How a $0 75 Chip Became an Electronics Legend
1K views · Sep 21, 2026 · Science & Technology
Comments · 1
@HowToHomeLife · 3 days ago
I built a "busy-box" for my grandchild using an old LEEDS & NORTHRUP K2 "slide wire potentiometer", replaced all of the original internals and used a 555 timer/square wave oscillator, a transistor AM radio, a geared DC generator on the slide wire wheel that charged a NiMH 12-volt battery. She absolutely loved playing the AM radio and pressing the button which turned on the oscillator while turning I'ts frequency knob that were injected into the radio producing all sorts of heterodyne sounds out of the internal loudspeaker! David Riddle
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