Mini Project: Guitar Amplifier (old!)

Playing guitar and electronics have been two of my favourite things for a long time now. When I was about 14, I combined these two for the first time and built a pretty simply 32W amplifier. While the design is super simple, it actually has a really nice clean tone and does not distort the sound at all. It’s capable of diving an 8 ohm or 4 ohm load. Today I decided to give it a bit of a clean and check if it still worked.

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Mini Project: Reverse Engineering the Samsung Galaxy S2 Touch Screen Interface

This is my last year at university studying for my Masters degree, hence the lack of posts this year – I’ve been pretty busy. My final project involves working with touch screens to improve the signal quality through hardware based processing and the more data I can get, the better. My hope was to intercept the touch screen on a mobile phone to see if I could get to the raw data. I knew that it probably wouldn’t work out that way because most of processing would probably be done by the touch screen controller (TSC) but I thought I’d have a go anyway – a challenge is always fun.

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Something that has been annoying me for a while is that there is no way to download your stats from the website!

So I wrote a script in python to allow you to download all of your stats into a spreadsheet. Here is the guide.

Basically, you need to provide the script with an example XML Http Request (XHR) where the website is pulling stats data from the server. From this XHR, the script then reconstructs a new XHR to get all of the data.

Mini Project: 555 Timer Servo Control

While I wait for parts to arrive for another project, I have decided to fill the time by building a few common circuits that I have never really investigated, even though I know the theory.

One thing that I have never really investigated is the 555 timer chip, despite being a very common “jelly-bean” part. The circuit I built allows a you to control the position of a servo motor by turning a potentiometer – ie, a 50% turn of the potentiometer would result in (approximately) a 50% turn on the servo.

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