Found in American documentation this circuit uses transistors of the time. The circuit can be made with current components. It works as a trigger working with 600 ohm signals.
This 7400 TTL circuit has a memory, keeping the LED on when a pulse is detected. The circuit must be...
This dual-LED circuit indicates three signal levels. It was found in the January 1996 issue of...
This circuit measures the RF power of oscillators and small transmitters in the range of 0.05 to...