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Interest for GB for MarcelvdG valve DAC
Interest for GB for MarcelvdG valve DAC
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Old 19th October 2017, 10:41 PM   #1
leadbelly is offline leadbelly  Canada
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Location: Calgary, Alberta
Default Interest for GB for MarcelvdG valve DAC

This thread is to gauge interest in PCB's and/or major parts for MarcelvdG's valve DAC as published in Linear Audio 13.

Discussion thread here:
Valve DAC from Linear Audio volume 13

Article for purchase here:
Linear Audio | your tech audio resource

Design package download here:
Downloads | Linear Audio

Pictures here:
DAC gallery

Note that this is a relatively expensive project, the Jensen signal transformer is $USD137 for 1 piece, and the FPGA board is $EUR225 for 1 piece, let alone all other components, so please consider that before expressing interest.

At this point, just please cut and paste the following text into your post and add your name and quantities desired:

Member PCB set Transformer FPGA
leadbelly 1 1 1
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Old 20th October 2017, 11:21 AM   #2
MarcelvdG is offline MarcelvdG  Netherlands
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The signal transformers are optional: you don't need them for the unbalanced variant, nor for the balanced version when you only drive balanced inputs with it.
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Old 20th October 2017, 02:41 PM   #3
32y0 is offline 32y0  Netherlands
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Hmm, really interesting. Any idea on the prices when numbers go up?
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Old 23rd October 2017, 05:54 AM   #4
bvtrinh is offline bvtrinh  United States
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Default One

Member PCB set Transformer FPGA
leadbelly 1 1 1
Bvtrinh 1 0 1
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Old 24th October 2017, 08:25 AM   #5
leadbelly is offline leadbelly  Canada
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OK, I received some information back, so we can clarify what costs are looking like.

I received what I think is a good PCB quote from 1 of 2 manufacturers that I submitted to. It looks like the as-delivered cost to me for a PCB set (main & filter boards) is $USD45 based on 15 pieces.

The main board is 2.0 mm FR4, 4 layer of 1 oz copper, 264 * 329 mm, immersion gold surface finish, green solder mask top & bottom, white silk screen top & bottom.

The filter board is 1.6 mm FR4, 1 layer of 1 oz copper, 294 * 160 mm, HASL surface finish.

Budgeting a generous $USD15 for all other costs, assume a total $USD60 cost if we can get 15 to join.

As for the FPGA board, since the price break for 10 units is merely 10% for 10 units, I am thinking it is not worth including in the group buy. Remember there are negatives with a group buy such as costs of shipping twice, risk of loss or damage by shipping twice, and inconvenient manufacturer warranty claim. This decision can await final group buy numbers.

I contacted Cinemag, and they do not have a close, stock substitute for the Jensen, it would have to be a custom. I would think that a custom would not be a big savings, if any, from the Jensen unit. The Jensen unit does discount 15% in price for 12 units, but since it is only used for 1 of 3 build options for the filter board, I would not be surprised if we never get to 12 units.
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Old 24th October 2017, 10:36 AM   #6
32y0 is offline 32y0  Netherlands
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Thanks for the update!

Member PCB set Transformer FPGA
leadbelly 1 1 1
Bvtrinh 1 0 1
32y0 1 0 0
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Old 24th October 2017, 10:44 AM   #7
pluplog is offline pluplog  Singapore
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Bought the paper and having a read through, it's very interesting so far!

Member PCB set Transformer FPGA

leadbelly 1 1 1
Bvtrinh 1 0 1
32y0 1 0 0
pluplog 1 0 1
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Old 24th October 2017, 07:26 PM   #8
MarcelvdG is offline MarcelvdG  Netherlands
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Quote:
Originally Posted by leadbelly View Post
The Jensen unit does discount 15% in price for 12 units, but since it is only used for 1 of 3 build options for the filter board, I would not be surprised if we never get to 12 units.
When you choose the option with signal transformers, you need two of them per DAC (one left and one right), so it boils down to six people wanting to build the most expensive variant. Nonetheless I also wouldn't be surprised if we never get there.
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Old 24th October 2017, 07:27 PM   #9
MarcelvdG is offline MarcelvdG  Netherlands
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Quote:
Originally Posted by pluplog View Post
Bought the paper and having a read through, it's very interesting so far!
I'm glad to read that you like it!
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Old 2nd November 2017, 01:34 AM   #10
pinnocchio is offline pinnocchio  Canada
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This is a really nice project, very interesting I find.

The main PCB (210mm * 297mm) with 4 layers, 70um (2mm) thick and inner layers at 17um can be obtained at FirstPCB. For Qty 5 it cost 160$ USD and with gold immersion 190$ USD for 5 pcs.

I used FirstPCB many times and they do superb PCBs. Don't know if the specs you're looking for though.

Thanks
Do
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