[sdiy] Pulser & Ring Mod PCBs from by Music Easel adaptations available; New Year's Eve Special

[lanterma at ece.gatech.edu]

On Jan 16, 2011, at 1:39 PM, Dave Leith wrote:

> Not sure if this is normal but it seems to be created by the capacitor (910pf to ground) that is in the reset circuit and stretches the length of the reset pulse. The cap is on the front panel. If the cap is removed one
> gets a perfect downward ramp at all frequencies. The reset circuit is connected between pulser pls in <3> and pulser pls out <2>

As a total stab in the dark... maybe the cap is meant to length the pulse to make sure it's long enough to correctly trigger other various assorted Buchla circuits that take triggers?

Maybe in his original design, the pulse was long enough for the pulser to trigger itself, but not other things, so he added the cap to fix that.

Again, that's a major stab in the dark. Out of the various circuits I've adapted, the pulser is one of the ones that I understand the least, which is why I was particularly glad when I got it working, since I don't understand its operation enough to seriously debug it.

- Aaron