This bidirectional motor control was found in an 80's Electronic Engineering. The circuit uses a component of the time and is suitable for motors up to 1 A.
This is the circuit of a “follow the line” type robot with inductive sensors published in Radio...
With a unijunction transistor and a tunnel diode it is possible to obtain rise times of 1 ns with...
This receiver for listening to headphones and 2-battery power was found in Japanese documentation from the...