Thursday, May 07, 2009
TR-808 Cowbell Clone w/ Mods
YouTube via EA78751
"read the full article:
http://ericarcher.net/devices/cowbell/
This was a design exercise. I'm experimenting with digitally-controlled analog circuitry + simple digital pattern generators.
There is a minimal digital sequencer onboard, controlling eight analog switches that activate "bends" to alter the pitch, filter, accent, and envelope.
The 808 cowbell is a cheezy sound, but its design is interesting to study because Roland engineers were masters of minimal analog synth design. They rolled this one up tight! ... with just 2 simple chips (MC14584 & TL072) and 4 transistors, the 808 cowbell contains two square wave oscillators, two VCAs, a triggered envelope generator, bandpass filter, and buffer amp. Nice one Roland... too bad it doesnt sound like a cowbell.
Eric Archer
2009"
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