This 80's circuit uses an audio amplifier to obtain a symmetrical source from a single source. The maximum current is on the order of 1.3 A and the input voltage must not exceed 20 V.
Found in an 80's Elektor, this circuit can use any equivalent optical coupler. The buzzer is of the...
This circuit was found in a General Electric documentation from 1970. It is used in an optical...
This circuit can switch signals in the 3.5 to 30 MHz band. We found it in a QST magazine from the...