The use of field effect transistors in this circuit improves its performance. This configuration is from a 1975 circuit manual. The transistor can be any general-purpose FET such as MPF102 or BF245.
The circuit shown in the figure generates a pulse train whose frequency is determined by the...
This circuit was found in a Japanese publication from the 1960s. It uses germanium transistors and is powered...
I found this circuit in a magazine Mundo Eletrônico, from the 70s published by my friend A....