Battery Charger (CB6058E)

This circuit is from an 80's Radio Electronics. The circuit has several output options for 50 mA currents with load indicator through LEDs.

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Expanded-range voltmeter with LM3914 (CB25453E)
This circuit with different colored indicator LEDs has an expanded scale. We found it in the March...
Customer Service Counter (CB6141E)
This circuit can be used as an answering password system in a store, office, or other location....
Electronic Pendulum (CB5022E)
This circuit is from the American magazine that no longer exists Science & Electronics,...