Author Topic: EEVblog #1043 - Mailbag  (Read 1429 times)

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Offline EEVblog

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EEVblog #1043 - Mailbag
« on: November 30, 2017, 02:33:32 PM »
More Mailbag!
MLCC Paper: http://www.eevblog.com/files/Flexisafe MLCC Termination Device Performance AECRW.pdf



SPOILERS:
AVX Capacitor Bonanza!
Pixel LED Light Kickstarter: https://www.kickstarter.com/projects/zifnu/pixel-full-color-led-flashlight-kit-arduino-compat
Carbide Steel Multimeter Test Probes
AMX Touch Screen controller teardown
Patent bullshit and automotive meter teardown
Pandora Portable Gaming Console Teardown

 
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Offline boffin

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Re: EEVblog #1043 - Mailbag
« Reply #1 on: November 30, 2017, 02:40:17 PM »
The two patents on the one time password fob are long since expired, and isn't there some obscure US law that says it's misleading to print the patent numbers on your product when they're expired?
 

Offline Mr. Scram

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Re: EEVblog #1043 - Mailbag
« Reply #2 on: November 30, 2017, 03:21:38 PM »
The link to the MLCC paper doesn't seem to be working right now.
 

Online Brumby

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Re: EEVblog #1043 - Mailbag
« Reply #3 on: November 30, 2017, 04:55:52 PM »
The link to the MLCC paper doesn't seem to be working right now.

Try this: http://www.eevblog.com/files/Flexisafe%20MLCC%20Termination%20Device%20Performance%20AECRW.pdf


SMF doesn't automatically parse URLs correctly.  You need to put them inside the URL tag or use the %20 escape sequence for a blank.
« Last Edit: November 30, 2017, 04:59:17 PM by Brumby »
 

Offline Barny

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Re: EEVblog #1043 - Mailbag
« Reply #4 on: November 30, 2017, 05:12:36 PM »
The Linux device Pandora had a rough start and was sold till a year or two ago.
There are still replacement-parts available to bring the little sick puppy back to life.
Does it boot after charging?

At the moment, the sucessor Pyra is in development and its in the hard "20% left phase" of projects.
https://pyra-handheld.com/boards/

Here are some development videos of the Pandora and Pyra:
http://www.youtube.com/user/EvilDragon1717/videos

Its a interesting little device with an nice open development.
The successor of the Pandora uses a dual board construction to reduce costs because the main processor and ram needs a high layer count board. That way the large main board has only few layer and the high layer count processor board (I think it was something arround 10 layers) stays small.
« Last Edit: November 30, 2017, 05:21:25 PM by Barny »
 

Online blueskull

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Re: EEVblog #1043 - Mailbag
« Reply #5 on: November 30, 2017, 05:13:26 PM »
Aren't the PCB inductor and spark gaps for ESD mitigation?
SIGSEGV is inevitable if you try to talk more than you know. If I say gibberish, keep in mind that my license plate is SIGSEGV.
 

Online chriswebb

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Re: EEVblog #1043 - Mailbag
« Reply #6 on: November 30, 2017, 07:16:35 PM »
As far as the worthless patent is concerned, I can give one possible explanation based on experience:

Dumb money. Bad investors who only know how to check off their lists of the latest buzzwords they read in how to invest for dummies.
Always learning. The greatest part of life is that there will always be more to learn.
 

Offline capt bullshot

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Re: EEVblog #1043 - Mailbag
« Reply #7 on: November 30, 2017, 08:18:38 PM »
Another owner of a Pandora here  :)

I was really surprised by popping one up here in the mailbag, then quite excited of what Dave would say about it. To me, it was a "don't even think about not getting one" decision to get one once I got notice of its existence. Mine is a standard black one, also a Rebirth Edition made by EvilDragon in Bavaria. I'm still using it as a MP3 player and handy linux device (it's got all the good command line stuff that you'd expect from a linux box). I never was into gaming, tried a few ones, even Doom runs on it.

Eagerly waiting for my Pyra ...
Safety devices hinder evolution
 

Offline Barny

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Re: EEVblog #1043 - Mailbag
« Reply #8 on: November 30, 2017, 09:18:13 PM »
The Pyra will be delivered "in two month (Tm)"   >:D
(A little joke because of massive delays of the Pandora production.)
 

