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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Instrumentation Amplifier (CB13219E)
With changes, this circuit from a documentation of the 70s, can be adapted to use more modern...
Signal controlled switch (CB9272E)
Found in a 1968 EEE, this switch controls a high-power load from an audio signal. The current is...
Non-linear amplifier (CB24008E)
In this circuit the gain decreases as the input signal intensity increases. The circuit is from a...