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.
The idea is to interleave this circuit between the signal source and the amplifier. When the...
This circuit was found in a Popular Electronics of the 80's. The NE602 functions as a heterodyne...
Found in a 70’s documentation, this circuit can operate with signals up to 10 MHz. The operational...