Time for fixing up an old electronics project - the 2-chip drum machine.
It's a glorified metronome.
It has a timer chip and an audio amp chip. If I recall, the timer is a dual 555 timer, which is an industry standard. It makes a couple of different sounds in repetition.
Runs off 2 9-volt batteries. In an upcoming post I'll go over a bunch of rechargeable batteries I use, and the little battery charger.
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