simulation of diagrams?

[Michael Buchstaller]

Hmmm...

>We used two netadaptors set to about 12V (one was about 12.4, the other one about 11.9)
>and stuck the two plugs together (polarity was right.)

>We too measured the voltage on the IC pins
(measurement protocol snipped)

I am not Harry, but it seems strange to me thall *every* voltage you tested was negative.
Are you sure you have connected the two power supplys in the correct way ?
The one which is supposed to be the negative should have it´s positive output connected
to the other (positive) one´s negative output. This connection will be your ground; the positive
output ot the positive supply is +12V, the negative output of the negative Supply is -12V.


-Michael Buchstaller