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Old 11th March 2006, 11:56 AM   #221
Buhl is offline Buhl  Denmark
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That sounds absolutely nice, Promitheus - I'll take three sets in pre order - no matter the look ! I use small standoffs with 3mm internal threading, so I am playing with the idea of using those to stack on top of each other, so I can mount the MC input board directly on top of the MM input stage.

Cant wait to se your outcome !!


Keep it up...
Cheers !
Hans
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Old 11th March 2006, 12:17 PM   #222
promitheus is offline promitheus  Europe
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Hi,

I am working on the board and almost have the Layout done.
I am still trying to find a solution on how to mount the MC Stage ontop of the Pearl.

What did you have in mind?

It wil also be alsmot as tall as the Pearl itself because it has 3 same 3300uF capacitors like on the Pearl.
I used the circuit from the Aleph Ono with Gain selection and buffer at the output.

See attachment below.
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File Type: pdf pearlmc.pdf (63.2 KB, 210 views)
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Old 13th March 2006, 06:58 PM   #223
promitheus is offline promitheus  Europe
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A small look at the boards so far.
What do you think?

The real size is 80 x 120 mm (3.15" x 4.8")
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File Type: pdf pcbmc.pdf (39.0 KB, 159 views)
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Old 13th March 2006, 07:12 PM   #224
promitheus is offline promitheus  Europe
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Here is the bottom layer
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File Type: jpg bottomlayermc.jpg (57.1 KB, 672 views)
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Old 13th March 2006, 07:15 PM   #225
promitheus is offline promitheus  Europe
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Top Layer
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File Type: jpg toplayermc.jpg (84.1 KB, 695 views)
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Old 13th March 2006, 07:17 PM   #226
promitheus is offline promitheus  Europe
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Parts Layout
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Old 13th March 2006, 08:09 PM   #227
Buhl is offline Buhl  Denmark
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Hello Ilias - I think it looks good, although I dont have very much experience in judging PCB layout - nice with groundplane covering everything... Also nice with the "mouse piano" for adjusting input impedance....

About the stand off problem, I have assembled a small mock up showing the idea I had using PCB standoffs stacked on top of each other. You will need about 34mm to get clear of the 3300uF caps, that seems to be the tallest part around the input stage - each standoff I use on the picture is 12mm high, thus three should do th trick - this is only to show my idea.


Cheers !
Hans
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Old 13th March 2006, 08:53 PM   #228
pixpop is offline pixpop  United States
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My Pearl box is pretty big: 8 x 12 x 3 inches, but I don't think there will be room for these boards. All the floorspace in the box is taken up with the Pearl PCBs, so my only choice would be to stack the MC boards. But if they have more of the 33000 caps standing vertically, It will be very tricky to fit it in the 3 inches of height.

Is it possible to make the caps lie flat, instead of standing up?

Hans, are you thinking of having the caps between the two PCBs?
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Old 13th March 2006, 09:00 PM   #229
pixpop is offline pixpop  United States
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I was thinking that it could stack above the input stage of the Pearl. The Pearl components there are not very tall.

The MC inputs and outputs would be above the MM input pads on the Pearl. The power connection would be at the other end. Perhaps there's a spot on the Pearl PCB where a second mounting hole could be drilled, that would align with one on the MC board.
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Old 14th March 2006, 06:17 AM   #230
promitheus is offline promitheus  Europe
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Well I know the MC Boards are big but I cant find another way to make them fit better.
I made the board as compact as possible.
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