Thank you amyk for the tips,
I have some info from the service manuals, this is the block
diagram of the IC:
http://www.flickr.com/photos/14336723@N08/7635785700/#in that flickr albume there are some other images, one example
of in curcuit usage is here U2530 U2535 U2540:
http://www.flickr.com/photos/14336723@N08/7635785570/#I know that Pin 5 is Vcc +5V
pin 2 GND
pin 9 is connected to the can so to the bottom of IC, in circuit it is tied to -15V trough a resistor
pin 6 is out
other pins are inputs.
Logic levels are not very clear from the schematic, some inputs are
directly connected to 0-5V, some others are connected to lower levels,
the output itself is annotates as 1V high level.
Is there a rule for the relative position of E B C regions of the
transistors? Or I should deduce from the schematic where is the
Base etc?
As for the image, I'm limited by my setup, but I think the lighting can
be greatly improved, in that image the lighting was from ambient,
and are visible vertical structures, if I light from another orientation
I can see orizontal features. Any tip for improving the features visibility is welcome.
Fabio.