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Old 5th January 2012, 01:29 PM   #121
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Quote:
Originally Posted by Rudi_Ratlos View Post
Do you think that prototyping is necessary?
I believe it would be a good strategy to prototype first, before ordering a large number of boards. Would it be possible to etch and test the board yourself?

Quote:
Originally Posted by Rudi_Ratlos View Post
What colour should the PCBs have?
I agree with meanman1964 that a black board and red silkscreen would be very nice.

/Mason
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Old 5th January 2012, 03:04 PM   #122
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Mason,

the PCB must be double-sided with plated through-holes.
I cannot do this myself.

That is why I need a small number of "volunteers".

Best regards - Rudi_Ratlos
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Old 5th January 2012, 05:42 PM   #123
AndrewT is offline AndrewT  Scotland
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The prototype PCB or multiple PCBs should be ordered up and the extra costs spread over the whole Group Buy.
You are checking that the PCB traces and pads are where they should be, you are not checking the sound quality.
If some Members volunteer to help out with more thorough stability testing of the prototypes then they should not pay the extra. They should pay the same price as everyone else in the GB, who should share all these extra costs. eg. posting the protos to you, then posting the protos to the volunteers.

The protos do not need to be screen printed, they do not need to be masked, they do not need to be gold dipped, etc.

If 100 PCBs cost $2000 and you spend an extra $30 on 6 protos and an extra $40 on postage then that extra $70 is shared out among 106PCBs @ $2070.

No body makes a profit.
No Member subsidises other Members.
No Member gets free samples.

There is one exception.
The PCB Designer could get a free sample (prototype) that is part of the design and deliver Group Buy of PCBs.
Some might even say the Designer gets a free sample of the finalised PCB for his efforts.
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regards Andrew T.

Last edited by AndrewT; 5th January 2012 at 05:47 PM.
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Old 5th January 2012, 05:46 PM   #124
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I will keep your calculation in mind, Andrew.

Best regards - Rudi
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Old 5th January 2012, 06:42 PM   #125
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Quote:
Originally Posted by AndrewT View Post
The prototype PCB or multiple PCBs should be ordered up and the extra costs spread over the whole Group Buy.
No body makes a profit.
No Member subsidises other Members.
No Member gets free samples.
I definitely agree. For the prototype boards, the cost should be spread across the group. This makes it inexpensive for everyone, and ensures that the final boards are correct. I don't mind waiting if the end result is successful.

/Mason
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Old 5th January 2012, 07:15 PM   #126
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Rudi & Metal,

I think the boards should be kept the same colour (Red) as all your previous boards. They look superb and are easily recognisable as your work.

I also agree with AndrewT regarding the cost as this seems to be fair.

Well done you two.

Regards
Roy.

Last edited by royville; 5th January 2012 at 07:16 PM. Reason: small addition
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Old 11th January 2012, 04:53 PM   #127
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My friend METAL and I finished the layout of Mihai's RMI FC-100, and I will order 10 pcs of this PCB:

Click the image to open in full size.

http://www.abload.de/img/fc-amp_cap35-gerbvh1o2l.png

in best quality: 2mm FR4-pcb, 2-layer, immersion Gold surface finish, this weekend.

We did not yet - during the protyping phase - concentrate on Mihai's PSU, but will use the common DXAmp +/- 35V - PSU
for the backend and a 7815/7915 -based resp. SALAS' shunt regulator based frontend PSU (+/-39VDC).

Fortunately I found 2 German DIYers who will accompany the prototyping.

I will keep you informed and will give you pictures / the status of our progress.

Best regards - Rudi_Ratlos

Last edited by Rudi_Ratlos; 11th January 2012 at 05:00 PM.
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Old 29th January 2012, 09:11 AM   #128
Ferio is offline Ferio  Denmark
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Quote:
Originally Posted by Rudi_Ratlos View Post
What colour should the PCBs have? Red, green or blue soldermask colour with white silkscreen or do you want something special for this AMP?
Black and white or white and Black?
You know this could open an endless discussion

PS: I vote for white
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Old 1st February 2012, 03:34 PM   #129
zsaudio is offline zsaudio  Europe
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Smile any news

Hello Rudi_Ratlos,

Do you have any infos about the PCB?
I'd be interested in 2-4 pieces depending on the price.
I've got all the parts for that beauty PCB
Best Regards,
Zsolt
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Old 1st February 2012, 04:14 PM   #130
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Zsolt,

I ordered 10 pcs of this PCB on January, 17th.

Click the image to open in full size.

http://www.abload.de/img/fc_100_topviewqhecr.png

METAL and I decided to even include the rectifying section on the PCB.
There is no reason why not.

The size of a PCB is 190 x 74mm.

I expect the PCBs to be delivered in the course of the next week.
The delay is due to the Chinese "New Years holidays".

The price per PCB is 18 .
The quality of the PCB is the best that you can imagine (Post #127).
The soldermask is red.

Four of these PCBs are reserved for METAL and me, who will do the prototyping.
I will offer the other 6 PCBs for sale.
I double-checked the layout twice and am absolutely sure, that I did not do any layout-error.

In case you are interested:

Do not waste your time and do a quick and dirty LM3X7 solution for the frontend PSU.

I layouted Mihai's frontend-shunt in the meantime:

Click the image to open in full size.

http://www.abload.de/img/fc-shunt7qe9m.png

and will receive the prototypes of the shunt tomorrow.
The shunt PCB is very compact: 76 x 73mm.
I can sell you the shunt-PCBs as well then (if you need).

Best regards - Rudi_Ratlos
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