[Ronja] Progress report

[Silvije]

That sounds great!
Very digital :)

if I just may point out that "analog" solution could be as simple as
http://repairfaq.cis.upenn.edu/sam/teeny.gif

so if you have 12V supply, I believe you could easily use 2n3904 and
would not need more than lets say 4,6 turns in primary and about 24-30 
turns in secondary of one little transformer... check the part count :)
just one transistor :)

btw. for making such little transformers I use to "modify" inductors 
"transformer like" from PCBs of burned ccflamps, there you can also 
find some realy fine high voltage capacitors (400V) and other stuff, if it 
is problem for someone to get them :)

and if you like this analog solution to be more "stable" you could use 2
transistor schematic... widely available...

regards


On Tue, 3 Feb 2009, Karel Kulhavy wrote:

> Hello
>
> I have made a 50V power supply for the photodiode. First I looked at some chips but they were difficult to get. Then I tried a rail to rail opamp and a diode-capacitor cascade. The available one for me was ICL7621 which turned out to betoo weak and too
> slow.
>
> Finally I took a 74HCT14 oscillator and 6 transistors to make a two-phase push-pull
> emitter follower. That works just fine. Produces regulated voltage across a 47V zener diode.
>
> The cascade is different from Greinacher/Cockroft-Walton the capacitors are not
> connected in series but in parallel.
>
> Karel
>
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