This circuit is from an article about operations in a Radio Electronics magazine from around 1968. The transistors are types of the time and the power is not the greatest.
This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is...
Obtained in a 1968 Electronics World, this circuit uses transistors from the time and the sensor...
The basis of this circuit is a CA3130 operational amplifier. The transistor can be BC548, and the...