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Old 30th September 2011, 03:54 PM   #481
Jokener is offline Jokener  Germany
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Its not for you guys, its for me ^^
Some parts have very fragile legs that tend to break off during shipping.
In a hard box that is a non-issue, so all enclosure-buyers will have to look for their kits inside the enclosures.
But in a padded envelope, a DIP8 part might bend a leg or two.
To prevent that, you stick the part in a small piece of foam that protects the legs.
And if you use cheap non-conductive foam that might have a static charge, you fry the component you are trying to protect.
So you work on an ESD-surface that is properly grounded, stick the part in conductive foam that sits on your ESD-surface and then place them in an ESD-bag.
All the while, you wear a cute little armband with a wire that is connected to the SAME ground as the surface you are working on.

All that is done to prevent dead parts from reaching you and to save you trouble.
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Old 30th September 2011, 04:40 PM   #482
Alexium is offline Alexium  Ukraine
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Oh, great! Thnaks for your trouble!

P.S. A slightly off-topic question: is there any way to reduce the risk of ESD when you don't have any way to ground yourself properly?
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Old 30th September 2011, 07:52 PM   #483
Jokener is offline Jokener  Germany
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Don't wear any clothes made from plastics.
(Microfiber underwear is still plastic...)
Do not work on plastic surfaces (kitchen- and living room furniture is often coated with plastic).
Glass, metal or wood are all preferable.

Keep grounding yourself while you work.
If your house uses metal plumbing and water pipes, a kitchen sink works (if it's metal).
Otherwise the heating radiators are usually good for this.

Proper ESD mats, wristbands, brushes and tools are nit expensive.
A mat and a wristband retail for ~20 to 40€.
That's a good investment. It not only saves you the money from fried components.
It also saves you tons of time troubleshooting your stuff for fried components.

Regards,
Jokener
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Old 30th September 2011, 08:12 PM   #484
Alexium is offline Alexium  Ukraine
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Quote:
Originally Posted by Jokener View Post
If your house uses metal plumbing and water pipes, a kitchen sink works (if it's metal).
Otherwise the heating radiators are usually good for this.
I'm living in a multi-flat house. There's a possibility that other habitants are as wise as me and also ground their stuff(refrigerators, washing machines, PCs, ...) to the pipes. Is it dangerous to ground through water pipes in such conditions, or it doesn't prevent ESD from properly sinking?
Thanks for the advice!
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Old 30th September 2011, 10:10 PM   #485
Jokener is offline Jokener  Germany
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I don't think people would ground their home electronics to the piping in the walls.
And you are not really "grounding" anything permanently when assembling your O2.
The amount of energy transfered when you are "fully charged" by static electricity and then touch a grounded radiator/sink... it is minimal.

Regards,
Jokener
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Old 30th September 2011, 11:06 PM   #486
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by Alexium View Post
P.S. A slightly off-topic question: is there any way to reduce the risk of ESD when you don't have any way to ground yourself properly?
Don't worry. None of the components in the O2 build are very sensitive to ESD (possibly only the op-amps). Take of your shoes and don't use an office chair with plastic wheels. Soldering technique is way more critical in practice - IMO.
Cheers,
Nic
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Old 30th September 2011, 11:32 PM   #487
Limp is offline Limp  Norway
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Quote:
Originally Posted by NicMac View Post
Don't worry. None of the components in the O2 build are very sensitive to ESD (possibly only the op-amps). Take of your shoes and don't use an office chair with plastic wheels. Soldering technique is way more critical in practice - IMO.
Cheers,
Nic
There have been reports on blown MOSFETs, so some extra care when handling these could be advisable.

Quote:
Originally Posted by Jokener View Post
The other sheet-metal desing didnt turn out precise enough because the bench press was too large.
And I just didnt feel like driving another 80 miles to get new metal and then spend another day in the shop to build a mini-press (which would cost me 100€ in parts)...
Maybe, in a long and cold winter night, I'll wander around the shop and see the drawing for the press... who knows what happens then?

Regards,
Jokener
No case?

Last edited by Limp; 30th September 2011 at 11:39 PM.
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Old 30th September 2011, 11:40 PM   #488
Jokener is offline Jokener  Germany
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You can be sure they are intact when I ship them out.
The safety measures I have taken should be overkill, if anything.
I can't test every single one of them when they come in, but I trust Mouser and Farnell that they don't sell defective stuff...
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Old 1st October 2011, 05:10 AM   #489
Jokener is offline Jokener  Germany
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@Limp: The case I was talking about was only my own, custom design.
The commercial ones should be just fine, I'll post pictures once I get them.
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Old 3rd October 2011, 08:27 AM   #490
Jokener is offline Jokener  Germany
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Okay. The first cases (black and blue) have arrived.
As did the "Farnell extras" that some people ordered.
Everything is intact and stored safely, waiting for the rest of the orders to arrive.

The black case looks really great. Deep and good black, nice texture.
Comes with lots of black screws, even though they are not very good at cutting their threads into the case.
And their Philips head shape doesn't match any of my screwdrivers. And I live in a car dealership...
But they're black, you can drive them in the case if you're careful and then you're golden.

The blue, I'm not so sure. It seemed darker on the pictures.
If I had to describe it, its halfway between the Mercedes color they call "Deep Sea Blue Metallic" (Tiefseeblau Metallic) and a "Baby Blue Metallic".
Its not hideous, but not quite what I expected.

Pictures will follow tonight once I am back home.
(Oktoberfest right now. Only place where a man can spend 100€ on beer alone and he can still walk to his bed alone... Good times and good thing I have a chauffeur for the trip back home ^^ )

Regards,
Jokener
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