This circuit was found in the 1969 RCA thyristor manual. The circuit has a limiter (clipping) with two 12 V zener diodes in opposition to cut power grid pulses that may influence the trigger.
May 2016 - It can be obtained from Mouser Electronics new microcontrollers from Texas MSP430...
This circuit is from old documentation, but the regulator may be 78xx series equivalent and the...
The two circuits shown show how to obtain an SSB / CW control for receiving this signal top at a...