Why not make my first post to the MOTM list a ripe opportunity for some
public humiliation?
I successfully built MOTM-110, -120 and even -300, but I couldn't get the
easiest one (MOTM-800) to work - all the gate input apparatus was dead and
the input transistor (Q1) wouldn't turn on. I called Paul for help, mostly
to verify that I'd need to replace the transistor (Q1) and diode (D1) at
the input, and he helped clue me in on some diagnostics, as well as asking
all the stupid, obvious questions that have to be asked first (are all the
chips oriented properly? do you have the proper wires soldered to the
proper jack terminals? - duh!).
DUH! is right. I went back to the circuit board to remove D1, just to see
what would happen - it still didn't work. Then I looked below D1 at the 3
wires coming from the circuit board to the gate jack ... no! I couldn't
possibly have been that stupid! I was. Ground (grey) and output (white)
wires were soldered INTO THE WRONG HOLES. Rather than muck with the
circuit board, I just swapped the two wires on the jack terminals and
presto! One 100% working MOTM-800 ADSR EG!
Boy do I feel stupid (sorry for taking up your time, Paul!). But hearing
those modules work together sure made me feel good!
-Doug
ceres@...