Positive voltage converter.

[Paul Perry]

At 08:31 PM 9/01/01 +1000, stewart pye wrote:
>I'm doing some mods to a CS01 and have found that it uses a "psuedo
>negative" power supply. That is: the output of a 9V reg is used as ground
>(including the output socket) and gnd form the reg is used as V-. 
>I need to derive a positive voltage with repect to the CS01 gnd so I can
>power op amps to invert control voltages and such. All the charge pump IC's
>I've seen only do positive to negative conversion.  Any ideas???
>
Suppose you had a standard voltage doubling charge pump ckt.
Which expects to see + input.
You connect the '+' input to ground, and what would have been its ground
to the -9 regulated rail. 
Now the output of the doubler is 18v+ with respect to the -9 output,
or +9, measuring from the earth connected toi the 9v reg output.

At least that seems to be ok on the back of this gas bill.

paul perry melbourne australia