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 1969 Mullard documentation. Used transistors can be replaced with...
Found in General Electric's documentation from 1970, this circuit is indicated for the so-called...
The improvement we found in this stage on a common basis is the use of only one power supply. The...