Jaroslav
Automatically switching power socket for PC periphery
Published January 30, 2012 | 
Warning!!!
I’m not responsible for any damage you may cause to your equipment, even worse, to yourself using instructions provided bellow. Use these instructions at your own risk.
You probably know the master/slave sockets, this power saving socket strips? Well, they are consuming energy to. Especially the chip ones. If you want to eliminate the standby power consumption of your monitors, printers, active speakers and other devices connected to PC, here is one simple solution. You will need power cord, outdoor socket, 5V relay and USB cable. I use the USB for notebook connected devices, if you have a pc, you could also connect a 5V or 12V relay directly to PSU.
Measuring the performance of DSLR cameras and why the ISO setting could impact the burst length.
Published January 25, 2012 | Today arrived the memory card i ordered for my smartphone (16GB Samsung essential micro SD ), so i got curious how it would do in my EOS600D. The speed tests with a card reader are not very representative for the real application, the card could perform good in the card reader but bad in the camera and vice versa. unfortunately, my camera doesn’t have a build in speed test, so I found another way to measure the real performance. The solution is to record the shutter sound!
I used the mic of the Logitech webcam (my usb microscope :) and Audacity (Free, Cross-Platform Sound Editor) for recording and analysis.
The results of different memory cards are not surprising, but i also tried different camera settings and was astonished about the significant burst rate drop on higher ISOs. The following tests are done in manual mode with manual focus and all the same settings with exception of ISO.
Modding 24V Relay for 12V operation
Published January 25, 2012 | I salvaged some 24V relais from old commutation panels and wanted to use them for a project. But the highest voltage from my psu (pc) was 12 volt. Switching the relays with 12 volt works but not very stable. So I tried to boost the magnetics with a neodymium magnet, with success! After adding the magnets the relays worked perfectly with 12 volt.
DIY digital microscope
Published December 27, 2011 | 
Merry Christmas and Happy new year(); :D
Published December 23, 2011 | Carrera LED Upgrade
Published September 12, 2011 | 