Two sensors are used in this simple remote-control circuit, one to switch on and one to switch off the relay. The circuit is from 1986 documentation. The transformer has 12 V of secondary.
The integrated circuit used in this 1986 project is not very common today. The circuit uses few...
This circuit controls a relay causing it to open and close its contacts at a speed that depends on the...
The circuit is from the MC1539 manual, an operational one close to the 741. The transistor admits...