electronic door release


Posted on Feb 7, 2014

This circuit is designed to operate an electrical door-release mechanism - but it will have other applications. When you enter the four-digit code of your choice - the relay will energize for a preset time period. Use the relay contacts to power the release mechanism. The standby current is virtually zero - so battery power is a realistic option..


electronic door release
Click here to download the full size of the above Circuit.




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