My very first DIY project, built by my dad. The PCB came from a magazine, probably in 1980. The battery was replaced a few years ago. I designed the one mod: the line output on the side and the speaker/phono switch. The rest was done by my dad.
I later built the same circuit on a breadboard and changed the pitch, making it sound even *less* like a fog horn! Today, this technique is called circuit bending...
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