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...
Car Fault Indicator Alarm
Here’s a car fault indicator alarm circuit that sounds an alarm if your turn indicator lamps doesn’t glow, helping you to safeguard against any accident...
Mains Box Heat Monitor
This simple mains box heat monitor circuit monitors the mains distribution box constantly and sounds an alarm when it senses a high temperature due...
LED Torch
LEDs are becoming increasingly popular in many lighting applications. White LEDs are now common in torches. Here’s a simple and economical LED torch that...
Laser Based Transmitter And Receiver
Using this laser based transmitter & receiver circuit you can communicate with your neighbours wirelessly. Instead of RF signals, light from a laser torch...