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16 Dec 2019 22:55:16 UTC
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EEVblog #869 - Counting LED Photons!
How may photons does a LED emit at very low currents?
What is the lowest current where a LED will actually emit photons? Dave does some measurements to answer this quantum physics level stuff!
Forum: http://www.eevblog.com/forum/blog/eevblog-869-counting-led-photons!/
EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2
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https://www.youtube.com/watch?v=TJcMgoJ4DOE
What is the lowest current where a LED will actually emit photons? Dave does some measurements to answer this quantum physics level stuff!
Forum: http://www.eevblog.com/forum/blog/eevblog-869-counting-led-photons!/
EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2
Support the EEVblog through Patreon!
http://www.patreon.com/eevblog
...
https://www.youtube.com/watch?v=TJcMgoJ4DOE
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eevblog-642-ti-connected-launchpad
Dave checks out the $20 TI EK-TM4C1294XL Tiva C Series TM4C1294 Connected Launchpad Internet of Things.
ARM Cortex M4 processor with Ethernet and IoT demo application.
http://www.ti.com/ww/en/launchpad/launchpads-connected-ek-tm4c1294xl.html
How useful is it out of the box?
http://www.eevblog.com/forum/blog/eevblog-642-ti-connected-launchpad/
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eevblog-863-sony-d50-discman-teardown
What's inside the world's first portable CD player, the Sony D-50 (D-5) Discman?
1984 vintage!
Also a look at the laser beam splitter optics, and the gorgeous service manual.
Service Manual: http://freeservicemanuals.info/servicemanuals/download/Sony/d-5.pdf
HIres photo: https://www.eevblog.com/2016/03/29/eevblog-863-worlds-first-portable-cd-player-teardown-sony-d50-discman/
Nobutoshi Kihara https://en.wikipedia.org/wiki/Nobutoshi_Kihara
MC Frontalot Zero Day Album: http://frontalot.com/index.php/?page=cd4
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eevblog-1022-how-to-find-a-50
Another look at finding a $50 analog oscilloscope on ebay.
Original video from 4 years ago:
https://www.youtube.com/watch?v=lZfbo-2sd1A
Forum: https://www.eevblog.com/forum/blog/eevblog-1022-finding-a-$50-oscilloscope-on-ebay/
EEVblog Main Web Site: http://www.eevblog.com
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eevblog-1488-tilt-five-augmented-reality
Dave tries Jeri Ellsworth's Tilt Five augmented reality AR glasses for the first time!
Unboxing, first reaction, and a bit of a first user review.
00:00 - Tilt Five AR Kickstarter Glasses
01:42 - Unboxing
06:34 - The retroreflective game board
08:58 - Plugging into USB3 and fan cooling
09:35 - The glasses design robustness
10:42 - First test FAIL!
12:44 - Jeri to the rescue! (USB3 data rate matters)
13:52 - First reaction!
18:16 - As good as I expected!
18:57 - 1080p resolution
21:27 - Power consumption measurement
23:49 - Two thumbs up! + Fan noise
24:37 - Physics demo + ambient light measurements
28:24 - Over 1000lux ambient
29:09 - Looking through the lens
29:39 - Some real gaming action
31:12 - Fantastic quality mode
33:55 - Is it tiring on the eyes?
34:31 - Conclusion
The Amp Hour with Jeri Ellsworth: https://theamphour.com/394-jeri-ellsworth-and-the-demise-of-castar/
Forum: https://www.eevblog.com/forum/blog/eevblog-1488-tilt-five-augmented-reality-ar-glasses-first-reaction/
Support the EEVblog on:
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eevblog-1291-mailbag
More Mailbag!
SPOILERS:
WTF: A soldering iron mouse controller?
10:05 Snapton Designers Guide: https://www.snaptron.com/free-samples/designers-guide/
Snapton Dome Kit: https://www.snaptron.com/free-samples/
20:18 Open Source LED Snowflake: https://luckyresistor.me/
https://shop.pimoroni.com/products/snowflake
27:20 The world's worst user interface oscilloscope? And it's a Tektronix?
The Tektronix T201/T202 oscilloscope.
Createc SC01 Signal Computer
39:00 I2C USB Driver: https://i2cdriver.com/
49:19 Siemens Rat Pee?
Forum: https://www.eevblog.com/forum/blog/eevblog-1291-mailbag/
EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2
Support the EEVblog through Patreon!
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EEVBL
eevblog-1579-nuclear-diamond-battery
The Nuclear Diamond Battery that made a huge marketing splash back in Aug 2020 and raised $1.2M in funding, NDB Inc is now being sued by the SEC for fraud. No product ever existed, no testing was ever done, and they had no customers. Oopsie!
