Raytheon's used operational amplifier is rare today, but the configuration can be adapted to use modern operational amplifiers.
We found this circuit in a Radio Electronics from February 1970. The frequency of 1,400 kHz in the...
This different power control circuit with SCR was obtained from a 1967 magazine. The SCR can be...
We found this circuit in a 70s Electronic Design documentation. The circuit uses general-purpose...