This circuit is from a Radio Electronics from October 1970. The circuit uses transistors from that era and has a low impedance output. The resistance R1 depends on the impedance of the input signal.
This notch filter or reject filter rejects signals of a certain frequency with good selectivity. The...
This setting appears with variations at various points on this site. This is from a Motorola...
We find this simple circuit that operates at a frequency of 5 to 10 MHz in an old English...