This simple unijunction and bipolar generator appeared in Radio Electronics magazine in September 1865. It generates signals from 100 kHz to 60 MHz and is powered by two 9 V batteries.
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...