This oscillator for frequencies up to a few tens of kilohertz was found in a 1970s documentation. The transistor can be of general use. For the component values used, the frequency is 250 Hz.
This circuit is from the 1972 RCA Linear Integrated Circuits Manual but can still be easily...
This simple experimental circuit, with a good external antenna can capture distant stations in the...
The circuit used is the 4093 configured as an inverter in this application from Radio Electronics from...