This circuit, with a 12 V input, was found in a Popular Electronics from the 1990s. Information is given about the ferrite-wrapped transformer. The transistor must be mounted on a heatsink.
This circuit uses a magnetic phone containing 3 germanium transistors. This is a Japanese...
This is a simple circuit that we found in a 2001 documentation. The integrated circuit must be...
This frequency triple oscillator circuit was found in an American publication in 1967. The FET is...