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555 ic based touch alarm – Circuit Schematic
555 ic based touch alarm
Security has been a major issue in the present day world. And security gadgets of various nature are available today. Here I introduce a simple touch alarm that...
latest touch alarm system circuit – Circuit Schematic
latest touch alarm system circuit
C1/C2 operating voltage should be elevated to 25V if you decide to go with a 12V energy source. Rule of thumb: the operating voltage of capacitors are at least ...
Simple Siren – Circuit Schematic
Simple Siren
THE circuit shown provides a smooth, piercing, wailing siren with a minimum of components. Not only this, but three spare gates of hex inverter IC1 remain, whic...
Miniature loop alarm circuit – Circuit Schematic
Miniature loop alarm circuit
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I-button electronic lock circuit – Circuit Schematic
I-button electronic lock circuit
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Garageshed alarm circuit – Circuit Schematic
Garageshed alarm circuit
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Enhanced 5 digit alarm keypad circuit – Circuit Schematic
Enhanced 5 digit alarm keypad circuit
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Cmos 4060 burglar alarm circuit – Circuit Schematic
Cmos 4060 burglar alarm circuit
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Automatic intruder alarm circuit – Circuit Schematic
Automatic intruder alarm circuit
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light activated alarm – Circuit Schematic
light activated alarm
When enough light falls on the LDR in this circuit, an alarm tone is played on the loudspeaker. This tutorial shows beginners in electronics how to build the ci...
magnetic tampering – Circuit Schematic
magnetic tampering
Magnetic tampering technique is done by bringing a high powered magnet in close proximity of the domestic electricity meter. When this is done, the disc stops r...
laser trip wire circuit – Circuit Schematic
laser trip wire circuit
A replication of Afrotechmods laser tripwire circuit. Using a simple laser pointer, IRF244 MOSFET ( most NPN transistors would do the job), a couple of resistor...
Auto Shut Off Tone Generator – Circuit Schematic
Auto Shut Off Tone Generator
In this auto shut off tone generator project, once the switch to the 9V power supply is connected, the alarm will trigger at a frequency of approximately 1.27 k...
alarms and security related schematics – Circuit Schematic
alarms and security related schematics
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radio wave alarm – Circuit Schematic
radio wave alarm
This very simple alarm circuit is sure to have the police beating a path to your door - however, it has the added advantage of alerting you to their presence ev...
water activated alarm using ic 555 – Circuit Schematic
water activated alarm using ic 555
Probe/contacts may use a non-reactive metal. Gold or silver plated contacts from an old relay May be Used, however a cheap alternative is to wire alternate copp...
ic 555 motorcycle alarm circuit – Circuit Schematic
ic 555 motorcycle alarm circuit
Any number of normally-open switches may be used. Fit "tilt" switches that close when the steering is moved or when the bike is lifted off its side-stand or pus...
fm radio controller anti theft alarm – Circuit Schematic
fm radio controller anti theft alarm
This Circuit of FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted...
water sensor alarm circuit using ic – Circuit Schematic
water sensor alarm circuit using ic
This is a simple musical alarm circuit that produces a musical tone when water or some conducting liquid comes in contact with the 2 sensor wires provided. The ...
how to make electronic siren circuit – Circuit Schematic
how to make electronic siren circuit
The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors are off....