Archive for date: May 20, 2011

Improved Joule Thief Circuit

May 20, 2011 | electronics | By: Mark VandeWettering

While surfing for more LED information, I found this rather nifty little circuit on Electronic Design’s website. It’s a little Joule Thief-like circuit, but with enhanced efficiency (~80%) and it can drive white LEDs with rather large forward voltage drops. Archived for later…. Single Alkaline Battery Drives White LED.

DIY FET/home-made transistor Scientific American June 1970

May 20, 2011 | Amateur Science, electronics | By: Mark VandeWettering

When I was still in grade school, I (and this will be a shock to my readers) spent a lot of time in libraries. Our library used to have a free bin, where they would toss things that they no longer wanted in their collection. One day, I came by and found a pile of […]

A foxhole radio…

May 20, 2011 | Link of the Day | By: Mark VandeWettering

IRC and Minecraft buddies Atdiy and whisk0r have been doing some cool videos on making cigar box guitars, some kind of neural network stuff, and more recently: some introductory electronics videos. After winding inductors and making their own capacitors in previous episodes, they get around to making their own foxhole radio just using a blued […]

LED Transmitter Schematic

May 20, 2011 | electronics | By: Mark VandeWettering

Okay, so here’s the schematic for the LED transmitter circuit as I assembled this evening. I tried to write up an exposition of how it works, but frankly, it pales in comparison to the clarity and completeness of KA7OEI’s page. But here’s the basic idea: imagine that you supplied 1V to the input of the […]