Author Topic: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!  (Read 39222 times)

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Offline coppice

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #25 on: July 17, 2015, 01:31:43 pm »
Does anyone make a genuine cordless personal static dissipater? Some type of body worn ioniser, perhaps?
Is the atmosphere grounded? (Genuine question)
Bench mounted ionising static dissipaters work on the basis that opposites attract, and a charged surface will attract only the what is needed to discharge it. They don't depend on a ground.
« Last Edit: July 17, 2015, 01:33:26 pm by coppice »
 

Offline f4eru

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #26 on: July 17, 2015, 01:34:56 pm »
lol, Dave, you need a sign :  "Please wear a pair of ESD rated bare feet"



Quote
I have socks on carpet in my room when I work on electronics.  Could you test the foot rub test with socks as well to see what voltages you get?
Depends on  the material of the carpet ( ESD dissipative carpet ??), the material of the socks, and your sweat. Do you have ESD socks and carpet ? if not, it's not a good idea !!
 

Offline PGrant

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #27 on: July 17, 2015, 01:36:22 pm »
Never stood on an IC, can't imagine it being worse than standing on lego though.
 

Offline rs20

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #28 on: July 17, 2015, 01:45:25 pm »
Never stood on an IC, can't imagine it being worse than standing on lego though.
14 little razor blades > 6 blunt plastic bumps.
 

Offline John Coloccia

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #29 on: July 17, 2015, 01:46:52 pm »
Maybe cordless means "supply your own cord"? Lost in translation?

Else, why even bother with the 1meg resistor? Save production costs and leave it out...

That what I was thinking too.  Something is lost in the translation. Why add that screw to the resistor?  It looks better without it, so it clearly has some purpose other than looks.
 

Offline LordNobady

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #30 on: July 17, 2015, 01:48:31 pm »
Never stood on an IC, can't imagine it being worse than standing on lego though.
14 little razor blades > 6 blunt plastic bumps.

the lesson is not to keep your spare parts on the floor but use and (ESD) storage bin. ;)
 

Offline AF6LJ

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #31 on: July 17, 2015, 01:52:54 pm »
What I find amazing about this product, is the idea that anybody could fall for such a obvious scam.
Sue AF6LJ
Test Equipment Addict, And Proud Of It.
 

Offline amyk

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #32 on: July 17, 2015, 02:37:34 pm »
Maybe cordless means "supply your own cord"? Lost in translation?

Else, why even bother with the 1meg resistor? Save production costs and leave it out...

That what I was thinking too.  Something is lost in the translation. Why add that screw to the resistor?  It looks better without it, so it clearly has some purpose other than looks.
Agreed - maybe there's supposed to be a cord and connector attached to the screw, but they ran out of them or this is an "unfinished" item intended to be assembled to a cord.
 

Offline oxcart

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #33 on: July 17, 2015, 02:48:09 pm »
Huh, so it doesn't work? Now there's a shocker!

Thanks for the video Dave! Next up: Directional cables!
I back the Audiophooles Directional Cables review request!!
Only problem: how to find them without spending a fortune. Dave, ask a local audiophool group to lend you a couple!

You'd be busting several big bucks companies...
 

Offline zapta

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #34 on: July 17, 2015, 02:50:17 pm »
Here is the prototype of my invisible wristband. Will start taking orders soon.


Drain the swamp.
 

Offline mmagin

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #35 on: July 17, 2015, 03:03:34 pm »
Maybe cordless means "supply your own cord"? Lost in translation?

Else, why even bother with the 1meg resistor? Save production costs and leave it out...

Even if that is the intent, I suspect it's an insufficiently safe design to use a tiny 1/8 W resistor which almost certainly doesn't have a sufficient voltage rating for the range of mains voltages that may be encountered in use.
 

Offline Artlav

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #36 on: July 17, 2015, 03:10:30 pm »
Busted, eh?

But the question remains - how do they dissipate static charge on spaceships?
You can't exactly run a grounding cord to the nearest planet. :-//
Hacking the universe since 2008
Having a life since 2013
 

Online Ian.M

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #37 on: July 17, 2015, 03:30:59 pm »
Get close to docking then release a cloud of pith balls?


Remember, there is no such thing as absolute potential, so in the absence of a dominant reference point like a planet, all you need to do is equalise charge with the other craft in a non-destructive manner.
« Last Edit: July 17, 2015, 03:34:10 pm by Ian.M »
 

Online Ian.M

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #38 on: July 17, 2015, 03:39:09 pm »
Here is the prototype of my invisible wristband. Will start taking orders soon.

