>
>        ------------------------------------- +U (0.6..1.55 V)
>        |                    |
>        R20K              || <
>        |                 || <
>        ----------------> || <
>        |               > || <
>        = 10nF          |    /------>|--|
>        |               ----| BC337     |
>        |                    \          |
>        |                    |          |
>        --------------------------------------
>
>The transformer is made of a ferrite toroid, size was about 4x3x2 mm (I
>found it from my pocket). I made there about 10 + 50 r (even 10 + 10
>worked fine). Capacitor was firs 1uF, but it was too large in size and we
>used 10 nF in the last proto. R10K made a High Brigh LED run a bit too
>bright to be reliable, so we changed there 20K.


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?

Cheers,

Octavio
======================================================
Octavio Nogueira  - e-mail:   nogueira@mandic.com.br
http://www.geocities.com/~oct_nogueira
"ProPic" Production PIC Programmer Windows under US$20
======================================================