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From: "John Griessen (john AT ecosensory DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Date: Thu, 15 Feb 2018 15:26:14 -0600
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On 02/15/2018 10:23 AM, Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com] wrote:
> I was thinking about obtaining or making a ferrite-core transformer with a 1:100 turns ratio, and driving this with a half 
> H-MOSFET bridge from an 18V (adjustable) DC power supply. Can someone point out some existing designs? Or are there people here 
> who are willing to discuss some design ideas? For instance, I'm wondering if a resonant setup (i.e. with a secondary HV capacitor 
> in the nF range) is a good idea or not, how to estimate a damping resistor in the output and quite a few more questions. I do have 
> some experience with old TV flyback style HV generators, but this is a little different.
> 
> Thanks in advance, and once again my apologies  if my request for help is inappropriate here -- I won't pollute this list any 
> further with this :-)

No, that's not really off topic since I have a project with circuitry like you want, and with plans to do
well calibrated feedback controlled HV from python programs...

It's made using gschem, pcb-rnd (evolved from pcb), and volt doubler part simulated with gnucap.

The custom push pull transformer I designed will be
available for about $2 each in small quantities.  Kits to assemble a "High voltage playground for engineers and hobbyists",
will be available in a couple of months.

https://github.com/kanzure/culture_shock
It's aimed at a biologist task called electroporation, but besides that, it's a computer drive HV DAC and low speed ADC 
oscilloscope.  There's a list server for anyone interested in discussing how to use or improve the repo:

	https://cibolo.us/mailman/listinfo/open_electroporator

The archives for the list have photos too: 
https://cibolo.us/pipermail/open_electroporator/attachments/20180214/47fae23e/attachment-0001.jpg
shows the latest prototype assembly I'm working on now.  More later today.