This circuit was found in a Modern Transistor Workbook from 1965. The circuit sends signals from a small record player to a medium-wave radio placed nearby.
IDT ZSSC3230 Capacitive Sensor Signal Conditioner Available from Mouser Electronics stock, this IDT...
This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V...
This two-transistor constant current source is from a 1968 documentation. Modern equivalent...