This circuit uses an 80's operational amplifier. The circuit is from an old RCA manual and can be implemented with modern components. Observe the symmetrical power supply.
This circuit is suggested by RCA and is based on a dedicated integrated circuit that is the...
This 4-competitor TTL speed game was obtained in a 1980s documentation, but can still be easily...
Relays from 20 mA to 200 mA can be driven by this sensitive circuit.6 or 12 V relays can be used...