Offline ggchab

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Re: EEVblog #1043 - Mailbag
« Reply #9 on: November 30, 2017, 09:37:22 PM »
The "non slip probes" seem to be using standard carbide end mills for Dremel, Proxxon or similar tools. Clever idea  :-+
 

Online grimmjaw

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Re: EEVblog #1043 - Mailbag
« Reply #10 on: November 30, 2017, 11:26:37 PM »
Does anyone know the part number for the Pixel's power button?
Been looking for that type of switch for ages
 

Offline LapTop006

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Re: EEVblog #1043 - Mailbag
« Reply #11 on: November 30, 2017, 11:39:57 PM »
The most recent similar thing to the Pandora I'm aware of are the little machines by GamePad Digital.

The 5.5" unit is the most similar:
http://www.gpd.hk/gpdwin.asp

But the newer 7" version is really nice, I picked one up to have a nice pocket PC (A successful IGG for a change).
http://www.gpd.hk/pocket.asp

And of course the classic would be the IBM PC 110, I have one, but sadly non working.
« Last Edit: November 30, 2017, 11:48:14 PM by LapTop006 »
 

Offline jonovid

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Re: EEVblog #1043 - Mailbag
« Reply #12 on: December 01, 2017, 02:12:48 AM »
The "non slip probes" seem to be using standard carbide end mills for Dremel, Proxxon or similar tools. Clever idea  :-+
look like dentist tools repurposed.
The most recent similar thing to the Pandora I'm aware of are the little machines by GamePad Digital.

The 5.5" unit is the most similar:
http://www.gpd.hk/gpdwin.asp

But the newer 7" version is really nice, I picked one up to have a nice pocket PC (A successful IGG for a change).
http://www.gpd.hk/pocket.asp

And of course the classic would be the IBM PC 110, I have one, but sadly non working.

must get one  8)

as for the cap set
how about some supercap projects on the eevblog  ;D

Patent a hands free meter for  :-/O automated testing for robotics applications.
Hobby of evil genius      basic knowledge of electronics
 

Offline GreggD

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Re: EEVblog #1043 - Mailbag
« Reply #13 on: December 01, 2017, 02:30:23 AM »
The screws on the fob look to be for programming. The resistors could be so that only unusual voltages (not 0 & 3.3v) are used for communication.
 
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Online rsjsouza

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Re: EEVblog #1043 - Mailbag
« Reply #14 on: December 01, 2017, 05:00:12 AM »
I don't get Dave's rage against the patented method of DMM strap: they are excellent for jogging! (and you never know when you are going to need a DMM)  :-DD
Vbe - vídeo blog eletrônico http://videos.vbeletronico.com

Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline gardner

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Re: EEVblog #1043 - Mailbag
« Reply #15 on: December 01, 2017, 05:56:42 AM »
The screws on the fob look to be for programming.

This was my thinking.  There is a small inductor, spark gap and current limiting resistor as input protection, but basically these will be programming/management connections.  It probably permits the master encryption key to be written to the device at the time of issuing to a customer by attaching the OTP dongle into a programming station.  Probably functions like setting the user PIN or correcting the clock time or clock skew also use these connections.
--- Gardner
 

Online Richard Crowley

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Re: EEVblog #1043 - Mailbag
« Reply #16 on: December 01, 2017, 06:12:36 AM »
The "non slip probes" seem to be using standard carbide end mills for Dremel, Proxxon or similar tools. Clever idea  :-+
look like dentist tools repurposed.
That was my suspicion at the beginning, and then confirmed when Dave showed the microscope view.
Now, if they just put a little motor in the end of the probe you could really have some fun.   ;D
 

Offline Fungus

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Re: EEVblog #1043 - Mailbag
« Reply #17 on: December 01, 2017, 06:53:09 AM »
Anybody who was made to study Latin knows that equus is "horse".

It's an iHorse multimeter  :)

 

Offline Neilm

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Re: EEVblog #1043 - Mailbag
« Reply #18 on: December 01, 2017, 07:06:26 AM »
As far as the worthless patent is concerned, I can give one possible explanation based on experience:

Dumb money. Bad investors who only know how to check off their lists of the latest buzzwords they read in how to invest for dummies.

