This Mullard circuit was found in a 1969 documentation. It uses complementary transistors on the output and does not need a transformer. The bandwidth goes from 100 to 20 000 Hz.
This configuration was found in old documentation and is valid for most general purpose NPN...
This circuit uses a capacitor to store energy. The capacitor is charged by closing S1 by a moment. Them,...
This circuit was obtained from a Popular Electronics of the 80's. It is set to a certain pulse...