How To Make A Secure keycode Activated Relay Circuit

Great circuit for activating a motor/light or door solenoid. VERY secure. Ripping out the keypad and playing with the wires will not activate the relay. Enter 1st 4 digits to activate the relay, and the full 5 digits to deactivate the relay.

Schematic here:

http://www.zen22142.zen.co.uk/ronj/k5.html

Thanks For Watching!

Please support this channel by SHARING, POSTING LINKS to my videos, SUBSCRIBING, and rating THUMBS UP. ... https://www.youtube.com/watch?v=laG_pGUpCKs