This circuit works with the previous two by demodulating the signals received modulated in FM. The circuit is from the Radio Electronics magazine of December 1992.
Found in a 1974 Ferranti transistor manual, this circuit drives a sensitive 12V relay in...
This circuit is a telephone line simulator and can be used for internal communications. It is...
This half-wave control is used for resistive loads of up to 200W with the TIC106. The diode can be...