[sdiy] analog clap details

[Colin f]

> I don not know if the 808/909 clap cirquits are the same as in the
> boss (amdek) hc-2 handclapper, I have scanned an article with 
> schematics
> and mods how to change the delay between the noise bursts and more...

The 808, 909, Amdek, and probably most other Roland designs are all very
similar.
The key part is the use of a quad comparator to generate the 'crack' part of
the sound - a rapid fixed number of decaying pulses.
The 808 and 909 combine the crack envelope with the reverb envelope
differently - the 808 combines the CVs and uses a single VCA for the noise,
the 909 (and Amdek, I see) have separate VCAs for the crack and reverb
noise, and different filtering of the noise for each.

Cheers,
Colin f