[sdiy] Roland drum trigger spec's

[nss at hevanet.com]

>You need to check that you have a noise signal riding on the top of the
voltage.

Yes it is there.

>A scope would be very handy at this point...
Try feeding a different audio signal in at the pink noise input - it'll
be easier to hear if it is being amplified by the vca.

An interesting thing did happen, when the midi-cv blew up, it was
putting out a steady 1-2vdc, and then the noise came out the output! The
volume of the noise dropped as whatever cap that was in the midi-cv
discharged and the voltage dropped. So I guess the general idea works.
Just not with the trigger!

>Also check that the transistor pin-out is what you expected

Yea, seems right, checked and rechecked in in the meter. a 2sc945 b,c,e
pinout. When I get a chance, I'll play with different pulse widths and
voltages and seee if that makes any difference. I had kinda given up on
these things a while ago, if I did not know there was suposed to be a
noise component to it, I would say they sound fine. Now it's bugging me
again...

Thanks again,
-Al Fisher