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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...

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 Bell

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...

Chant Player

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

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

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...

Keychain Light

A keychain light with white LED comes in handy to help you at your front door or search your valuables in the dark. The...

PC Based Candle Igniter

Here’s a PC based candle igniter system that lets you light up a candle using matchsticks by just pressing the ‘Enter’ key on the...

Flashing Headlight for Motor bikes

The dipper for a vehicle’s headlight changes the light from high beam to low beam or vice versa given a particular set of road...
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