This class B circuit was found in the 1960 Mullard transistor reference manual. Transformers are the critical components. The source is not symmetric.
This 2003 circuit serves to digitally show the intensity of a sound captured by a microphone....
The circuit shown in the figure makes it possible to control a stepper motor via a PC's serial port...
This circuit was found in an old American documentation. Its purpose is a proportional scanning signal...