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Loop Alarm

Loop Alarm

This alarm system was originally designed to protect the contents of a garden shed, although it would also be ideal for other outside buildings. In addition it would offer a good basic security system for small residential areas, such as flats and bedsits. It may be installed without drilling or attaching to the building, which could be an advantage in rented accommodation.

http://web-ee.com/schematics/electronic_projects/loop_alarm/

Grade Crossing Bell Ringer

Grade Crossing Bell Ringer

This is an updated version of an LM555 timer based - Grade Crossing Bell Ringer - circuit that was built for the London Model Railroad Group.

http://home.cogeco.ca/~rpaisley4/xBellRinger.html

5 Zone Alarm Circuit

5 Zone Alarm Circuit

http://www.zen22142.zen.co.uk/Circuits/Alarm/5zalm.html

Alarm control keypad

Alarm control keypad

http://www.mitedu.freeserve.co.uk/Circuits/Switching/keypad.htm

Anit Theft Motorcycle Alarm

Anit Theft Motorcycle Alarm

http://www.zen22142.zen.co.uk/Circuits/Alarm/motorcycle.htm

Basement doorbell beeper

Basement doorbell beeper

If you can't hear your doorbell when you are in your basement try this circuit.

http://www.imagineeringezine.com/PDF-FILES/doorbel.pdf

Birdie Doorbell Ringer

Birdie Doorbell Ringer

http://www.uoguelph.ca/~antoon/circ/birdie.htm

CMOS Single Zone Alarm

CMOS Single Zone Alarm

http://www.zen22142.zen.co.uk/Circuits/Alarm/csza.htm

Door knob alarm

Door knob alarm

http://www.discovercircuits.com/PDF-FILES/dooralm2.pdf

Doorbell with counter

Doorbell with counter

http://www.mitedu.freeserve.co.uk/Circuits/Switching/dbcounter.htm


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