Author Topic: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED! (Read 50344 times)

coppice · « **Reply #25 on:** July 17, 2015, 01:31:43 pm »

Quote from: rs20 on July 17, 2015, 01:27:47 pm

Quote from: coppice on July 17, 2015, 01:25:43 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.

f4eru · « **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 !!

PGrant · « **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.

rs20 · « **Reply #28 on:** July 17, 2015, 01:45:25 pm »

Quote from: PGrant on July 17, 2015, 01:36:22 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.

John Coloccia · « **Reply #29 on:** July 17, 2015, 01:46:52 pm »

Quote from: dadler on July 17, 2015, 06:29:15 am

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.

LordNobady · « **Reply #30 on:** July 17, 2015, 01:48:31 pm »

Quote from: rs20 on July 17, 2015, 01:45:25 pm

Quote from: PGrant on July 17, 2015, 01:36:22 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.

AF6LJ · « **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.

amyk · « **Reply #32 on:** July 17, 2015, 02:37:34 pm »

Quote from: John Coloccia on July 17, 2015, 01:46:52 pm

Quote from: dadler on July 17, 2015, 06:29:15 am
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.

oxcart · « **Reply #33 on:** July 17, 2015, 02:48:09 pm »

Quote from: daqq on July 17, 2015, 08:25:06 am

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...

zapta · « **Reply #34 on:** July 17, 2015, 02:50:17 pm »

Here is the prototype of my invisible wristband. Will start taking orders soon.

mmagin · « **Reply #35 on:** July 17, 2015, 03:03:34 pm »

Quote from: dadler on July 17, 2015, 06:29:15 am

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.

Artlav · « **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.

Ian.M · « **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.

Ian.M · « **Reply #38 on:** July 17, 2015, 03:39:09 pm »

Quote from: wilfred on July 17, 2015, 03:36:02 pm

Quote from: zapta on July 17, 2015, 02:50:17 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?

vlad777 · « **Reply #39 on:** July 17, 2015, 04:03:09 pm »

Quote from: barnacle2k on July 17, 2015, 06:00:29 am

I can see one possible use case for this thing:

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.

vlad777 · « **Reply #40 on:** July 17, 2015, 04:19:09 pm »

Quote from: zapta on July 17, 2015, 02:50:17 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?

sergey · « **Reply #41 on:** July 17, 2015, 04:23:05 pm »

Quote from: amyk on July 17, 2015, 02:37:34 pm

Quote from: John Coloccia on July 17, 2015, 01:46:52 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?

TheAmmoniacal · « **Reply #42 on:** July 17, 2015, 04:41:06 pm »

Quote from: vlad777 on July 17, 2015, 04:19:09 pm

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

Try: "arm and hand"

Fungus · « **Reply #43 on:** July 17, 2015, 04:49:57 pm »

Quote from: AF6LJ 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.

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?)

free_electron · « **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.

AlfBaz · « **Reply #45 on:** July 17, 2015, 04:59:21 pm »

Quote from: Fungus on July 17, 2015, 04:49:57 pm

Quote from: AF6LJ 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.
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

vlad777 · « **Reply #46 on:** July 17, 2015, 05:02:30 pm »

Quote from: TheAmmoniacal on July 17, 2015, 04:41:06 pm

Try: "arm and hand"

Correct! (It is there.) I like this one:

Dave Turner · « **Reply #47 on:** July 17, 2015, 05:31:54 pm »

How about the Emperor's new sleeve?

PGrant · « **Reply #48 on:** July 17, 2015, 06:11:45 pm »

Quote from: rs20 on July 17, 2015, 01:45:25 pm

Quote from: PGrant on July 17, 2015, 01:36:22 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. . .

Alvin · « **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.


EEVblog Main Site	EEVblog on Youtube	EEVblog on Twitter	EEVblog on Facebook	EEVblog on Odysee

Author Topic: EEVblog #768 - Cordless Anti-Static Wristbands BUSTED! (Read 50344 times)

Share me