808 Cowbell Eagle Layout

jbeuckm · Posted: Mon Aug 17, 2015 8:49 pm Post subject: 808 Cowbell Eagle Layout

I have a euro layout for the 808 cowbell that must be fairly close to working. If I press fingers to short the two oscillators to the output, I can hear and tune each. But I can not trigger any sound with the trigger and accent inputs. On the Yocto project schematics, I noticed that the trig (accent?) input has a different circuit than the rest of the drums. Can someone tell me what this part of the trig input does?

For the other 808 voices, I have been able to use a DC voltage for accent or the same scaled gate signal that I use for trigger. (I get a scaled gate signal from the "drums" configuration of a PAiA 9700.)

Here are my Eagle files: https://github.com/jbeuckm/808-Cowbell/tree/master/eagle (DELETED)

UPDATE: This part of the 808 "TRIG" circuit scales the accent voltage up to 5-15 for the cowbell and cymbals.

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jbeuckm · Posted: Wed Apr 20, 2016 7:47 pm Post subject:

I restarted this from scratch and now it works. One-sided Eurorack format PCB with tunable components VERIFIED.

Eagle files:

https://github.com/jbeuckm/808_CB/releases/tag/v0.1

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