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Light Fence Security Alarm Circuit Schematic – Circuit Schematic
Light Fence Security Alarm Circuit Schematic
A simple light fence security beeper is presented here. This circuit can be used as a door alarm, gate alarm, pathway alarm, etc. Any 12 Volt dc power supply ca...
Power Resumption Alarm circuit – Circuit Schematic
Power Resumption Alarm circuit
Here is a simple power resumption alarm circuit that can be fixed inside the switch box itself. It gives beeps when the power resumes after a power failure.....
High Temperature Alarm Circuit – Circuit Schematic
High Temperature Alarm Circuit
The high temperature alarm will beep and LED blinks when the temperature of the device increases abnormally. This simple over heat alarm is to monitor heat.....
Remote Controlled Alarm circuit – Circuit Schematic
Remote Controlled Alarm circuit
A very interesting remote controlled alarm circuit using TSOP1736. Routing of an electric cable to attach a calling bell switch near the bed of an old age/patie...
Invisible Infrared Alarm Circuit – Circuit Schematic
Invisible Infrared Alarm Circuit
This circuit uses invisible infrared light to detect the movement of people through the door. A short beep will be generated when the infrared beam breaks ...
Door Ajar Alarm Circuit – Circuit Schematic
Door Ajar Alarm Circuit
Ever accidentally left your front door ajar and had a pet escape Here is a smart solution to this problem. The circuit is fairly simple but a great example of u...
Overflow Indicator Circuit – Circuit Schematic
Overflow Indicator Circuit
This Simple circuit can monitor overflow of water from the Overhead tank. The sensor placed close to the lid of the overhead tank always monitor the presen.....
Power Switch with Infrared Proximity Sensor – Circuit Schematic
Power Switch with Infrared Proximity Sensor
The power switch with infrared proximity sensor is intended for the recognition of obstructions at distances of a few millimetres to a few centimetres. Thi.....
Wire Break Sensor Alarm Circuit Schematic – Circuit Schematic
Wire Break Sensor Alarm Circuit Schematic
Circuit of a loop sensor based simple security alarm is described here. The sensor loop is nothing but a short length of thin enamelled copper wire, which.....
Pressure Sensor Alarm Circuit Schematic – Circuit Schematic
Pressure Sensor Alarm Circuit Schematic
The simple pressure sensor alarm is built around a couple of readily available cheap components. Working of this circuit is straight forward and self-explanator...
PIR Sensor Security Light & Switch – Circuit Schematic
PIR Sensor Security Light & Switch
Moderately priced Passive Infrared PIR Sensor modules are now widely available. By using these readymade and pre-configured PIR sensors, even an average el.....
PC Watcher | Turn On and youll hear the Alarm – Circuit Schematic
PC Watcher | Turn On and youll hear the Alarm
This little PC Watcher circuit will help you to prevent unauthorised access to your personal computer. After construction on a small piece of veroborad, en.....
Ultrasonic Dog Repeller Circuit – Circuit Schematic
Ultrasonic Dog Repeller Circuit
This ultrasonic dog repeller circuit will chase away angry dogs. It is build with the all known 555 circuit, a buzzer and a little ferrite transformator. T.....
Tilt Sensor Alarm Circuit – Circuit Schematic
Tilt Sensor Alarm Circuit
Ultra simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true transistor ...
Temperature Monitor with Alarm – Circuit Schematic
Temperature Monitor with Alarm
This temperature monitor alarm circuit continuosly monitors the room temperature and beeps when the temperature drops below 20 degrees centigrade. This capabili...
Electronic Siren Circuit – Circuit Schematic
Electronic Siren Circuit
The DIY Electronic Siren circuit described here can create three different US-style siren sounds: DIY police, DIY ambulance and fire engine. The desired sound c...
Bike Guard Alarm Circuit – Circuit Schematic
Bike Guard Alarm Circuit
This Simple circuit can be used to Guard your bike from theft. It gives a loud alarm tone if somebody tries to start the bike. The alarm disables only when the ...
Fridge Door Alarm Circuit – Circuit Schematic
Fridge Door Alarm Circuit
This fridge door alarm is using a 3V battery supply should be placed (in a small box) in the fridge near the lamp or close to the opening. With the door cl.....
Water Sensor Alarm Circuit – Circuit Schematic
Water Sensor Alarm Circuit
This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of ...
Telephone Guard Circuit – Circuit Schematic
Telephone Guard Circuit
Here is a simple circuit to protect your Telephone, EPBAX, Telephone Modem etc from lightning discharge or line spikes. It uses a safety capacitor and Gas.....