We found this circuit with JFETs in a Radio Electronics magazine from June 1969. The circuit has its assembly described in a complete article. Equivalent transistors can be used.
This simple circuit makes it possible to test diodes and transistors for generating use and medium...
This 2.5 A power supply was found in a 90's QST magazine. The power transistor must be mounted on a...
This circuit is a digitally controlled variable capacitor. We found it in American documentation from...