Tag: LM317

constant current source

Constant current source and laser / LED driver tutorial

An overview of constant current sources and how to build one out of an LM317. Examples are given where you can use a constant current source to drive a string of LEDs or a laser diode.

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How to Turn an Old UPS into an Alkaline Battery Charger!

I recently lost my collection of electronic components, and was looking for a cheap source of parts I could use in my projects. It turns out that my old, broken uninterruptible power supply was a goldmine of useful components! Check out the video to see what I found inside. It turns out that I had […]

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LM317 Adjustable Voltage Regulator Tutorial

A tutorial on the LM317 voltage regulator. Shows you how to make a 1.25 to 25V adjustable voltage supply, or choose any other output voltage you want. An example of a fan speed controller is shown. This video builds on material covered in the fixed voltage regulator tutorial so you should check that out if […]

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