This common circuit is from September 1984 Radio Electronics. The transistors are general purpose, and the frequency is given by the capacitors.
This two-transistor circuit was found in the August 1972 issue of Radio Electronics magazine. The...
This circuit was found in documentation by Linear Technology from the 90's. The circuit makes...
In the figure we show how to add a 100k ohms potentiometer to implement an oscillator controlled by this...