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Laser Communication System

This laser communication system transmits sound or music signals through a laser beam. The intensity of the laser beam changes with the amplitude of...

Mini Candle Light Using Old Mobile Phone Battery

According to the three Rs—reuse, reduce and recycle—we must save our planet from e-waste. Sometimes we have a dead mobile phone whose battery is...

Get started with NOT Gate IC | 7400 Series Tutorials

NOT Gate Logic Symbol and Boolean ExpressionTruth Table for NOT gate ICRecommended Operating Conditions of NOT Gate IC 7404Pin-Out Diagram of 7404 NOT Gate IC7400...

TINY DEW SENSOR

Dew (condensed moisture) adversely affects the normal performance of sensitive electronic devices. A low-cost circuit for a dew sensor described here can be used...

Contactless Battery Charger

These days mobile phones with contactless charging are readily available. The circuit shown here explains how contactless charging of a battery can be done,...

Vibration Sensor

Presented here is a sensitive alarm using a vibration sensor for application as a simple surveillance system for protecting doors and windows. It can...

Water Level Indicator with Alarm

Here is a simple, versatile circuit which indicates the level of water in a tank. This water level indicator alarm consists of twelve levels....

Dual-Laser Security System Using An Old Feature Phone

A security system having a single laser beam may not be very effective as any moving object or animal can interrupt it, causing a...

Water Level Indicator

Here’s a simple water level indicator for overhead tanks that uses three LEDs (LED1, LED2, and LED3) to indicate minimum, middle, and maximum water...

Sound Operated Timer

This sound operated timer is based on LM324 quad-operational amplifier and NE555 timer. Time delay can be set from a few seconds to 30...

555 Timer PWM Audio Amplifier

The “555” integrated circuit is a general-purpose timer useful for a variety of functions. In this 555 audio PWM project, we explore its use...

IR Remote Control for Home Appliances

Most remote controls around us, use IR for signal transmission. An IR remote control for home appliances helps you connect to your decices at...

Mobile Charging With Heat Using A TEG Module

This circuit can come in handy when you are camping in a remote area where there is no electricity available to charge your mobile...

Hybrid Solar Charger

Efficiency of a solar charging system depends on the weather conditions. Usually the solar panel gets four to five hours of bright sunlight in...

Remote Control for Toy Car

Make any battery-operated toy car remote controlled using this circuit. This remote controlled toy car circuit, consisting of an infrared transmitter-receiver pair, uses IR...

Noise Level Alarm

Noise is a serious environmental problem that affects us in our daily life. There is scientific evidence supporting that noise exposure can cause hearing...

Voice Recorder and Playback System

There are several types of voice recorder and playback systems available in the market but most of them are expensive and their circuits are...

Low Power Voltage Doubler

All miniature electronic devices operate off batteries. Some of them need higher than the standard battery voltages to operate efficiently. If the battery of...
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