On Wed, 18 Feb 1998 18:40:36 -0300 Octavio Nogueira
<nogueira@MANDIC.COM.BR> writes:

>Ok, I used this circuit to make 22V from 5V, what I need now is -22V
>from 5V. Is there any way this circuit could be modified to do that?

It is simple.  Turn the circuit "upside down," using a PNP transistor.
The collector of the transistor will now fly to a negative voltage.  The
inverting version does need to work a little harder since the input
voltage is not added to the output voltage.

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