Tag Archives: electronics

Drawing digital timing diagrams, AKA logic level diagrams

So far I’ve found these: the first-google-result TimeGen, shareware; TimingTool, a shareware online java applet; Xwave, Joseph Palmer’s font; TimingFont, another one.

KiCAD’s PCBNEW: change pad dimensions

Don’t get confused by the “Tracks and Vias” menu: it’s just that, tracks and vias. To change pad dimensions: select one pad; change it’s dimensions; right-click it, select Pad N -> Export Pad Settings; now right click any pad of every element you want to have the same pad sizes, go Pad N -> Global [...]

Making my own USBasp programmer

I’ve been trying to make some for the last two weeks (yes, two weeks). I didn’t use the provided designs, that’s why it took so long: first, I wanted to get apprehended with the UNIX electronics CADs; then, as one should expect, I ran into design trouble of a layout that hasn’t been tested. So [...]

First tryout of AVRs

I bought a few programmers some time ago. On eBay, for around 16 dollars american. They’re a copy of Thomas’ Fischl’s USBasp. Now I’m toying around with them – a part of my summer internship. First off, I tried connecting one working programmer to the other and see how it goes. Well, FreeBSD couldn’t recognize [...]

Installing kicad: tr: Illegal byte sequence

Tr – “translate characters” – is an utility from the base distribution of FreeBSD. Thus in order to update it, you need to rebuild the base system. You can read some info on that, or just search the Googles. Quick hint: if you don’t want to build games, read man src.conf. It’s a new feature [...]

Nope, think again

Of course, Newsfox had to freak out on Windows. Switched to RSSOwl version 1. Now that’s supported on both platforms. I’ve slept 4 hours last night, and it wasn’t the healthiest sleep. Getting up at 7 or so tomorrow to be at an environment-preservation event. P.S. Nah, I didn’t go. Instead, I’ve finished the portable [...]

PCB etching notes

check that you’ll have enough time to make the board – two hours at least; see that holes are more than the diameter of the drillpiece – say, a 1,5 mm hole for a 1,0 drill; it is better to drill the holes before etching, otherwise the copper rings around the holes might flake off [...]

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