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1 articles written by Riju Thazhathuveettil

Author: Riju Thazhathuveettil

About: freelance electronics circuit designer, electronics is my passion

Website: http://technonics.blogspot.in/

door opening alarm circuit

Door Opening Alarm with Sound Alert

Riju Thazhathuveettil - 08/14/2014

The door opening alarm circuit or “Front Office Visitor Alert” is used for alerting you when a customer [...]