Category Archives: Fix me.

Things that needed repairing.

Mental illness in microcontrollers — or in the programmer ?

Posted on July 11, 2011 by robert

A while ago I thought it was time to re-implement my clumsy attempt to have some sort of communication between 3 microcontroller boards. It is half-duplex only, so that can’t be hard, can it? As the ATtiny24s don’t have a … Continue reading →

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I shall smite yee till kingdom come — Arrrrrr!

Posted on May 25, 2010 by robert

ENOUGH OF THIS INSANITY! In my previous post I described how and why I’ve temporarily wrecked my beloved power supply. Thankfully these 390mΩ 5W resistors are available. Right now I could only find 5% types, but ” bettar tan nottin’ … Continue reading →

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Failure by Design – My digital power supply

Posted on May 24, 2010 by robert

It’s a Voltcraft DIGI-35 CPU. So far I’ve been quite fond of it and given its age of more than 15 years rightly so I think. The markings on the PCB read: “CTC/91 DIGI-35″ and “18132 4350009427″. It’s the black … Continue reading →

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Floating voltages and bad GND connections — getting zapped and worse

Posted on August 12, 2009 by robert

Nothing good can come from a freak idea after mi….. Wait! This time I actually learned something, or in more pleasant words: I was reminded that there was something about floating power supplies, measuring voltages and something called ‘common ground’. … Continue reading →

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Jyetech AVR digital oscilloscope DIY KIT — trying to fix it – part 2

Posted on August 9, 2009 by robert

Maybe you remember my last post about the Jyetech oscilloscope and it’s weird behaviour. Not all of them are strange, as the free replacement DIY KIT I received from them works fine. At that time I suspected a sick ATmega64 … Continue reading →

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