Archive of the former Yahoo!Groups mailing list: MOTM

previous by date index next by date
previous in topic topic list next in topic

Subject: RE: MOTM-800 ADSR Mod

From: "Dave Bradley" <daveb@...
Date: 1999-07-19

> I looked through the archives for the mod to give the 800 full ADSR with
> only a gate signal,
> but only came across the jumper wire from the Q1 collector method.
> There was also mention of using a 5k resistor.

That's the one. I just used a jumper, with no problems. Others have stuck a
5K resistor in the line due to paranoia about potential transients or shorts
when plugging / unplugging a trigger input.

I attached my wire not to the Q1 collector but to the top of the board at
the nearest resistor connected directly to the collector (schematics are at
home, so I don't know which resistor). I then cable tied the extra wire to
one of the bundles going to the jack.

> Which side would the collector of Q1 be?

The collector pin can be deciphered from the schematic. The lead that
connects perpendicularly to the vertical line in the transistor symbol is
usually drawn from the left, and is the BASE. The lead that emanates from
the vertical line at an angle with an arrowhead is the EMITTER. The other
lead emanating at an angle without any arrow is the COLLECTOR.

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.