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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Voltage Controlled Function Generator (CB18238E)
This circuit uses comparators equivalent to LM339 to generate signals of two waveforms whose...
RS Flip Flop using Comparator (CB13103E)
A Reset-Set flop-flop capable of directly controlling a relay or other power load can be...
Sine Wave Oscillator Using an Inverter I (CIR097E)
The circuit shown here can be used to produce low-frequency sine wave signals from CMOS logic. The...