Technically it may seem impossible to illuminate a 3.3V LED with a 1.5V source, but the amazing concept of joule thief makes this look so easy and effective, and virtually unbelievable, moreover the circuit additionally makes sure that not a single drop of “joule” is left unused in the cell. A joule thief circuit is […]
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3D Moon-Sphere LED Driver with Charger and Dimmer
In this post we learn how to build a homemade LED driver with dimmer and charger circuit for illuminating a 3D moon from a 5V USB source. The idea was requested by Mr. John Sweden. Specifications and Features I’ve been a visitor to your website for many years and wonder if I may ask your […]
Joystick Controlled 2.4 GHz RC Car Using Arduino
In this post we are going to construct a car robot which can be controlled using a joystick on 2.4 GHz wireless communication link. The proposed project is not only made as a RC car, but you can add your projects such as surveillance camera etc. on the car. By Girish Radhakrishnan Overview The project […]
Mobile Phone Controlled Robot Car Using DTMF Module
In this project we are going to control a manual robot through our cellphone using DTMF module and Arduino. By: Ankit Negi, Kanishk Godiyal and Navneet Singh sajwan INTRODUCTION In this project two cell phones, one for calling and one for receiving the call are used. The phone receiving the call is connected to the […]
200, 600 LED String Circuit on Mains 220V
The post details the construction of a 200 to 600 LED project, using series parallel LEDs for creating an alphabetical display sign board. The idea was requested by Mr. Mubarak Idris. Let’s Make a Blinking 200 String LED Circuit I need a blinking LED light that show”WELCOME TO” blink and then “COLLEGE OF ENGINEERING” base […]
110V, 14V, 5V SMPS – Detailed Diagrams with Illustrations
In this post we learn how to apply the IC L6565 for making a compact multi purpose 110V, 14V, 5V SMPS circuit using minimum number of external components. Implementing quasi-resonant ZVS flyback The IC L6565 from ST Microelectronics is designed as a current-mode primary controller chip, to specifically suit quasi-resonant ZVS flyback converter applications. The quasi-resonant […]
7 Watt LED Driver SMPS – Current Controlled
The presented 7 watt LED driver circuit is an SMPS based non-isolated, transformerless circuit which ensures a safe current controlled output for the attached LED, it is very affordable to build without involving complex transformer winding. Constant Current and Load Regulation Objective The aim behind the design of the IC TPS92310 (from TEXAS INSTRUMENTS) is […]
LiFi Internet Transmitter – USB Signal Transfer through LED
In this post we learn how to transmit Internet data through LiFi using a class D amplifier as the transmitter and an ordinary audio amplifier circuit as the receiver. How Li-Fi Concept Works If you are wondering how a LiFi concept could be used for transmitting USB data, this article will provide with all the […]
Simple Solar LED Highway Lighting System
The discussed circuit for a simple solar LED street light system is specifically designed for the new hobbyist who can build it simply by referring to the pictorial schematic presented here. Due to its straightforward and relatively cheaper design the system can be suitably used for village street lighting or in other similar remote areas, […]
Stepper Motors – Detailed Step by Step Explanation
In this post we are going to learn about stepper motor. We will be exploring what stepper motor is, its fundamental working mechanism, types of stepper motor, stepping modes, and lastly its advantages and disadvantages. By Girish Radhakrishnan What is stepper motor? Stepper motor is brushless motor; its rotating shaft (rotor) completes one rotation with […]
Greatest Myths about LED Lighting
LED lighting products are relatively new for the commercial market and as with any new product, they have to deal with doubt and negative comments from consumers’ side. There just is a lot of false information about LED lights that creates many misconceptions about them. So here are the greatest myths about LED lamps and […]
Controlling LED Strip Light ON/OFF and Brightness with any Remote Control
In this post we are going to construct LED strip controller circuit using Arduino, which can turn ON/OFF and decrease/increase brightness of LEDs using ordinary IR (Infrared) remote. By Girish Radhakrishnan What is LED Strip Light? (For noobs) If you are not familiar with LED strip lights, let’s understand what it is. LED strips (sometimes […]
Remote Controlled Solar Lamp Intensity Controller
The post details a simple remote controlled solar lamp intensity controller circuit which can be used for controlling the street lamp LED intensity without practically reaching for the LED box. The idea was requested by one of the dedicated members of this website Circuit Objective I have successful build this current controlled driver circuit with […]
10 LED Tachometer
The post explains how an accurate 10 LED tachometer circuit can be built using ordinary parts like IC 555 and IC LM3915. The idea was requested by Mr. Munsif. The Design A simple 10 LED tachometer circuit can be seen in the above diagram. The circuit basically consists of two mains stages. A monostable based […]
How to make a Remote Controlled Game Scoreboard
The post explains how to build a simple remote controlled game scoreboard circuit with two digits for facilitating the user a hassle free changing of the digits remotely, during a game or a match. The idea was requested by Mr. Richard. Digital Scoreboard for Volley Ball Game For our co-ed volleyball game we use manual […]
How to Make LED Air Pollution Meter
In this project we are going to construct an air pollution meter using MQ-135 sensor and arduino. The pollution level in the air is indicated by series of 12 LED. If higher the number of LEDs glows, the higher the pollution content in the air and vice versa. By: Girish Radhakrishanan Overview This project can […]
Solar Pocket LED Light
The post explains a simple low cost solar pocket LED light circuit which could be used by the needy and, underprivileged section of the society for illuminating their houses at night cheaply. The idea was requested by Mr. R.K. Rao Solar Powered LED Table Lamp I want to make a SOLAR pocket LED light using […]
“WELCOME” Chasing LED Display
The post explains how to make a chasing “WELCOME” display circuit sign board, which illuminates each alphabet sequentially until all the 7 alphabets are lit and then the whole display shuts off, the cycle continues permanently as long as the circuit is powered. Overview I have already discussed a similar concept explaining a bar graph […]
Sunrise Sunset Simulator LED
In this post we learn how to make a sunrise/sunset simulator circuit using LEDs and just a couple of BJTs. The idea was requested by Mr. Jerry Artificial Dawn/Dusk Light Effect Generator Apparently natural daylight is best for humans in regulating our circadian rhythm. I would like to build an LED lighting circuit to control […]
How to Design a Solar Inverter – Detailed Tutorial with Diagrams
Designing a solar inverter circuit essentially requires two parameters to be configured correctly, namely the inverter circuit and the solar panel specs. The following tutorial explains the details thoroughly. Building a Solar Inverter If you are interested to build your own solar inverter then you ought to have a thorough knowledge of inverter or converter […]