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wire break alarm

Wire Break Alarm With Delay

Here is a simple circuit of wire-break alarm that activates after a delay of 15 to 30 seconds. When the thin-wire loop running across the entrance door is broken, the alarm sounds after a delay of 15 to 30 seconds, the time period set through VR1.
simple low power inverter circuit

Simple Low Power Inverter

Here is a simple low power inverter that converts 12V DC into 230-250V AC (DC to AC Converter). It can be used to power...

Long-range Burglar Alarm Using Laser Torch

Burglar alarm using laser torches, normally work in darkness only. But this long-range photoelectric alarm can work reliably in daytime also to warn you...
8 Digit Code Lock for Appliance Switching

8 Digit Code Lock for Appliance Switching

This 8 digit code lock is useful for appliances requiring exclusive or authorised use by those who know the preset code. If desired, the...

Window Charger

Keep away intruders with this compact electrified window charger. The charger produces non-lethal shocks that are strong enough to threaten intruders. Window Charger Circuit The circuit...

Anti-Theft Alarm for Vehicles

This simple and inexpensive anti-theft alarm circuit for vehicles sounds an alarm simulating a police siren whenever someone attempts theft of your vehicle. The...

Micro-Power Flasher

With this micro-power flasher you can baffle the intruders trying to break into your home. The unit continuously emits flashing light both during day...

LOW CURRENT, HIGH VOLTAGE POWER SUPPLY

A high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and...

Little Door Guard

If some intruder tries to open the door of your house, this circuit sounds an alarm to alert you against the attempted intrusion. The circuit...

Glass Break Alarm

This circuit can be used for sounding an alarm to detect the breaking of a glass window by an intruder, even when the intruder...