We found this circuit in the 1983 Radio Electronics Special projects magazine. The components are common, and the circuit drives a relay. The power supply must be isolated.
The basis of this project is a three-position lever switch or similar. When the switch is in the...
This physical line servo control uses components that are not currently common. The circuit is from...
This circuit was found in a Popular Electronics from the 90's. The power transistors must be...