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MAKE contributor Michael Una cooks up some particularly head-bobbing beats with help from an old arcade sound effects chip (plus a 4017 sequencer). The SN76477 “complex sound generator” IC is best known its work in Space Invaders arcade cabinets – the chips’ onboard LFO, VCO, and noise generator combine to produce all manner of blippy goodness. The bad news is it’s no longer produced :( Though some surplus and rare-chip sellers have them from time to time.) So if you do score one, a drum machine project sure seems like a worthy home!

olddiysnsynth cc Homebrew drum machine uses an arcade classic
25 year old box of sounds

Collin Cunningham

Born, drew a lot, made video, made music on 4-track, then computer, more songwriting, met future wife, went to art school for video major, made websites, toured in a band, worked as web media tech, discovered electronics, taught myself electronics, blogged about DIY electronics, made web videos about electronics and made music for them … and I still do!

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