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LED Based Reading Lamp

This LED based reading lamp circuit uses ultra-bright white LEDs to provide sufficient light for reading while consuming approximately 3 watts of power. In the case of AC mains failure, the battery backup circuit instantly lights up the LEDs.

Anti Bag Snatching Alarm

Here is a simple anti bag snatching alarm circuit to thwart snatching of your valuables while travelling. The circuit kept in your bag or...

Simple Digital Security System

You can use this simple and reliable digital security system as a watch dog by installing the sensing loops around your building. You have...

Remote Controlled Power-Off Switch

The remote controlled power-off switch circuit given here can disconnect the entire system from mains using the remote for the audio or video systems. This circuit uses a remote control to switch off electrical appliances by the help of a infrared receiver module.

Touch Free Timer Switch

This type of infrared proximity circuit is widely used as an electric switch where physical contact is not desired for hygiene purpose. For example,...

PIN Diode Based Fire Sensor

Here is a PIN diode based fire sensor that activates an alarm when it detects fire. Thermistor based fire alarms have a drawback; the...

Optical Smoke Detector

This optical smoke detector uses a low-cost, readily-available, slotted, through-scan, infrared photo-switch. When smoke is detected, the relay energises to activate the audio/visual warning...

How to Make Flashing LED Light

An LED flashing at the doorstep of your garage or home will trick the thieves into believing that a sophisticated security gadget is installed....

Auto Snooze for Digital Alarm Clocks

Alarm clocks are made to wake you up. However, it is quite bothersome to hear the alarm continuously until you get up and put...

Ding-Dong Doorbell Circuit

A doorbell is a signalling device typically placed near a door to a building's entrance. When a visitor presses a button the bell rings...

Mantra Chanting Player Circuit

Chanting combines singing and music with mantras. The sweetness of chanting stills the mind, dissolves worries and opens the heart. Chanting forms an integral...

Electronic Street Light Switch

Here’s a simple and low-cost street light switch. This switch automatically turns on the light at sunset and turns it off at sunrise. The...

Twilight Blinker Lamp

During sunset or sunrise, the ambient light is not adequate to lead you through the open doorway or make your way around obstructions. To...

Multipurpose White LED Light

Standard fluorescent lamps and their smaller versions called compact fluorescent lamps (CFLs) radiate light in all directions (360°) and tend to increase the room...

Noise Meter

Normally, sound intensity up to 30 dB is pleasant. Above 80 dB, it becomes annoying. And if it goes beyond 100 dB, it may...

Automatic Heat Detector Circuit

This automatic heat detector circuit uses a complementary pair comprising NPN metallic transistor T1 (BC109) and PNP germanium transistor T2 (AC188) to detect heat...

Musical Alarm Timer

A timer is a specialised type of clock for measuring time intervals. Here we present a simple musical alarm timer that can be used...

Low-Cost Hearing Aid Circuit

Commercially available hearing aids are quite costly. Here is a low-cost hearing aid circuit that uses just four transistors and a few passive components. On...
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