This circuit of an EDN divides the input pulse frequency by even values. The circuit is TTL and can be used as a shield for microcontrollers.
This simple MW radio circuit with two transistors was obtained in an Argentine publication from...
This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old...
This shortwave preselector was found in the July 1994 issue of Radio Electronics magazine. The...