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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...

Hit Switch Circuit

This versatile hit switch circuit is the electronic equivalent of a conventional switch. It can be used to control the switching of a variety...

Electronic Thermostat For Fridge

An electronic thermostat is a standard equipment for sensing the temperature of a system and maintaining it at a pre-defined point. It is a...

Simple Touch Sensitive Switch

A touch switch is a type of switch that only has to be touched by an object to operate. It is used in many...

Infrared Motion Sensing Relay Switch

This IR motion sensor relay switch circuit is designed for use with all kinds of medium-power automobile/domestic 12V DC loads...

Infrared Remote Control Timer

Presented here is a infrared remote controlled timer circuit. The circuit comprises two sections, namely, the transmitter section and the receiver section. Fig. 1...

Simple Video Amplifier

There are times when you want to view the video clips taken by your camera on your TV. You can do so by interfacing...

Electric Shock Gun

This is a fantastic circuit for self-protection. In case a burglar intrudes your house, you can use this electric shock gun as a weapon...

Sound Scanner

This novel sound scanner sweeps all sound vibrations in its vicinity and converts them into audible beeps. It can sense sound vibrations up to...

Simple Smoke Detector

This simple smoke detector is highly sensitive but inexpensive. It uses a Darlington-pair amplifier employing two npn transistors and an infrared photo-interrupter module as...

Economical Pump Controller

This automatic pump controller eliminates the need for any manual switching of pumps installed for the purpose of pumping water from a reservoir to...

0-100°C Temperature Detector

Here’s a temperature detector system capable of remote temperature reading without transmission losses in the conditioning circuit. The IC AD590 (IC4) is used as...

Intruder Detector Using Laser Torch

Here is a simple, low-cost intruder detector using laser torch to detect the intruder. The laser beam is produced using a 3V DC or...

Low-Cost Hearing Aid Using IC 741

This low cost hearing aid circuit offers the advantages of high sensitivity, low current consumption and light weight. Audio signals are sensed by the condenser...

Digital Thermometer

This digital thermometer can measure temperatures up to 150C with an accuracy of +_1C. The temperature is read on a 1V full scale-deflection (FSD)...
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