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.
The circuit is from American documentation from the 1980s. Operational ones are not common today,...
This simple continuity tester consists of an oscillator found in the 1983 Electronics Experimenter Special...
This circuit is from a 70s linear integrated manual. The integrated circuit used is uncommon today...