Battery Charger (CB26303E)

This automatic battery charger was found in a Popular Electronics from the 90s. The circuit uses a relay for automatic shutdown.

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Unregulated power supply (CB22341E)
This full wave source uses germanium diodes, and its current is a few milliamps. We found it in an...
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Current pulses (CB8936E)
Found in an American publication from 1968, this circuit generates pulses at a rate of 2,500 per...