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Elecrow PCB prototyping

Filed under: Uncategorized — Tags: , , , , , — admin @ 2014/03/23 23:20

Another quick PCB manufacturer review. This time it was an audioohmmeter sent to Elecrow PCB service. Price was $9.90 + $3.72 shipment. I ordered 5 pieces, got 10. Nice! Overall quality looks very good. Lets see it in details. (more…)

Xubuntu upgrade to 13.10 with troubles

Filed under: Uncategorized — Tags: , , , , , — admin @ 2014/03/18 19:15

New (X)Ubuntu switched to systemd and it brought new challenges with upgrading. I use Xubuntu fork but this might affect others as well. I can’t turn off or hibernate the computer. Even after logout there are no buttons for powering off. And I can’t access NetworkManager. (more…)

Windows 8 SDK

Filed under: Uncategorized — Tags: , , , , , , , , , — admin @ 2014/03/08 01:14

MS Visual C++ 2012 SDK might be already mature enough and lots of libraries are being built with this version these days. Its support for C++11 is also supposedly better so lets try it. This is not a review. Only a simple “how to” about installing and troubleshooting. (more…)

OSH Park PCB prototyping

Filed under: Uncategorized — Tags: , , , , , , , , — admin @ 2014/03/01 14:48

I’ve sent a little LED dimmer PCB to OSH Park service. For 4.6 USD it is a great deal. Vias are 0.8 mm in diameter and 0.3 mm drill. SMD components are 0805. The result? Very good. (more…)

Single button push on push off

Filed under: Uncategorized — Tags: , , , , — admin @ 2014/02/02 16:11

Turning circuits on and off by a toggle switch is so old school. Today devices have a single push button and that button can power up or down the device with a single push without much force applied. (more…)

Transistor power dissipation

How to choose the right switching transistor for my application? It must withstand the current, generated heat and applied voltages. Current and voltage does not pose any problem. You have to use some calculations about the power dissipation. (more…)

Don’t be afraid of a long learning curve

Filed under: Uncategorized — Tags: , , , , — admin @ 2014/01/31 00:12

This post is a little bit different. It does not contain any how-to, know-how or data. It is a little thought that I came to after a recent experience. (more…)

PCB footprint dimensions

Filed under: Uncategorized — Tags: , , , , , , , , , , , , — admin @ 2014/01/22 14:39

Do you like DIY and default footprints in PCB CAD programs are not satisfying? Create your own. But what are the dimensions and placement positions? Datasheets and some calculations can help a lot. (more…)

Run complex command/process with killing previous

Filed under: Uncategorized — Tags: , , , , — admin @ 2013/11/07 11:05

When I run a Django testing server in a terminal it sometimes gets stuck and it can’t be killed with CTRL+C. Or I’m using SSH client in background mode for a secure proxy tunnel and I need to restart it from time to time. Searching manually for PIDs with ps and grep and killing them is a lengthy process. (more…)

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