Friedman BE 100 cloned boards

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Friedman BE 100 cloned boards

Postby aa.electronics » 07 May 2017, 14:05

Guys, if someone is interested, me and some guys from the SloClone forum traced the BE100/SS100/JJ100 board.

These are the specs:

- 2 oz/ft copper, 2 layers
- 3 mm thickness
- black board, white silkscreen
- IPC-A-600G class II quality
- Dimensions are 558x74 mm
- bigger traces wrt Friedman in order to get me close to 20 AWG corresponding cross sectional area
- component holes that fit turrets, so that it's possible to use a PCB-turret board hybrid style
- two big ground pads on top and bottom layers like in the Friedman board
- additional grounds and 12V connection points

Shoot me a pm if you're interested.
AA Electronics

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Re: Friedman BE 100 cloned boards

Postby brejna » 08 May 2017, 13:51

Good to here this.. Do you have any buildocs and buildreports?

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Re: Friedman BE 100 cloned boards

Postby aa.electronics » 08 May 2017, 20:57

Shoot me an email
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Re: Friedman BE 100 cloned boards

Postby Dirk_Hendrik » 09 May 2017, 13:45

Class 2 —
Dedicated Service Electronic Products: Includes communications equipment, sophisticated business machines, and instruments where high performance and extended life is required, and for which uninterrupted service
is desired, but is not critical. Certain cosmetic imperfections are allowed

Source: IPC-A-600G

Question:
What did you do in your design process to ensure this Class 2 rating you gave your board??
Sorry. Plain out of planes.

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Re: Friedman BE 100 cloned boards

Postby aa.electronics » 09 May 2017, 20:49

The IPC-A-600G standard refers the manufacturer quality of the board. Basically it classifies the presence of:

- burrs and nodules
- copper voids
- fiberglass protrusions
- dielectric removals
- internal foil cracks

Where Class 1 is the base quality and Class 3 is military quality. Just to give you an example, let's take copper voids (where the copper plating in the barrel is damaged and exposed the dielectric material of the PCB): Class 1 allows three voids per hole in 10% of the holes (6012) or 5% of the holes (A-610). Class 2 allows 1 void in 5% of the holes. Class 3 and 3/A allows no voids. (Source: http://www.circuitnet.com/experts/86649.html)
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Re: Friedman BE 100 cloned boards

Postby Dirk_Hendrik » 11 May 2017, 17:04

Thanks for the explanation. I know. I spent quite some time in IPC standards. G is obsolete btw. We're at J now ;)
But it seems you fail to see the essence of the IPC classification. You define the class. After that this IPC standard will help you to verify the constraints for that class are met. Therefore a board cannot be class 1, 2 or 3. It's manufactured to comply with the constraints set for a specifc class. It's a nuance but an important one.

Let me give you an example:
In your application would the use of FR1 (that's the brown stuff) base material do? I'd say no since the environment for FR1 in your application is rather harsh. Especially when it comes to temperature characteristics. Now, try to find any mention in your G standard of the use of FR1 type base material. It's not even there. Paragraph 2.2 may suggest one needs epoxy woven base material but does not set it as a requirement. Therefore an FR1 board can be used for a class 1,2 or 3 device. Would you do so for your application?

So, The IPC classification helps you to design and manufacture according a class standard but does not make the board that class. It matches all applicable constraints for that class.
Sorry. Plain out of planes.

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