We find this circuit in an American 80's documentation. No further information about the transformer is given. The circuit serves as a reference for any repair work.
This excellent quality transistor amplifier using Darlington transistors was found in a 1980s...
This circuit uses one UJT (Unijunction Transistor) to produce three different tones in a...
This traditional doubler configuration with the 555 can be found in other articles on the author’s site....