Signals of up to a few tens of kilohertz can be generated by this circuit found in a European publication from the 1980s. Transistors admit equivalents and the unijunction can be 2N2646.
This is an improvement on the previous circuit with a preamplification stage. The circuit is from...
This circuit was found in a Texas Instruments handbook about operational amplifier. It has a very...
This circuit was found in an American publication from 1965. The circuit uses components from that...