Category: Power

Laptop Bench Power Supply

Many years ago (September 2009) I made a simple bench power supply using an LT1083 7.5A linear regulator with adjustable output voltage designed to be used with a 19.5V 3.42A laptop power supply. It still works fine after years of abuse, but my choice of output power connectors was poor (3 pin headers, the sort …

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USB Power Switch and Filter

What’s more annoying than having to pull the USB cable every 5 seconds to power cycle the project you’re working on? Especially when you’ve ran out of front USB ports and have to reach around the back of your PC. This project aims to make things a little bit easier by using a small push …

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A Lithium Battery Charger with Load Sharing

You may have found that charging your project’s lithium battery while at the same time trying to use your circuit didn’t quite workout, with problems like the circuit not turning on and the battery never finish charging. Even an LED can cause the battery to never finish charging. This article goes through creating a battery …

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Joule Thief

In case you’ve not heard of a joule thief before, they’re simple voltage boost circuits, usually used to drive light loads like LEDs with a single battery cell, even batteries that other electronic devices consider ‘dead’ can be used, [Wikipedia article]. I made 2 versions of the joule thief, the common one with a single …

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