Simple Charger (CB26302E)

This charger for small batteries was obtained from the 1982 Radio Experimenter Handbook. The circuit is low current.

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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...