This circuit was found in an Elektor from the 90s. It is a circuit that generates different types of sound effects. The components are still common today.
This circuit from a 1988 documentation uses an NTC sensor to keep a greenhouse temperature...
The power transistors of this 80's circuit should have at least 10 A current collector and mounted on...
This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of...