5 circuits of 555 Alarm sound and tone generator - ElecCircuit.com | Circuit, Alarm sound, Audio ideas
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AB1DQ – Ham radio operator, electronics hobbyist and sometimes photographer.
Morse Code Practice Oscillator - Codrey Electronics
descrete audio amp, function generator, AC line current detector
Simple, low component count tone generator. It can be adapted to create a morse code circuit, by adding a switch to the o… | Circuit, Electronics circuit, Generator
Steam Boiler Model Boiler, Steam Generator Steam Boiler, Steam Engine Model Boiler - Switch Caps - AliExpress