MOTM

No you're not. I finished my sub-octave multiplexer on Wednesday afternoon.
I mounted it in a rack, next to my power supply, and hooked a HP function
generator into the A input. I didn't know how hot the HP was going to be, so
I turned everything off first, pulled all the volume and input pots down,
etc. Slowly I brought up the levels, heard the sine wave from the function
generator through the output of the 120, then switched the mode for A to
square. Nothing. Damn. I didn't *want* to have to troubleshoot it. I was so
careful when I built it! What could have gone wrong??? I tried an SH-101
into the A input. Same thing. Sent the signal as an aux send from my mixer.
Nothing--I could only hear something when mode was set to "norm."

What could be wrong?

(excuse my french)

TURN ON THE POWER, DIPSHIT!

Much better. Worked perfectly.

> -----Original Message-----
> From: Doug Pearson [mailto:ceres@...]
> Sent: Friday, June 11, 1999 2:59 PM
> To: MOTM listserv
> Subject: [motm] I am the stoopidest MOTM builder alive
>
>
> From: Doug Pearson <ceres@...>
>
> 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@...
>
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