Inverter Amplifier (CB6431E)

This high input impedance circuit was found in a Popular Electronics of the 90s. The circuit supports modern operational.

5V x 500 mA Buck Converter (CB9952E)
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...
Temperature control (CB10168E)
This circuit makes use of a constant current source to control the temperature of a direct current...
Transistorized Amplifier (CB16786E)
This circuit provides a few watts of output and can be used in the car as an auxiliary amplifier....