This circuit, which appears in other versions on this website, was obtained in old documentation. The load of each PUT depends on its characteristics. The circuit is low frequency.
This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the...
This mid-frequency amplifier circuit was found in an American publication from the 1950's. The...
The circuit with a common operational amplifier uses a zener as a reference. The circuit is from...