We found this Vox in a 1969 Motorola documentation. Transistors support modern equivalents and the SCR can be a TIC106. The reset is done by a push button.
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...