Based on a PLL 567, this circuit serves as a receiver for the CB9574E circuit. S tuning is done in R1 and it is used for frequency modulated signals.
We found this circuit in a 1967’s Electronics World. The circuit can be made with modern...
This adjustable direct current source circuit uses a triac operating as a variac. The circuit is...
Using the 2N2646 this circuit was found in a Radio Electronics magazine from July 1968. The...