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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Temperature Transmitter (CB18756E)
This circuit can be used as a shield for transmitting the temperature of a sensor. The circuit is from...
Gain 100 operational L161 (CB4909E)
We found this circuit in an old manual. The bypass range is 20 MHz and the power supply must be...
Audio Preamplifier (CB18331E)
This small audio amplifier uses germanium transistors and a 12 V supply. The circuit is from a...