Anti-theft with voltage sensor (CB26166E)

Found in the 1991 Electronics Experimenter Handbook, this circuit detects voltage variations in the circuit when the engine starts.

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High speed alarm (CB20663E)
Found in documentation from the 1970s, this circuit uses an oscillator and a display to warn of...
Simple Siren 555 (CB3862E)
This circuit simulates a low-level siren and can be supplied with voltages from 5 to 15 V....
Frequency Selector 741 (CB16232E)
The filter shown in the figure, using only an operational amplifier, is characterized by allowing 1...