3-way control (CB7047E)

This is a simple circuit to control a set of lamps from 3 different points. We found it in an old Popular Electronics.

Greenhouse Robot (CB16491E)
This circuit from a 1988 documentation uses an NTC sensor to keep a greenhouse temperature...
Regulated Inverter (CB5145E)
The power transistors of this 80's circuit should have at least 10 A current collector and mounted on...
Shield for isolated motor (CB25494E)
This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of...