesn't melt or blow the resistor 🤔
@@tinkertom3683 That's all. So this video is just about what the Canadian code requires to achieve minimum safety. I would imagine that manufacturers would have recommendations for their products in terms of sizing
Bruv are you writing backwards ?