Microphone preamp (CB22043E)

This preamp was found in an old English publication. Any usage JFET can be employed. The output is high impedance.

High Sensitivity Fan Control (CB15519E)
Great sensitivity for the circuit can be obtained with a Darlington amplification step for the...
Class D Experimental Amplifier (CB5009E)
This 2005 circuit was found in an English publication and can be implemented with virtually any...
Vehicle Alarm (CB4867E)
This car alarm was found in an American '80s documentation. The circuit automatically activates...