60's crystal radio (CB22171E)

Found in an English publication from the 1960s, this circuit uses period components, including the commercial grade coil.

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Colpitts Oscillator (CB6185E)
This circuit was obtained from an American 1980s documentation. The frequency depends on the...
Braking Alert (CB16875E)
This circuit consists of a sequential that is activated when you step on the brake pedal (brake...