This circuit was obtained from American documentation from the 1990s. The transformer can be a car ignition coil that works like an autotransformer. Q2 must be equipped with a heat sink.
This circuit was found in a Radio Electronics from May 1965. The transistor is a power transistor and in...
Found in an American paper from the 90's, this circuit can be adjusted to pass frequencies above 30 to 300...
This circuit is from a 1990s publication by William Sheets. The circuit consists of a stage whose...