Category Archives: Electronics

Brian’s electronic tutorials, experiments and projects

Repair of Samsung LE40M86BD Television (power cycling)

Introduction Recently I have had cause for complaint with our Samsung LE40M86BD LCD Television.  It had been working just fine, and then all of a sudden it developed a power-cycling problem.  The symptom is as follows: From power-on, the TV … Continue reading

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Sorting out the Velleman MK170 Christmas Star

Last Christmas I bought a Velleman MK170 Christmas Star project for my Wife to build.  She often shows interest in my various electronics projects and I thought it would be a good way for her to build something that she … Continue reading

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Simple circuit for controlling LED brightness

Recently I was asked to produce a circuit to create a variable ‘dim’ control for an existing LED based exhibition. I decided to go with a simple 555-timer based design which provides control of the pulse width of an output, … Continue reading

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Install Freerouting on Ubuntu 14.04 – 16.04

Introduction Freerouting was a web application created and maintained by Alfons Wirtz at his website, here.  It allowed us to import a design file from kicad and then auto-route the project based on some design preferences.  It was basically a … Continue reading

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Happy Valentines Day Project

Happy Valentines Day! A few years ago I created a little valentines day project, shown in the video at the end of this post.  It’s basically just a multi-vibrator circuit with two groups of LEDs, arranged as an inner and … Continue reading

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Panasonic AE700 Projector Diagnosis & Repair

In the tinkering cave this week we have a Panasonic AE700 HD Projector. These units are pretty old now, but they come highly recommended in many online reviews and the HDMI support means they remain a useful home cinema option. … Continue reading

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Installing daily build of KiCAD [Ubuntu]

I noticed, recently, that KiCAD footprint libraries now carry the .pretty extension, and that these files cannot be read by the latest stable release of KiCAD.  In order to make use of these libraries it is necessary to install a … Continue reading

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