12V Resistor and 12V Regulated WS2811 Pixels

Mark_M

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That is a spoiler. I had hoped that something more exotic was used. Low quiescent and low dropout. About a 3mA quiescent on top of the already inefficient design :jawdrop:
I won't bother with the test. Just let it release the magic smoke then :). LOL.
 

Mark_M

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Mark, are you sure about the regulator number? That's what you saw printed on it?
Whoops.
Part name on it was incorrect. Google 'auto correcting to similar'.
Original post edited.
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AAH

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Mark, are you sure about the regulator number? That's what you saw printed on it?
I presumed that it was a 78L05 which has the 3mA quiescent compared to the 7805 which is 5mA. With Chinese components the marking could be anything of course.
 

Mark_M

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After much delay trying to find a thermocouple to test heat extremities I decided not to perform the test :(.
This video is just the lowest voltage dropout.

I'd be interested to see what the quiescent/standby current of the pixel is with both no data going through
Damn it! I didn't measure without data....



If you cannot be bothered to watch this video.... Spoiler!
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If you have a spare 12 minutes, here is the test video.
Manually edited captions are available (with bad spelling :)).
(Edit: A few spelling mistakes in the video too! It's a majour disappointment. Can they add spell check to a video editor please?)
View: https://youtu.be/n0ZBYLhwcIA


In the video: 'Inside the voltage regulator there is a 78L05 voltage regulator', 'power supply outputting a constant 12v' and 'Sir Circuit'
LMAO!!


No temperature measurements or magic smoke sadly. Once I get some thermal cutout measurement I'll blow it up :).

Spoiler: Specified highest voltage:
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^ According to Texas Instruments data sheet.
https://www.ti.com/lit/ds/symlink/lm78l.pdf (Not an accurate data sheet for this component.)
Bit more accurate to this regulator: https://pdf1.alldatasheet.com/datasheet-pdf/view/22687/STMICROELECTRONICS/78L05.html
 
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AAH

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The future IS now. lol
I kept looking at the meter doing the current measurements and thinking "Mark, change scales".
Your video production is much better then mine. As a result of that I now have Davinci Resolve on my "to do" list to try to see if it makes my video production any better.
It's a shame that the camera was white balancing automatically and not showing the change in colours.
Overall an excellent set of tests Mark and I'm actually a little surprised at how well the 78L05 performed.
 

Mark_M

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The future IS now.
I was trying to find the commentator voice from the computer game Portal 2. "At Aperture laboratories the future is now.".
I managed to find something similar but not the full audio clips of the game. The website seems to have been taken down..... :(

I kept looking at the meter doing the current measurements and thinking "Mark, change scales".
What other scales lol?
The Fluke 23 (1980's model) only has DC current and it auto selects decimal point. I had the probe in 300mA range.

Your video production is much better then mine. As a result of that I now have Davinci Resolve on my "to do" list to try to see if it makes my video production any better.
There is a paid version and free version. It is a bit tricky to learn... I like tracking elements in it. E.g. blur faces moving. I haven't learn't 'node' level yet!
View: https://youtu.be/GmHAiUcAPwk?t=73
 
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