Lead Acid Battery Charger (CB26301E)

This power charger was found in a 1990s issue of Popular Electronics. Integrated circuits must be equipped with a heat sink.

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Audio Visual Alarm with Lock (CB12457E)
This circuit is from a 1996 publication, but it can be assembled with several equivalent...
Hartley Oscillator (CB18144E)
This conventional Hartley oscillator circuit with an audio output transformer was found in a...
Overtone FET Oscillator (CB13085E)
The oscillator in the figure has its frequency determined by the crystal. The indicated value is...