## Lighting LED Using Raspberry Pi and Python

Lighting LED using Raspberry Pi To lighting LED using Raspberry Pi we first need Python GPIO. In my previous post on Raspberry pi we have installed raspbian. Next thing is to start experimenting on it. In this post we will see how you can setup your pi to run Python and create your first Project. As a first step we […]

## LED Jar – Weekend Project

LED JAR This is the simplest LED light. It uses a Nokia BL-5C battery, 3W LED and Li battery charger.   For step by step guide refer the following URL http://www.instructables.com/id/Ultrabright-LED-Emergency-Lamp/

## AC LED Light

Circuit Diagram for AC LED Light Resistor=240v -( Number of LEDs *3.3)/0.015 A         =240 – (41*3.3)/0.015 A =7000 Ohms Either use 6.8k or 7.1 K with power rating of 7-10 watt or 4*2.1 k 2watt Suggested Layout for AC LED Light Steps Take any old CFL lamp and cut open it. Remove the circuit out […]

## Making a big LED Lamp

This project uses 12 v dc  power supply with 18 LEDs. Also, instead of having series resistor for each LED, the LEDs are grouped in series of 3 LEDs.

## LED Driver using 7805 and LM317

LED Driver using 7805 The 7805 can be converted into a content-current device by connecting a resistor as shown below.   As the 12v rises from 0v, the 7805 starts to work and when the input voltage is 4v, the output is 1v as a minimum of 3v is lost across the 7805. The voltage rises […]

## LED Torch with adjustable brightness

The Led torch with adjustable brightness circuit uses LM3914 as the basis of a 10 step variable brightness current-regulated white LED . This circuit has only four components in the control and regulation circuit: R1,R2, VR1 and LM3914. Part List 1. IC – LM3914 2. LED1-10 – 10 white led 3. R1 – 620 ohm 4. […]

## Mains Powered LED Lights

All mains powered LED circuits work with 240 volt AC current. Mains powered LED – Single LED The power diode in the first diagram is designed to discharge the 220n during one half of the cycle so that the capacitor will charge during the other half-cycle and deliver energy to the LED. The 1k resistor […]

## White LED on 1.5 v Supply

In this post you will find circuit on how we can light up white LED on 1.5 v supply. Heart of the circuit is the transformer winded on 2.5mm by 0.5 mm core using 0.095 mm wire. 2 White LED on 1.5 v Supply The circuit below uses only 1.5v to light up 2 white […]