Found in an American documentation from the 90s, this circuit has a configuration that has been extensively explored in other articles on this site. The FET can be the MPF102 or equivalent.
This article is from the Italian magazine Sperimentare number 11 of 1975. It can be assembled with...
The circuit shown is from a 1972 publication. Transistors can be current types like 2N2222. The...
This adjustable oscillator has the traditional configuration already presented in other articles. The...