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 circuit was obtained from a 1966 magazine but can be easily assembled using the 2N2646 as a...
In the figure, from a documentation from the 70s, we have a few-watt amplifier for general use....
This configuration, which appears in other articles on this website, was found in a European...