How to generate REALLY HIGH VOLTAGES using just 9 Volts...
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- Опубликовано: 9 сен 2024
- In this video I take the output from my high voltage switched mode power supply that's powered from a 9 Volt source and couple the output to a voltage multiplier circuit. This generates a high voltage DC signal which I use to charge up a Marx generator....the result is scary, and it breaks my bench power supply :(
Check out this video for more details on how the voltage multiplier works: ruclips.net/video/4alV5LzHLE4/видео.htmlsi=Xc_Y2O8WYmTmypQf
yeah, it is advisable to have a pair of Zener diodes across the output of your power supply when playing with high voltage stuff to help reduce voltage spikes. naturally, Zener values higher than your operating voltage ( pointing towards each other in series and parallell with the output ) Back EMF travels far when voltage is high. The spike can still travel to ground and cause trouble if the power supply is not isolated with a transformer or something like that. sometimes just a transformer with a simple bridge rectifier is the best to use if you are sure your experiment can damage your equipment as it won´t take damage easy and even if it does you probably just need a new rectifier. play safe
Good idea about the Zener diodes, maybe even a TVS would be a good. I’m pretty sure it was the grounding arrangement that caused my issue, firing the output of the Marx directly into the ground terminal of the dc supply probably wasn’t my brightest idea!
Thanks for watching!
@@thecircuithelper No problem :) things happen. Even if you think you are safe. Not very long ago a phase to my incoming power to the house blew while my 6KW 400v 3-phase was running it did not immediately stop so the heat pump acted like a generator on the now floating phase and my kitchen light exploded and it completely killed my PlayStation 2 as well. In the PlayStation there was like stupidly rare avalanche diodes that surely don’t exist anymore that was killed along with fuses and stuff. I had to convert the circuit to revive the power supply again by replacing the diodes with a suitable MOV instead and mount a fuse holder and new capacitor. Things sure can cause havoc when you least expect it. But my PlayStation been working perfectly since the incident I could not control
Or, what he means is.
TRY THIS (at home or at work) but use extreme caution, or the zap test.
If it goes ZAP, when you poke a screwdriver's shank at it, don't use a finger instead.
If nothing happens, don't use a finger in case you didn't short-it correctly, and it still needs to ZAP something dumb.
This is why you use a 12v Lead-acid battery. You'll still get zapped, but at least your power supply won't die. Been there, done that. Still alive.
This is definitely the way to go, with the addition of a 20 foot copper pipe hammered into the ground to make a decent earth!
And always only touch things with one hand. Speaking of deadly electricity, back in the day I worked in the oilfield as a pumper. Id check condensate tank levels alone and out in the middle of the plains. It's windy, and you often times generate a decent static electric spark. If we didn't ground ourselves when going up the ladder, we could accidentally spark the vapor as we open the hatch. Fun tumes and those sparks are nothing near what this dude will put out lol.
The idea of a spark igniting oil vapor is scary as hell, at least I didn’t have that to worry about! Thanks for watching!
at a 30kv output, ur caps should be fine. Since they are all in series there isn't 30kv across every capacitor. Also thats definently not 30kv. And definently not 120kv at the final output. Seing as the spark was maybe 2cm or something, i would say its 20kv.Also, how did u brake ur PSU?
I was more worried about the caps in the Marx bank, they charge in parallel ultimately reaching the DC input voltage (assuming it doesn’t fire before fully charging), so 30 kV would be an issue. You’re right though, output from the multiplier definitely doesn’t look like 30 kV, I’m guessing more like 10k… not sure what was going on with the scope, probe probably needs calibrating or maybe I nudged the dial and accidentally set it to x500 rather than x1k.
No idea what happened to PSU, very weird, Marx bank fired and immediately the power went off (like I’d removed the mains). Wouldn’t turn back on, changed the 13A fuse in the lead and the 3A fuse in the PSU, still totally dead. Completely opened it up and couldn’t see anything obvious (no burnt components etc). There might be some other internal fuse I’ve missed, but tricky to know without the circuit diagram. If I had to guess, I’d say the Marx output directly to the psu ground terminal probably sent a sufficiently high current pulse to raise the voltage of the ground up, that’ll destroy most things unfortunately! Better to use a battery and a separate earth, but I didn’t fancy clipping the battery by hand and I don’t have a decent Earth in that lab, unfortunately!
Thanks for watching!
@@thecircuithelper as i said i would use a voltage divider. Also Car ignition coils opperate at low-ish frequencyes, so unless the capacitance is very high, the impedance is huge(u can see this when people use MOTs as a power supply). Discharging to your supply ground is never a good idea lol. And i realy think you should get good grounding in your lab. I realy dont know what happened to ur power supply tho... hopefully you can find a new one.
Very good video 👋👌
Thanks! I’m glad you enjoyed it!!!
Interesting.
Glad you enjoyed it, thanks for watching!
I have to say, that looks bloody dangerous! What would happen if you got ‘zapped’ by the output?
I dread to think! Quite a lot of stored energy, could be fatal, certainly not something to play around with!
Voltage multipliers with small sized caps are routinely used in bug zappers. Unless they are "super-sized" they can't do any real harm. OTOH, a microwave power supply can kill you if you just look at it hard.
The multiplier would hurt, but I guess such low current DC wouldn’t be a ‘show stopper’.
I would not want to get zapped by the Marx generator though, caps are 1 nF and there’s 8 of them charged to somewhere between 10-20 kV, this gives 0.5 x (8nF)x (15k)^2) = 0.9J… in comparison a microwave oven cap has approx 2J of stored energy (assuming 1uF, 2kV), a defibrillator capacitor can be around 100J, an enormous amount of stored energy to release in a few microseconds! Of course the internal inductance limits how fast this energy can be delivered and the cheap caps used in the Marx here are pretty poor (although adding them in parallel helps)….
1:05
"In other words ... don't try this at home"
NO... IN OTHER WORDS............ CRACK OUT YOUR SCOPES AND HAVE FUN
LOL
🤣 seriously though, don’t try this at home!! Thanks for watching!
@@thecircuithelper
LOL
Seriously though.... You know KNOW ONE is going to NOT to that .
but..for the official record
YOU ARE RELEAVED OF ALL RESPONSIBLITY AND ARE HELD COMPLETELY HARMLESS
Now.. Let's crack out our scopes and have some fun :p
Why didn’t he just use longer screws and run them all in from the outside?
9:22
I was hoping to use shorter screws and have them all from the inside, it’s better to have a rounder and smoother surface for consistent breakdown. However, soon realised that was never going to happen as there wasn’t enough space to do it that way! Putting both sides in from outside would have looked better, but it was so tough to screw in/out I didn’t want to change it!
👌👍
Thanks for watching!!
Soldering on top of a note book....
It’s a perfect insulator for both heat and electricity😆