Monthly Archives: February 2009

8×8 RGB Matrix V3 + KICAD + SMD — part 1

Posted on February 26, 2009 by robert

Now that I’ve started to work with KICAD, I’ve made the transistion to SMD parts and finally got my switch back. I hade to remove it in V2 as the DIP parts took too much space. The quartz is back … Continue reading →

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8×8 RGB Matrix V2 – KICAD test

Posted on February 24, 2009 by robert

I’ve converted the files to KICAD. Due to size limitations of my project housing (60x60mm), I had to remove one switch which was connected to Arduino pin 7. All code that uses “__button” should be removed. The remaining one is … Continue reading →

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Simulating a quadrature decoder with LTSpice and what has become of it

Posted on February 10, 2009 by robert

What is a quadrature encoder/decoder ? If you’ve ever used a mechanical computer mouse (yes the ones that get dirty and the pointer hangs), they’ve got 2 of these encoders in them. The whole purpose of them is to measure … Continue reading →

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Trying to fix the sound of my Sega Game Gear — part 2

Posted on February 6, 2009 by robert

I was lucky :-) It seems the guys at Sega just replaced the 470µF capacitors shown in the reference setup for the TDM2822M dual amplifier with 47µF ones. Other people have had problems with these too, so I just pulled … Continue reading →

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Trying to fix the sound of my Sega Game Gear — part 1

Posted on February 3, 2009 by robert

Last time I turned it on, I didn’t get the usual boot-up sound of ‘Seeeeegaaaaa’. There’s a little chip next to the earphone plug. I haven’t checked yet, but I suspect it’s some kind of amplifier. So I’ll warm up … Continue reading →

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