[sdiy] Roland drum trigger spec's

[nss at hevanet.com]

>The 808 uses 1ms, 5 volt trigger pulses, and accent CVs between 4 and 14 volts.


So the pulse at the input of the tone circuit would be from 4-14 volts,
that's after those two trans that add the trig and the acc pulses?

>Disable the twin-t oscillator by removing the trigger input cap to it (C86 in the mid tom) and see if you are getting no noise, or just very quiet noise.

No noise, just a thump. I cranked up the PN input volume with an
external amp, still no noise.

>Remember the original noise content on the 808 toms is very quiet anyway.

I'm comparing it to the re-birth version, as I have never seen an 808.
Is that an ok aproximation?

Now that I just blew up my midi-cv converter messing with
this($%%%$@#%$#!!!!!!!!), could anyone explain how this part of the
circuit is suposed to work? Maybie if I understood it better, I'd have
better luck. I have lots of time to think about it until I get the
midi-cv fixed now...

Thanks for the help,
-Al Fisher