Michael,

You are correct. i have my enable going to a mpsa42 that is providing
ground to a mpsa92. the hv output goes through the a92. I am using an
IPD60R380C6 650v mosfet with a Id of 30A and a 100uH inductor. past
that i have a RS1GFS Diode  and 2 .47uf 400 volt caps in parallel. The
voltage input is the only downside. I can't go down to 2v.

Jason


On Apr 5, 1:40 pm, "M.J.Sangster" <[email protected]> wrote:
> I'm guessing he's using the 34063 for regulation, perhaps the HV
> transistors are cutting the output voltage? Jason?
>
> I use a 34063 circuit on my Nixie clocks, and get anywhere from 60-82%
> efficiency depending on component selection. The max output would
> depend on rating of the inductor, hv capacitor, switching Mosfet, and
> trace sizes. I find the 34063 makes a good solid hv power supply.
>
> I do need a 2 - 4v input capability for some of my upcoming projects,
> and I know the 34063 can't do it. I will use the Taylor supplies for
> those designs.
>
> - Michael Sangster
>
> www.coldwarcreations.com

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