In this circuit of an old American documentation, the input impedance is the same as the output impedance. The circuit has a sensitivity of 1 Vpp at 75 ohms.
This circuit found in a 1988 documentation, uses a piezoelectric or crystal capsule as a...
We found this treble booster circuit in a Radio Electronics magazine from February 1970. It uses...
It is a small circuit, which coupled to any medium or short-wave radio, allows to evaluate the...