Author Topic: EEVblog #651 - Mailbag  (Read 16090 times)

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Offline ivaylo

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Re: EEVblog #651 - Mailbag
« Reply #25 on: August 14, 2014, 02:13:34 am »
Intermec used to make the cutest industrial portable computers running MSDOS and even Windows. My first job in the states in the late 90s was in a paper mill where the fork lifts were equiped with those with a bar code scanner able to read like 20m away, (not kidding) and all connected via radio across the multi acre factory floor. Hadn't seen wifi at the time I thought that's the coolest thing ever.
 

Offline edpalmer42

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Re: EEVblog #651 - Mailbag
« Reply #26 on: August 14, 2014, 02:57:52 am »
...  the two wrist straps in that medical device look like they have snap fasteners for the cables.  If the snaps are the right size, you've got two of the best quality wrist straps around. ...

Er... no, for at least two reasons.

First, they're metallic. Think short circuit.

Second, they are unlikely to have the required resistor in circuit between the bracelet and the strap.

There are many metallic wrist straps.  Some have insulating covers over the outside, some don't.  If you're using it on unpowered equipment it doesn't matter, but you're right that it wouldn't be appropriate on live equipment.  I guess it's possible that there's a clear insulating film on the ones in the video, but it doesn't seem likely.

AFAIK, the required resistor is always in the cord, never the wrist strap.  My thought was to use those wrist straps with the cord for a regular anti-static strap.  That's why I made the comment about the snap.  Guess I phrased it poorly.

Ed
 

Offline German_EE

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Re: EEVblog #651 - Mailbag
« Reply #27 on: August 15, 2014, 05:25:21 pm »
All agreed.

I had a workshop job once where we were all issued with company watches, these had a metal wristband and the usual circular connector for the anti-static cord. The 1M resistor is ALWAYS in the cord, well, sometimes in the connector for the cord but you get the idea. This is because some equipment has attachment points on the chassis for a wrist strap.
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.

Warren Buffett
 

Offline nitro2k01

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Re: EEVblog #651 - Mailbag
« Reply #28 on: August 16, 2014, 04:38:39 am »
Upside-down oscilloscope on the shelf - the electrons will fall out!!!
No, he's in Australia, remember. That's actually his only 'scope with all its electrons intact. ;)
Whoa! How the hell did Dave know that Bob is my uncle? Amazing!
 

Offline coppice

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Re: EEVblog #651 - Mailbag
« Reply #29 on: August 16, 2014, 07:43:23 am »
What PCB autorouters existed in 1985?

PC-based:

Altium (Protel)
P-CAD
ORCAD (maybe not '85)

And probably a lot I forgot..
Those packages may have been available in 1985, but did any of them autoroute in 1985? I know ORCAD only autorouted much later. I'm not sure about the others, but their early versions were intended to be cheap rather than highly functional.
 

Offline boz

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Re: EEVblog #651 - Mailbag
« Reply #30 on: August 21, 2014, 04:50:04 am »
The scanner is very close in function to my open source project, http://hackaday.io/project/1915

If anyone is keen to see how one of these type scanners can be made for sub $100 in 2014 check it out (Warning the project is still work in progress)

The V25 is the microcontroller version of the intel 80186 by NEC had some ROM and RAM and peripheral funcs (I cant remember) its only saving grace was it could run DOS, a bit power hungry as I remember surprised to find it in a handheld.
Fearless diver and computer genius
 


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