1 articles written by Riju Thazhathuveettil

Author: Riju Thazhathuveettil

About: freelance electronics circuit designer, electronics is my passion


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 [...]