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.

#YesScotland

 
September 18, 2014

Finally some nice spots on the Sun to observe


Largest spot is greater than Earth...
 
September 13, 2014

UNIS tbm de Luxe typewriter

During my childhood in the village I was learning to type on a typewriter. It was some electrical typewriter, "Yatran" if I recall it correctly.
Recently I accidentally got mechanical Yugoslavian UNIS "tbm de Luxe" typewriter in a leather case - it seems they were very popular in USSR back in 1960-80's.

It is quite hard to type on it as it requires to hit keys with much higher force.
So blind 10-finger typing is impossible without lots of extra physical exercises :-)

Also scored 3 last typewriter ribbons from local e-shop. These were made in Belarus in 2013. It's surprising that typewriter ribbon is still in production (BTW manufacturer guarantee that it is good for only 2 years since manufacturing). Probably typewriters are still in use in some government agencies (due to secrecy?)

On this photo it is still with old ink tape:
 
August 25, 2014

Sun photography

Today I bought Baader AstroSolar filter for sun observation - it reduces brightness by a factor of 100'000 (OD5).
The following photo was made by Sony 500mm/F8 lens and A77ii - my first semi-transparent mirror camera: finally I can observe the sun without fear of retina burn if something happens with the filter.

Exposure which allows to see the spots is 1/800 at ISO100/F8, without filter it would require exposure of 1/80'000'000 seconds - which is unrealistic. Full 14-bit resolution is needed to see the spots without excessive noise. In the future it might be beneficial to normalize sun brightness variation across the area - this should help with the spots close to the edges.

Sun is currently near minimum of it's activity - on this photo we can only observe 3 tiny spots. During maximum activity total number of spots could reach 250 - this should be more spectacular.

I remember first time when I tried to observe sun ~7 years ago with 50mm/30x spyglass and floppy disk "filter". I made a fatal mistake then: i placed "filter" on the eyepiece side, and obviously sun immediately burned through it as soon as I found the sun. Luckily, it didn't get retina burn that time.


 
July 19, 2014

Flying Flight Design CTLS

This weekend I was flying on Flight Design CTLS. This is fully composite 2-seat small airplane, empty weight is just 326kg. This airplane costs about 200k euro, 1 hour of rental in the air club is ~200$. According to our approximate calculations it eats about 7 liters of gasoline (AI-95) per 100km of flight, some actually use it to travel across Russia.

On the video takeoff is at 3:45 , I am in control at 8:45 and landing at 11:45.

Among others flying same day my impression was the most neutral, apparently I am not going to be adrenaline addict. That was extremely interesting, but that's it. My interest was completely fulfilled.

I finally figured out that ailerons are much more useful than rudder. With ailerons you utilize maximum aerodynamic quality of the wings when changing direction of flight, while with rudder only fuselage is working, so you have aerodynamic quality of only 2-3 - this means you are loosing much more energy for the same rotation. It always felt unnatural that RC airplanes tend to use rudders for rotation, not ailerons.
May 27, 2014

Shooting Glock 34


 
April 25, 2014

Fake audiophile opamps: OPA627 (AD744?!)

Walking around ebay I noticed insanely cheap OPA627's. It's rather old, popular and high-quality opamps, often used in audiophile gear. Manufacturer (Texas Instruments / Burr Brown) sells them 16-80$ each (depending on package & options) while on ebay it's cost was 2.7$, shipping included.

Obviously, something fishy was going on. I ordered one, and for comparison - older one in metal can package, apparently desoldered from some equipment. Let's see if there is any difference.

Read more on zeptobars.ru →
 
April 9, 2014

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