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Design Your Own Li-Fi Dongle And Speaker

Light Fidelity (Li-Fi) is a new paradigm in wireless communication. In this article, we describe the design of a Li-Fi dongle (transmitter) and speaker...

Battery Level Indicator Circuit Using LM3914

Battery level indicator indicates the status of the battery just by glowing LEDs. For example six LED’s are glowing means battery capacity 60% remains....

Automatic Plant Watering System with Melody

In our usual busy routine, one of the reasons for people hesitating to keep plants at their home is that people forget to water...

Laser Light Security Alarm

This article shows you how to create a DIY laser light security alarm, perfect for enhancing home security. The best part? It’s a simple project...

Simple Multi-Sensor Fire Alarm

The fire alarm circuit presented here raises an alarm on detecting flames and high temperatures. It can be used in two ways: A single...

Automatic Light and Overcharging Control With Voltage-Level Indicator

This circuit can be used for automatic light control and 6V battery charging. It monitors the battery level and switches to charging and overcharging...

Bi-Directional Motor Driver Using ULN2803

Motor driver modules for motors allow you to control the working speed and direction of two motors simultaneously. Here we present an alternative ULN2803...

Optical Theremin Musical Instrument Using Arduino Uno Board

Theremin is an early electronic musical instrument controlled without physical contact by the thereminist (performer). It is named after the Russian inventor, Léon Theremin,...

Multimeter Test Leads from Scratch

If you are an electronics hobbyist and need to measure low currents and low voltages, you can buy any inexpensive multimeter. However, test leads...

Touch Switch

Described here a touch switch circuit system that operates only when you touch two conductor terminals simultaneously with your fingertip.

Curtain Opener Circuit

Open or close the curtains of your house at the press of a switch. All you need is this electronic curtain opener. Meant for...

Super Simple Intercom

This intercom circuit based on IC LM380 audio amplifier requires very few external components. So the circuit is very easy to assemble. Intercom circuit Circuit diagram...

Water Pump Controller

Here is a simple water pump controller circuit for controlling the water level in an overhead tank. The main components of this pump controller...

Simple Sensitive Remote Control Tester

This handy remote control tester circuit for testing infrared-based remote control transmitters used for TVs and VCRs etc. The circuit is built around 7805 IC,...

Dew-Point Sensor Circuit

A dew sensor is used in sensitive electronic equipment like cameras and copiers, etc., to protect them from moisture failure by fast detection of...

Strain Meter

This strain meter shows whether the strain is compressive (reducing the length) or tensile (increasing the length) when an object such as a strut...

Linear Timer For General Use

This simple linear timer can be used to control any electrical appliance that needs to be switched off after a certain time, like a...

Laser Based Communication System

In this circuit, an electrical signal is transmitted from one place to another riding over the laser beam.
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