Tag: LEDs

LED tutorial

LED Basics

A tutorial on the basics of using LEDs (light emitting diodes). Polarity, forward voltage and current are discussed. 300 LEDs for $13 500 resistors for $12 Adjustable power supply

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White LED under microscope

White LED under microscope

There are 3 dies on every white LED in this LED module.

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RGB LED

RGB LED under microscope

Clear shots of all 3 dies in an RGB LED.

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Green LED turns red

Green LED turns red!

Normally rated for 20mA. When 100mA is flowing it turns from green to yellow. At 150mA, it slowly and permanently turns yellowy-orange. At 200+mA it permanently turns red and soon fails.

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Blue 0603 LED

Blue 0603 LED under microscope

Random video. The colour changes a bit as the current gets turned up.

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Transformers LED artwork

Here’s a piece of Transformers related artwork that I made a few years ago. If you ever watched the 80s cartoon show, you may like it. The hardware is pretty simple – it’s an array of LEDs in series, being PWM dimmed with a couple of transistors. An external 20V supply powers the whole thing. […]

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hand cranked LED flashlight

The world’s simplest hand cranked LED flashlight

This is a quick and easy hack – if you have an old inket or laser printer, it will have a stepper motor in it. By connecting an LED to the stepper motor, you can make a ghetto hand cranked flashlight.

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Pulse Width Modulation

What is PWM? Pulse Width Modulation Tutorial in HD

PWM circuits are fun. You can use them to dim LEDs, control the speed of fans and motors, control the power going to a thermoelectric cooler, or control the power going to pretty much anything you want. Just make sure that you don’t exceed the maximum voltage rating of your device. The video explains it […]

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