There are lots of “rainbow LED" projects in the internet. So, I decided to place something similar in my weblog.
There are 4 hardware PWM outputs in ATMEGA16. So do not need to build fancy software routines to make pulse width modulation (PWM) by software. Just define PWM output in the chip and forget. Other chips […]
Blog entry 008 is not working… so here is 009
I installed electronic lock with Dallas (Maxim) i-Button chips. It was very simple, low security version of electronic lock as it uses DS1990A chips as the keys. Original lock was made using PIC mcu (the smallest available) and 24C16 serial eprom to store key numbers. I […]
Some time ago, I tore a piece of cinema film from local cinema theatre. The movie was some dark work, about vampires or something. Recently, in wikipedia I found article about Dolby digital encoding on the film tape.
I found my film strip and checked it for digital data. Under microscope I found dolby digital data […]
HDTV, hdtv… whattheheck is that HDTV? Here is some screenshots to describe the size of unscaled HTDV image. You don't need to know about pixels and lines, do not need to describe difference between 720p and 1080i… Just look to the image and find little windows start menu gadgets on the bottom of the image.
And […]
Oh, it is great treasure. I've made sweep generator, but I didn't build any attenuation device for it. I've tested regular carbon variable resistor, but the output was too noisy. I've also tested high resistance wire wound variable resistor, but the inductance was too high and the attenuation in higher frequency was horrible.
By a chance […]
I've already mentioned that I have small problems compiling Windows executable from source code. It is maybe my compiler’s problems. Maybe it is some strange version build or bad crack . I was using Borlan Delphi Professional, Second Edition v7.2, Created 2006 by Lite Application.
After some experiments I managed to solve the problem is […]
I've tested 23″ Apple Full HD wide cinema monitor. The difference in size compared to standard 17″ LCD monitor is not very big because width and height (aspect) ratio is different. For standard, old, LCD it is 4:3, while Apple monitor is 16:9. Width of monitor is measured in hypotenuse and the jump from 17 […]
I found very cool resistors in old equipment. They are very nice design. The values are almost unusable in our days, especially in hobbyist works, but resistors are very nice. Resistors are inside glass tubes. The resistance is very big- it was some timing selector in old scientific equipment.
The value are in quite strange line: […]
I installed video surveillance system at my work place. Nothing special 6 color CCTV cameras, one computer with few hundreds of gigs storing about a month of h.264 video. But I had a problem with one camera. The distance from camera to computer is not very big, about 300 meters (~900 feet). But the problem […]
At work, sometimes, we need to print some papers in color. So we need some cheap color printing solution. First we used old HP 970cxi printer, but now we need to print more. Original cartridges are very expensive, so we used refilled ones. It is very easy to fill color cartridge, just add some ink […]
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