Faraday’s Guitar
Experimenting with the fundamentals of electrical and electronics is always interesting. Presented here is an electronic circuit that demonstrates Faraday’s law of electromagnetic induction...
Bhajan and Mantra Chanting Amplifier
People in India like to chant various mantras as they believe it brings good luck, peace of mind and helps in concentration. Here we...
Infrared Proximity Detector
This infrared proximity detector using an infrared detector can be used in various equipment like automatic door openers and burglar alarms. Check it out...
Auto Reset Proximity Detector
Electrochemical processes taking place in our body generate complex signals (hum) that are continuously being passed along the nerve fibres throughout the body. Any...
Long-Range IR Transmitter
Most of the IR remotes work reliably within a range of 5 metres. The circuit complexity increases if you design a long range IR...
Telephone Receiver
Ever wondered how the old telephones used to work? find out here. This is a circuit for a telephone receiver without a dialling section. It consists of a ringing section and a condenser mic.
Mobile Phone Battery Charger
Mobile phone charger available in the market are quite expensive. The circuit presented here comes as a low cost alternative to charge mobile telephones/battery...
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...
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...