Here is a second explaination - company "procedure". I have worked for a company where it was pretty much manadory for every project to have at least 1 patentable idea. The result - wasted time and money trying to patent really stupid things just so we didn't get told we "weren't inventing enough"
Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe. - Albert Einstein
 

Offline rachaelp

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Re: EEVblog #1043 - Mailbag
« Reply #19 on: December 01, 2017, 09:22:32 AM »
The "non slip probes" seem to be using standard carbide end mills for Dremel, Proxxon or similar tools. Clever idea  :-+

They are very good but they are definitely dental drills not Dremel bits. I'm an Element 14 member and I was fortunate enough to have John send me a set for testing and they are excellent in use. They just will not slip off a joint an you need to apply almost no pressure and you can get the probes down to some really quite shallow angles from the board and the still grip in there nicely. They are truly excellent to use.

I just wish Dave hadn't felt the need to have a pop at Element14. They're not in competition with here, they're offering a very different experience and it's a really friendly and supportive community. It really wasn't necessary to say anything about them at all. Other than that, another great video Dave!

Best Regards,

Rachael
I have a weakness for Test Equipment so can often be found having a TEA break (http://www.eevblog.com/forum/chat/test-equipment-anonymous-(tea)-group-therapy-thread/)
 

Online garboui

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Re: EEVblog #1043 - Mailbag
« Reply #20 on: December 01, 2017, 12:00:57 PM »
I fell off my chair at 1:13  :-DD
 

Online snoopy

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Re: EEVblog #1043 - Mailbag
« Reply #21 on: December 01, 2017, 04:43:18 PM »
I fell off my chair at 1:13  :-DD

I thought the expose of the silly multimedia patent at 12:30 was the funniest thing I have ever seen on a mailbag. If Dave ever gives up electronics he might look at becoming a comedian. Just priceless :-DD
 

Offline kosine

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Re: EEVblog #1043 - Mailbag
« Reply #22 on: December 01, 2017, 11:44:46 PM »
Yes, the carbide probe tips are dental burs (not burrs). The ones used are Jet brand, specifically hand piece style (HP). They have a 1.6mm shank, although burs also come in 2.35mm types: FG (friction grip) and RA (right angle, also known as contra-angle). There are many other suppliers out there, and any HP style would work for this application. You can also get longer ones ("surgical" is the longest), and a pack of 5 is typically in the $10 range.

However, they are quite brittle. I wouldn't bash or drop them against any hard surface, otherwise they'll snap real easy. (I use the Jets for CNC work, and they're pretty good. The naming convention and ISO numbering take a bit of working out though!)

Interesting factoid: these are "slow speed" burs intended to run at 50,000rpm. High speed burs go up to 500,000rpm.


On the patent issue, it's actually very well written. The comedic terminology is just patentese (a dialect of legalese). Plain English is too easy to "misconstrue", so patents use their own language with specific meaning in court.

A "person skilled in the art" is someone deemed competent in the field (and familiar with the "state of the art"), but also assumed to be "unimaginative". The standard test for obviousness is whether a PSITA would have had the same invention if presented with the same problem.

The variation on the "preferred embodiment" bit is also standard in most patents.

Don't know if this patent is from China, but the Chinese government have set targets for patents over the last few years, so companies are keen to file for anything they can to meet their quota. If you'd seen the patent for fidget spinners before the craze kicked off you'd probably have thought that a daft idea as well... (There was one - but the American lady who filed it couldn't afford to maintain it, so it expired and she got nothing.) If you're not the one paying for it, it's best to file for everything you can, because you never know how things will pan out.
 

Offline imidis

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Re: EEVblog #1043 - Mailbag
« Reply #23 on: December 02, 2017, 01:43:19 AM »
Thanks for another mailbag!  :)
 

Offline prof

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Re: EEVblog #1043 - Mailbag
« Reply #24 on: December 04, 2017, 11:04:51 AM »
I used to hang with the guy known as EvilDragon quite a lot 2 decades ago. He's always been extremely passionate about video games and it was always his big dream of developing his own console. It's really great to see that people are striving to and capable of fulfilling their childhood dreams, I really admire that.  :-+  :clap:
 


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