Triggered Oscillator (CB21252E)

This trip switch circuit was found in a Popular Electronics from the 90's. The frequency basically depends on C1 and R1.

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SCR Light Alarm (CB12197E)
When the light falling on the sensor is cut off, the SCR fires, powering the lamp. Remember that...
Swimming Pool Alarm (CB15051E)
When the sensor is wetted by a spray caused by someone falling into a pool or even by a wave...
Debounced Switch 7404 (CB3861E)
This traditional TTL anti-clock setting was found in a 1993 American documentation. The circuit...