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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Simple MW Radio 4 (CB4362E)
Originally this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
LED Driver LM324 (CB15182E)
In the figure we have the way to excite an LED with one of the 4 operational ones available on the...
Logic Level Indicator (CB21517E)
In this version from the 60s, the indicator is a light bulb, but the circuit can be modernized with the...