I was slightly wrong since Myke Predko mentioned
"AA" battery to drive a PICmicro MCU from and to create
Vpp voltage in a programmer circuit." (09.23.02)

Anyway, Vpp consumes no current, just  voltage  and
7805 when fed from 15Vdc at 100mA would dissipate 1W.
Not very efficient idea.
And I suspect those adapters, entitled as 12Vdc@xxmA,
would not produce 15v under max load.

 Mike.

Wagner Lipnharski wrote:
> Mike Singer wrote:
> > 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.
> > .
> > .
> >> 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
> >
> >  If Myke's programmer is fed with AC, why not use
> > voltage multiplier-rectifier and simplest regulator?
> >
> >  Mike.
>
> There are plenty of DC Adapters entitled as 12Vdc@xxmA that in real
supply
> 15Vdc up to @100mA, this somehow helps a lot, isn't it?  Nothing that
a
> 7812 with one or two diodes in series at the ground lead to output you
12.6
> or 13.2V, and another 7805 for the 5V.  Simple, neat, low cost and
easy,
> what is a difficult thing to get, right?  "Simple" and "Easy" are not
> synonyms, and they are not found together very often.

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