Re: generating 180VDC at 5mA or so, simply...
From: Yzordderex (yzordderrex_at_verizon.net)
Date: 09/01/04
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Date: 1 Sep 2004 09:31:11 -0700
I certainly like the idea of doing stuff just for fun.
Maybe a 555 would work for you to control a boost
converter. Drive the previous mentioned fet.
You say discreet components. Maybe a pair of transistors
operated in freerunning mode to run boost converter. Could
do bang-bang control and run the thing in burst mode. Maybe
you can do the whole thing with 3 bipolar transistors and a fet.
Maybe all bipolars.
regards,
Bob
mdeblis@hotmail.com (Mike Deblis) wrote in message news:<bc45f679.0409010100.6e9263c1@posting.google.com>...
> "Mike Deblis" <mdeblis@hotmail.com> wrote in message news:<ch2n7j$kvi$1@hercules.btinternet.com>...
> > Hi,
> >
> > I was wondering how to generate about 180VDC continuous at a few mA (at
> > least 5) from 9-12VDC in (no mains).
> ...
>
> I should qualify this - 2% or 3% regulation is probably fine, and this
> is an exercise (not a class - I'm far too old for that!) in NOT using
> a switcher chip - I'm well aware of their advantages in commercial
> products, but this is just a bit of fun to see how simple such a
> non-critical PSU can be made. I've use LT and MAX (771/1771) for
> exactly this sort of PSU, but I don't need their 80-90% efficiencies
> and 1% reg etc. Its more a question of "given a couple of discrete
> semiconductors and a few passives, plus a hand-wound small inductor,
> can something good enough be made"? i.e. "outside the box" thinking...
>
> The object is to drive some neon dischange tubes that strike at about
> 180VDC and which take about 2mA or so each.
>
> Mike
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