Suggested by an American documentation from the 90s, this circuit generates signals with frequencies determined by the capacitors and calculated by the formula next to the diagram.
This circuit, which combines a bipolar with any JFET, was found in the April 1993 issue of...
This simple metal detector was found in a 1960 Sylvania transistor manual. The phone must be high...
Found in documentation from the 90s, this circuit was used in communications receivers of the...