This simple circuit for the 3 to 30 MHz range was found in the Electronics Experimenter Handbook Special Projects of 1983. The coils consist of 10 and 50 turns of 32 wire on a 1 M x ½ W resistor.
Found in an American documentation from 1968, this circuit uses transistors from the time. The...
This circuit was found in a 1980s Intersil documentation. The integrated circuit used is not...
This simple 3-channel passive mixer can be used with low-intensity signal sources but requires...