This circuit is from a Radio Electronics from March 1960. The generator works with a 22.5 V battery, generating good intensity signals determined by the LC circuit.
This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate...
This integrated amplifier was used in televisions from the 70s, with good sensitivity...
The input impedance of this circuit is very high, on the order of 4M ohm and the output impedance is...