Do you have them in other colours?
That one's too small for me. Are you planning to make larger sizes?

Is it comfortable to wear?

Is it washable?
 

Offline vlad777

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #39 on: July 17, 2015, 04:03:09 pm »
I can see one possible use case for this thing:  :popcorn:

When walking around the office (pvc floor) in the winter (very dry air) one can built up a quite a lot of charge.
So much in fact that it is rather painful to touch any earthed object. (big metal objects are also an option even when not earthed)
In that case one could touch the screw on that strap to the nearest earthed object for a non-painful discharge.

I think you are right, and this is the purpose of this thing.
At least it was until the marketing people got it in their hands.  |O
Mind over matter. Pain over mind. Boss over pain.
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Offline vlad777

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #40 on: July 17, 2015, 04:19:09 pm »
Here is the prototype of my invisible wristband. Will start taking orders soon.




I had a strange thought. What kind of queries would bring up this pic on Google images?
Mind over matter. Pain over mind. Boss over pain.
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Offline sergey

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #41 on: July 17, 2015, 04:23:05 pm »
That what I was thinking too.  Something is lost in the translation. Why add that screw to the resistor?  It looks better without it, so it clearly has some purpose other than looks.
Agreed - maybe there's supposed to be a cord and connector attached to the screw, but they ran out of them or this is an "unfinished" item intended to be assembled to a cord.

On the one hand sounds logical, but still -- the connector doesn't seem reliable at all. Also ratings of the resistor are questionable. Guess 1/8W is fine (it does not dissipate too much power anyway) but think it wouldn't meet voltage requirements?
 

Offline TheAmmoniacal

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #42 on: July 17, 2015, 04:41:06 pm »

I had a strange thought. What kind of queries would bring up this pic on Google images?

Try: "arm and hand"
I collect [corporate] mugs.
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Online Fungus

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #43 on: July 17, 2015, 04:49:57 pm »
What I find amazing about this product, is the idea that anybody could fall for such a obvious scam.
Is it obvious?

I'm not sure if such a thing is possible or not. I can imagine a battery powered device that generates opposite charge to the one at your wrist in order to cancel it out. I don't know how you'd go about making it, but I can imagine it.

(Wrist-mounted Van-Der-Graaf generator?)

 

Offline free_electron

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #44 on: July 17, 2015, 04:51:28 pm »
i think you are reading too much in this products advertisement.

it is exactly what it states : a cordless antitstatic wristband. 

it comes without a cord. you need to provide your own ... just list the little screw, slip your cord under it and tighten the screw. the 1 meg resistor is in the case.
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Any comments, or points of view expressed, are my own and not endorsed , induced or compensated by my employer(s).
 

Offline AlfBaz

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #45 on: July 17, 2015, 04:59:21 pm »
What I find amazing about this product, is the idea that anybody could fall for such a obvious scam.
Is it obvious?

I'm not sure if such a thing is possible or not. I can imagine a battery powered device that generates opposite charge to the one at your wrist in order to cancel it out. I don't know how you'd go about making it, but I can imagine it.

(Wrist-mounted Van-Der-Graaf generator?)

Easy to test. Silk cloth, glass rod and a battery.
Rub glass rod with cloth and it should attract small pieces of paper, touch rod to negative terminal on battery glass rod should now be chargeless. My bet is it will still be charged
 

Offline vlad777

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #46 on: July 17, 2015, 05:02:30 pm »

Try: "arm and hand"

Correct! (It is there.) I like this one:
« Last Edit: July 17, 2015, 05:05:13 pm by vlad777 »
Mind over matter. Pain over mind. Boss over pain.
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Offline Dave Turner

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #47 on: July 17, 2015, 05:31:54 pm »
How about the Emperor's new sleeve?
 

Offline PGrant

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Re: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #48 on: July 17, 2015, 06:11:45 pm »
Never stood on an IC, can't imagine it being worse than standing on lego though.
14 little razor blades > 6 blunt plastic bumps.

Don't underestimate the pain of standing on lego.



Or a sarcastic post. . .
 

Offline Alvin

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Fix: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED!
« Reply #49 on: July 17, 2015, 06:19:01 pm »

Hi Dave,

If you fill up the cavity with uranium, plutonium, cobalt or some other nice stuff, it will start to work through ionisation. This should allow you to salvage the $1.

Cheers,
Alvin.
 


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