We found this circuit in an American documentation from 1969. The circuit works with the polarized transistor in reverse in the avalanche mode.
Found in a Hands On Electronics from the 80's, this circuit activates a relay with alternating...
This 1 A circuit was found in a Philips documentation from 1966. The transistor is of the time,...
We found this circuit in the Motorola Linear Databook of 1993. It is the traditional configuration with...