Burglar / Security Electronic Circuits, page 4


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Security Circuits - including Burglar Alarms, Page 4
Security Burglar Alarms: #'s - D E - L M - S T - Z
Last Updated on: Friday, August 29, 2008 02:34 PM

Circuits Designed by Dave Johnson, P.E. :

Wire Security Loop Alarm
A wire loop is used to protect valuable objects in this alarm circuit. The circuit is powered by a 9v battery.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Timed Burglar Alarm: This is a simple but effective alarm circuit which can reset its self after a time that you select. it has normally open and normally closed triggers which make this circuit very practical. This alarm has normally open and normally closed triggers. It's on a 555 timer so the alarm will reset it's self after a certain amount of time. The time is adjustable with the variable resistor in the circuit. The alarm has a reset switch which you can replace with a key switch to make it more secure, and you can change the triggers to other types of door or window switched too. The alarm uses a relay which is connected to a siren but you can replace the siren with whatever you want. The circuit is running off 9VOLTS but can range from 4V 16V. (added 11/06)

TinyTwo Zone Alarm: (circuit / schematic added 2/03)

Touch Activated Alarm: (circuit design added 8/03)

Ultrasonic Remote Control and Alarm: (circuit design added 8/03)

Wire Loop Alarm: (circuit design added 8/03)

Security Burglar Alarms: #'s - D E - L M - S T - Z