Author Topic: EEVblog #1000 - Fundamental Mailbag Retro Teardown Shootouts are Bullshit  (Read 13997 times)

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Offline 3db

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zena as transistor he said, you wont find in a textbook he said :popcorn:

That circuit has absolutely nothing to do with what Dave was describing.  :palm:
3DB
 

Offline joeqsmith

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zena as transistor he said, you wont find in a textbook he said :popcorn:

That circuit has absolutely nothing to do with what Dave was describing.  :palm:
3DB

My guess is Dave was thinking about the 121GW when making that segment. 
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 

Offline oldway

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As aficionado of high end analog oscilloscopes, I would like to thanks Dave for the use of the excellent HP1740A in his 1000 video... :-+
 

Offline jonovid

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zena as transistor he said, you wont find in a textbook he said :popcorn:

That circuit has absolutely nothing to do with what Dave was describing.  :palm:
3DB

My guess is Dave was thinking about the 121GW when making that segment. 

Zener Diodes Tutorial   repurposing semiconductors  :-/O  got to love it
reminds me of a trick of using logic gates for analogue   ;D
Hobby of evil genius      basic knowledge of electronics
 

Offline SeanB

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Using a bipolar transistor as a zener is also a good way to make a nice wideband analogue noise source. Cheap noise source with a reasonable white spectrum, and could be filtered to make pink or other noise types, Just needed some good small signal wide bandwidth amplifiers as well to make RF noise as well.
 
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Offline Brumby

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Using a bipolar transistor as a zener is also a good way to make a nice wideband analogue noise source. Cheap noise source with a reasonable white spectrum, and could be filtered to make pink or other noise types, Just needed some good small signal wide bandwidth amplifiers as well to make RF noise as well.

That would make an interesting circuit to show someone unfamiliar with the idea.  Watch them wonder what the two transistors are doing at the input of a wideband RF amp.
 

Online Circlotron

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Meredith Perry makes even Clock Boy look like an engineer.
 

Offline f4eru

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Yep.
Burning Investor money : OK
Transmitting power through sound: OK
Increasing distance, and adding focusing through phased arrays : OK
Adding a localization possibility (probably by TOF triangulation on elements of the array, of with array scanning and probing - A kind of sonar.): OK
Increasing power to levels where even the air is non linear : No way to give that into the hands of a customer. Not safe.
Arguing it locates the phone to focus the energy to it and not damage your body ? No Way. Functional safety does not work without proved guarantee.
Accepting 99% loss ? No Way. (50 million phone chargers * 500W loss -> 25 GW equivalent to 20 brand new nuclear plants generating waste)
User accepting the limitations in orientation and free line of sight requirements ? No Way.
Trying to compete with that crazy expensive double phased array bricks setup against two flat 30 cent copper coils : No way.


Conclusion : It won't happen. You can't just ignore physics, ergonomics, Safety, and economics and also make a successful product

« Last Edit: June 25, 2017, 10:46:58 pm by f4eru »
 
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