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siren alarm circuit diagram usng lm358 – Circuit Schematic
siren alarm circuit diagram usng lm358
When the switch is pressed C3 charges up through R4 with a time constant of 0. 47 seconds and when the switch is released C3 begins a slower discharge through R...
cheap fire alarm circuit – Circuit Schematic
cheap fire alarm circuit
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fake car alarm light – Circuit Schematic
fake car alarm light
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burglar alarm using ic timer 555556 – Circuit Schematic
burglar alarm using ic timer 555556
circuit of burglar alarm using IC timer 555/556 is functioned as an alarm to prevent thief entering your house. The alarm would produce loud sound when a thin w...
battery low voltage buzzer – Circuit Schematic
battery low voltage buzzer
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plant watering alarm – Circuit Schematic
plant watering alarm
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turret diy – Circuit Schematic
turret diy
For maximum mini-security this RC Tupperware Turret packs a powerful punch. It may not have motion sensors, but food thieves will still think twice before swipi...
simple tiny door guard – Circuit Schematic
simple tiny door guard
This simple Door Chime protects the door and gives a loud Alarm tone when there is an attempt of theft. The circuit is too simple and battery operated. A Normal...
auto alarm schematic – Circuit Schematic
auto alarm schematic
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electronically designed siren – Circuit Schematic
electronically designed siren
The circuit was designed to create an electronic siren to provide a scheme for producing an alert sound in emergency cases or any circumstances that requires it...
Buzzer – Circuit Schematic
Buzzer
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hacks n mods cia clock intruder alarm – Circuit Schematic
hacks n mods cia clock intruder alarm
Abstract Can you remember the movie Entrapment wherein the lead actress (Katherine Zeta Jones) tried to defeat the security of the building to get a very valuab...
stealth action motion sensor system – Circuit Schematic
stealth action motion sensor system
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stealth action laser tripwire system – Circuit Schematic
stealth action laser tripwire system
With these, you can make your very own security system that gives intruders a sporting chance! It`s the laser-version of saying But before I kill you, Mister Bo...
simple low cost digital code lock – Circuit Schematic
simple low cost digital code lock
In those circuits a set of switches (conforming to code) are pressed one by one within the specified time to open the lock. In some other circuits, custom-built...
proximity alarm circuit – Circuit Schematic
proximity alarm circuit
Inverters U1a and U1b are connected in a simple RC oscillator circuit. The frequency is determined by the values of R1, C1 C2 and the internal characteristics o...
mobile incoming call indicator – Circuit Schematic
mobile incoming call indicator
This circuit can be used to escape from the nuisance of mobile phone rings when you are at home. This circuit will give a visual indication if placed near a mob...
keep your property where you can see it – Circuit Schematic
keep your property where you can see it
A safe home is a happy one, but many off-the-shelf surveillance cameras are too expensive or simply impractical for home use. That`s why designer Alberto Ricci ...
electronic hotel door vulnerability using stealth lock circuit – Circuit Schematic
electronic hotel door vulnerability using stealth lock circuit
The word "pentester" actually stands for penetration tester, people who tests security vulnerabi. Most of the high-end hotels around the world rely on keycard l...
gsm gps based vehicle theft control – Circuit Schematic
gsm gps based vehicle theft control
This project deals with the design and development of theft control system for automobile, which is being used to prevent/control the theft of a vehicle. The de...