This is an amazingly old thread. I tend to adopt the habit of wrapping wires around the terminals of capacitors when not in use (or discharging each time if the thing is developed enough to have a case on it.) I don't trust bleeder resistors, they've burnt out on me in the past and hurt like all Hell when you misplace your trust in them.
On Wednesday, May 2, 2018 at 9:45:16 AM UTC-4, Tom Knight wrote:
-- On Wednesday, May 2, 2018 at 9:45:16 AM UTC-4, Tom Knight wrote:
I would make very very sure that you had bleeder resistors direclty across all of your high voltage capacitors. Don't let these systems kill you.
Be aware that common resistors have a voltage as well as wattage limit, typically 500 volts for carbon composition resistors. Use them in series if you need higher voltage ratings. Discharging capacitors is not enough — they can recover charge even after discharge.
> On May 2, 2018, at 8:59 AM, John Griessen <jo...@industromatic.com> wrote:
>
> On 05/01/2018 11:04 PM, James Feeney wrote:
>> I think it could be used for electroporation, however the plates would have to be precise gap width, and pulse duration would not be very predictable at all. (Some papers suggest that pulse duration is not critical...)
>
> Sure, my electroporator, https://github.com/kanzure/culture_shock , uses one stage of doubling.
> It's driven by a python program creating pulse trains of sequenced duty cycle into the load, so the pulse shape CAN be controlled.
> It behaves like a HV DAC with a little fish-tailing overshoot if you try to make it put out
> over 50 kHz. Besides being an electroporator, the circuit boards can be a HV playground for tinkerers and engineers.
> I'll be announcing it here when ready to sell.
>
> If anyone is interested in doublers, I have a bunch of commercial HV PS doubler sections I can sell. They are all nicely spaced out and hold charge for a good while if not bled off for safety. They are quite deadly when they have enough capacity to supply
> more than the milliamps needed to cause fibrillation from an arm to arm shock...and I think these do.
>
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