Hi Roman,

I'd certainly be interested.  I have a 3 transistor voltage inverter
(+5V to -15V) which I was considering posting (not nearly as elegant as
your 2 transistor circuits but quite stable).  As you know, we
frequently get requests on list for such circuits for LCD contrast and
other (low current) purposes.  Perhaps we can adapt your 2 xstr boost
circuit to voltage invert.

Best regards,

Dave Minkler

Roman Black wrote:
>
> Hi, in messing around I came up with a *really simple*
> 2-tran boost circuit that gives 13.3v regulated
> output from a regulated 5v input.
>
> It supplies up to 12mA @ 13.3v, but only starts up
> reliably when output load is about 10k (about 1mA)
> during startup. Only 2x NPN tran, 1N4148 and cheap
> rf choke, 4 resistors, 2 caps, 13v zener.
>
> It can be turned on/off at will by attaching one
> tran base to a PIC output.
>
> I think Myke was after something like this for a
> cheap PIC programmer etc? If this spec is acceptable
> i'll write it up or does it need more current etc??
> -Roman
>
> --
> http://www.piclist.com hint: The PICList is archived three different
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--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.