[sdiy] 808 Bass Drum

[Colin f]

> Simply get PCB prints here:
> http://xlargex.xl.funpic.de/
> 
> Its a full 808 clone done by Sebastian Lindstaedt, with midibox.org 
> sequencer.
> There are 3 160x100 mm pcb for all the 808, or individual PCB 
> for each 
> instruments.

One thing to be careful of with a lot of the 808 sounds...
They use hi-q twin-t filters that are very close to oscillation. The trigger
pulse hits the filter, causing it to oscillate for a short time, but then
decay to silence.
You have to be careful to keep any wiring to tune pots as short as possible,
otherwise these filters will pick up and boost any mains hum they can find,
especially if the filter is tuned near a harmonic of mains frequency.
A better design would mount the pots on the PCB, just as the original did.
I made this mistake myself...

Cheers,
Colin f