Car alarm (CB23933E)

We found this circuit in Radio Electronics from October 1968. The circuit drives headlight bulbs and can be adapted for current applications.

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11-meter range receiver (CB23825E)
This remote-control circuit was found in Radio Electronics magazine from June 1962. It drives a...
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In the figure we have a bistable multivibrator using an operational one. The circuit is from old...
Oscillator up to 100 kHz (2 transistors) (CB13136E)
The circuit shown in the figure uses general purpose NPN transistors and can be used to generate...