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4 in 1 burglar alarm
this circuit, the alarm will be switched on under the following four different conditions
---158
Alarm circuit base on LM555
Two tone alarm circuit based on dual LM555.You can replace with single LM556.
---932
Automatic Intruder Alarm
This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays and a timed Bell/Siren Cut-Off. It\'s designed to be used with the usual types of normally-closed input devices such as - magnetic reed contacts
---813
Car anti theft wireless alarm.
This FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system.
---160
DIY Burglar alarm
Here\'s a pretty simple burglar alarm you can make and toss in your car/desk drawer/whatever, it uses the handy dandy 555 timer chip... - \"In this auto shut off tone generator project, once the switch to the 9V power supply is connected, the alarm
---904
Timed Burglar Alarm
This is a simple but effective alarm circuit which can reset its self after a time that you select
---167
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