Few words about me:From very childhood I loved computers, electronics, lasers, sulfuric acid and liquid nitrogen. I always wanted to be making microchips, UAVs and see nuclear explosion.
Now I am doing software engineering and in the spare time - some microelectronics and physics/chemistry experiments.
I live and work in Russia, Moscow.
Flickering LED reverse-engineering (+RGB)1.5 years ago there was an attempt to reverse engineer behavior of flickering LED as a black box. That time the results were that flickering does not repeat itself (so it's not something like LFSR pseudorandom generator), brightness is set by PWM and there is some distribution of brightness. Since then more results wereachieved, and I also got some time to dig in.
Previously it was discovered that there are multiple variants of die of flickering LEDs. You may see photos and read some clues on their inner workings here - candleflicker_led">siliconpr0n.org, cpldcpu.wordpress.com, hackaday.com. It is surprising that seemingly simple task of flickering LED is being solved numerous times by full custom ASIC, and there is even some competition/progress!
DIN modules and busbar solderingBefore: DIN circuit breakers were connected in soviet-electrician-style "it did the best with the stuff I had", consecutive using usual wire. Effectively all current goes through point contacts on first module. These places are the main reliability and safety concern - it could easily overheat and cause a fire. For example on the right see similar setup under 4.25kW power consumption (20А) via thermal imaging camera.
Amateur astronomy starts now!For quite some time I wanted to buy a telescope - but it was nowhere to store it in rented apartment. Here is my previous attempt. Finally this time has come - I ordered Sky-Watcher 10" DOB SynScan from famous German shop http://telescope-express.com. Even with delivery and customs taxes it was cheaper than in local stores. 10" was selected as largest diameter which could still be used at balcony.
Switzerland 2014In the summer of 2014 i've been on business trip to Switzerland. Finally got some time to share few photos.
The most iconic one is probably the cows eating grass in Alps, 2000 meters above the sea level: