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Other alarm circuits

(Moisture alarm,Fridge door alarm,Frost alarm... )
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Car backup alarm
The breake light of the automatic trigger
(09-Sep-2005)---109

Daylight Alarm
The circuit presented here wakes you up with a loud alarm at the break of the daylight
(10-Sep-2005)---162

Door knob alarm
Door knob alarm with a single 40138
(08-Sep-2005)---5

Doorbell Ringer
Birdie Doorbell ringer
(09-Sep-2005)---107

Emergency Light and Alarm
This is Emergency Light and Alarm powered by two AA NI-CD batteries four switchable options
(08-Sep-2005)---13

Frost Alarm
The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius.
(08-Sep-2005)---10

Gate Alarm
Simple gate alarm based on CD4093 CMOS IC.
(10-May-2007)---936

Headlight Alarm
Headlight Alarm circuit
(09-Sep-2005)---118

Infrared Active Motion Detector
An Ambient-Light-Ignoring Infrared Active Motion Detector
(08-Sep-2005)---9

Micro-power over temperature alarm
Simple Micro-power over temperature alarm
(08-Sep-2005)---7

Personal Silent Alert system
Personal Silent Alert system via a Telephone Typewriter, or TTY
(08-Sep-2005)---8

Power supply failure alarm
This circuit can be used as an alarm for power supplies in the range of 5V to 15V
(10-Sep-2005)---152

Rain Alarm
This circuit gives out an alarm when its sensor is wetted by water.
(10-Sep-2005)---154

Refrigerator door alarm
This is a small Refrigerator door alarm.
(08-Sep-2005)---12

Relay Controller/Alarm Clock
Build a programmable relay controller for up to 8 relays, it even has an \"Alarm Clock\" with battery backup.
(13-Sep-2005)---340

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