Original Debunking video: https://www.youtube.com/watch?v=uzV_uzSTCTM
https://www.ans.org/news/article-5359/sec-files-lawsuit-against-nuclear-battery-startup/
https://www.sec.gov/files/litigation/complaints/2023/comp25829.pdf
https://www.sec.gov/Archives/edgar/data/1787068/000178706821000004/golsharifi.htm
https://www.sec.gov/Archives/edgar/data/1787068/000178706821000004/offering.htm
https://www.bidwells.co.uk/properties/origin---harlow-essex-cm17-
Forum: https://www.eevblog.com/forum/blog/eevblog-1579-nuclear-diamond-battery-fraud-lawsuit-by-sec!/
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#ElectronicsCreators #Debunking #Fraud
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VIDEO
EEVBL
eevblog-757-hp4263a-lcr-meter-teardown
Another ebay score.
Dave tears down a HP4263A LCR Meter.
How an LCR Meter works: https://www.youtube.com/watch?v=fs2MfTW4o_Q
Forum: http://www.eevblog.com/forum/blog/eevblog-757-hp4263a-lcr-meter-teardown/
4263A Datasheet:
http://www.testequipmenthq.com/datasheets/Agilent-4263A-Datasheet.pdf
4263A User Manual:
http://literature.cdn.keysight.com/litweb/pdf/04263-90001.pdf?id=722686
4263B service manual: http://www.doe.carleton.ca/~nagui/labequip/lcr/4263B_Service%20Manual.pdf
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eevblog-1288-synology-nas-dumpster-find
Is a brand new Synology DS415+ NAS in the dumpster too good to be true?
A tale of teardowns, repair, Intel Atom processor silicon degradation, and dodgy clocks.
Subscribe on Library: https://lbry.tv/$/invite/@eevblog:7
https://www.anandtech.com/show/11110/semi-critical-intel-atom-c2000-flaw-discovered
Forum: https://www.eevblog.com/forum/blog/eevblog-1288-synology-nas-dumpster-find!/
#DumpsterDiving #Intel #Synology
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eevblog-1441-electric-buses-are-not-a
Repsonding to Adam Something's video claiming that electric buses are a scam. Lets analyse his claims and look at what's really happening with the cost benefit anlysis of electric buses vs diesel and electric trolley buses.
Adam's video: https://www.youtube.com/watch?v=AqHsXv7Umvw
00:00 - Electric buses are a scam
01:20 - The claims
01:50 - Growth of electric buses in China
02:40 - Why not just put up wires in cities?
03:45 - Visual polution
05:50 - But they catch on FIRE!
06:38 - Batteries use slave labour!
07:20 - Cost of Electric buses vs Diesel
14:00 - Autonymous trolly buses
18:28 - Everything BUT fully electric buses are viable! Anlysis of trolley buses.
21:29 - Dave's practical table of Pros and Cons comparing the 4 options
27:28 - Electric buses are DUMB! Yeah, nah.
References:
Fosil fuel pollution: https://archive.ph/HvUaH#selection-3475.43-3475.138
Health impacts in Australia: https://soe.environment.gov.au/theme/ambient-air-quality/topic/2016/health-impacts-air-pollution
Emission and health: https://reneweconomy.com.au/victoria-needs-to-get-on-electric-bus-if-its-serious-about-emissions-and-health-44153/
Benefits outweigh costs: https://www.eesi.org/papers/view/fact-sheet-electric-buses-benefits-outweigh-costs
Cost effective: https://www.publicpower.org/periodical/article/electric-buses-mass-transit-seen-cost-effective
Summary of diesel vs electric buses: https://www.researchgate.net/figure/Summary-of-the-cost-comparison-between-Diesel-and-Electric-busses_tbl2_293195329
NREL Financial anlysis of electric buses: https://afdc.energy.gov/files/u/publication/financial_analysis_be_transit_buses.pdf
China: https://www.ies-synergy.com/en/electric-buses-where-are-we/
Maintenance of electric buses: http://www.maintenanceforum.net/cp2018/papers/S_Misanovic-mf18.pdf
Trolleybuses catch on fire too: https://www.1lurer.am/en/2017/12/21/Trolleybus-on-fire-in-Yerevan/78999
Forum: https://www.eevblog.com/forum/blog/eevblog-1441-electric-buses-are-not-a-scam-(adam-something)/
Subscribe on Odysee: https://odysee.com/@eevblog:7
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#ElectronicsCreators #ElectricBus #AdamSomething
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