The Godfather talking
You may crack software. How about me?
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 51 
 on: June 28, 2019, 08:42:32 08:42 
Started by Nema99 - Last post by Nema122
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 52 
 on: June 27, 2019, 09:16:15 09:16 
Started by Just4Fun - Last post by zac
Having had problems with fake and substandard parts even from grey market US vendors, I usually avoid them with the exception of a few parts like relays where it is possible to determine if they are fake by visual inspection.  

I recall a particular DC-DC converter module that we had purchased 20K of before finding out they were fire hazards.  We had used several hundred of them in products which turned out to be an expensive problem since we had to quietly retrieve our products before they ignited.  Our customers were pleased they received an upgraded product at no cost since they were not aware of the problem except for the ones that started smoking.  Fortunately, there were only 2 failures in the field which did not cause significant damage.  We were able to replicate the failure and the manufacturer (a US company) took them back, but I was shocked to find them being sold on ebay by a seller based in china a year later.  I could tell it was the same part we had returned by the date and other codes.  I sent the ebay seller a message informing them they were fire risks, but received no reply.  

 53 
 on: June 27, 2019, 03:23:49 03:23 
Started by Just4Fun - Last post by vern
I buy a lot of components and modules at Aliexpress and they are mostly good.
The only thing I had a problem with: A CC1101 module, where the onboard 26MHz quartz is so bad that the intended RF frequency was 897.9 MHz instead of 898. I was wondering why the module wouldn't communicate with a TI Testboard until I found out.
Luckily I have a HackRF radio where I can see the frequencies, after frequency adjustments it worked.
I will replace the quartz on the board with a better one so I dont't have to cheat with the frequency.

 54 
 on: June 26, 2019, 08:00:54 20:00 
Started by crenn - Last post by crenn
CountryAustralia
NoteWork mainly on microcontrollers (both as my job and hobby) so have in depth knowledge of PICs (from, PIC12 to dsPIC33 upto PIC32MZ), AVR (ATMegas down to ATTiny), ARMs (STM32 series mostly) and ESP32.

 55 
 on: June 26, 2019, 03:29:59 15:29 
Started by vanumo - Last post by vanumo
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 56 
 on: June 26, 2019, 03:23:55 15:23 
Started by vanumo - Last post by zac
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 57 
 on: June 26, 2019, 03:20:10 15:20 
Started by cyber_drifter - Last post by zac
The flash looks a lot like a cosmic ray hit. This is not uncommon with image sensors. The pixel (and sometimes its neighbors if the pixel overflows) is filled with electrons for a single frame; then it's read out and the pixel returns to normal. Software often filters these out because they're so distinctive (and distracting). Cosmic rays don't only affect image sensors - they also can cause DRAM bit errors and have other effects in silicon devices.

Cosmic rays are a possibility.  But, the camera is of 2009 vintage and the image sensor resolution is only 640 x 480 fabricated with a coarse CMOS process (> 1000 nm).  

https://www.etradeasia.com/products_detail/454379/454379/0/IP_Camera.html

This paper has some interesting on radiation effects on semiconductors:

https://www.xilinx.com/support/documentation/white_papers/wp402_SEE_Considerations.pdf


(SOS is silicon-on-sapphire, 1 um is equivalent to 1000 nm)
"For the CMOS/SOS cells and the assumption that the epitaxial silicon thickness does not scale, the analysis indicates that the error rate increases by slightly more than an order of magnitude in scaling down from 4 to 0.4 um feature size. The error rate for CMOS/SOS cell is about 3 orders of magnitude less than CMOS/Bulk cell for the baseline case (4 um feature size) and about 2 orders of magnitude less for the smallest scaled case (0.4 um feature size)."

https://ieeexplore.ieee.org/document/4336494

 58 
 on: June 26, 2019, 02:51:18 14:51 
Started by vanumo - Last post by vanumo
CountryGermany
NoteI'm a Electronics Design Engineer ,digital and  analog electronic with regular parts.
I will post my projects like SDR RF Scanner , answer questions and help with my knowledge for pcb designs.
This is my hobby, at real live i have a none technical job :-o . Invite me for surprise. Thanks my friends.

 59 
 on: June 26, 2019, 01:33:00 13:33 
Started by cyber_drifter - Last post by bigtoy
This video is taken during daylight showing a different phenomena back in 2011. Note the "flash" near the middle left side at the 49 second mark.


The flash looks a lot like a cosmic ray hit. This is not uncommon with image sensors. The pixel (and sometimes its neighbors if the pixel overflows) is filled with electrons for a single frame; then it's read out and the pixel returns to normal. Software often filters these out because they're so distinctive (and distracting). Cosmic rays don't only affect image sensors - they also can cause DRAM bit errors and have other effects in silicon devices.

 60 
 on: June 26, 2019, 10:43:11 10:43 
Started by cyber_drifter - Last post by sadman
why not give try to microwave Doppler radar you can adjust it range as you need or required and can be interface with Arduino

https://www.electroschematics.com/13246/get-started-microwave-radar-motion-sensor/


Attach link to Electric Field Proximity Sensor paper which interface with Arduino for human motion detection

MIT develop a electric field proximity sensor with adjustable range detail can be found at www.bik.com but the file mention on the link with all detail can not be found

regards
samdan


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