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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Proximity Detector (CB5063E)
This circuit was found in a 1980s US publication. There may be some difficulty in obtaining the...
Operational Band Pass Fctive Filter (CB14441E)
The circuit shown is from the Motorola Linear Databook of 1990. In the example, the components are for the...
Experimental Signal Generator (CB25828E)
Ideal for benchtop use, this dual-band circuit was obtained from the 1995 Electronics Now...