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Old 14th March 2006, 03:56 PM   #231
pixpop is offline pixpop  United States
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If it can be got down to about 100mm x 60 mm, it would fit above the input area of the MM board, and would be much more convenient.

Here's an edit of your component layout to show what I mean. Put all the power components at the right end of the board. Put both the input and output at the bottom left, near the input pads of the Pearl MM board.

I currently can't attempt to lay this out, so of course it may be impossible. But it's worth a try.

Also, is all that extra regulation needed? Isn't the regulated supply from the MM board enough, perhaps with just a small RC filter on the MC board? If so, you could eliminate c4, c5, r19, r18, q6, and c13.

Click the image to open in full size.

What do you think?
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Old 15th March 2006, 05:27 PM   #232
promitheus is offline promitheus  Europe
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Well theoreticaly it could be done but practicely its almost impossible.
One more reason that the board is so big is because I made space on the board for a 10uF MKP at the output instead of the 220uF in parallel with the 47nF ( thats C11 and C12). This 10uF cap is soldered to Pads Cap1 and Cap2.
If this isnt needed then the board can become smaller.
The regulation must stay because its needed for low noise levels of the MC preamp.
What do you guys think?
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Old 15th March 2006, 05:44 PM   #233
pixpop is offline pixpop  United States
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Promitheus,

how does your board connect to the Pearl PCB?
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Old 15th March 2006, 06:26 PM   #234
promitheus is offline promitheus  Europe
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Well my first thought was to take 29V from R8 on the right side of the board.
If I take the caps out you have to take 28,8V from R13 and Ground from the star ground near C15.

I hope thats what you asked.
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Old 15th March 2006, 07:31 PM   #235
pixpop is offline pixpop  United States
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Actually, I meant the signal, not the power. Does it connect in to the MM input of the Pearl?
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Old 15th March 2006, 07:56 PM   #236
promitheus is offline promitheus  Europe
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Yes just like the Aleph ONO.
MC output goes into MM input.
Should I put at DIP Switch at the output to select between MM and MC?
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Old 15th March 2006, 08:49 PM   #237
pixpop is offline pixpop  United States
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If there's a switch on board, then perhaps it would be best to connect both MM and MC inputs to the MC board, and use the switch to route either the MM input, or the output of the MC, to the MM input of the Pearl.

But folks might prefer to have a switch on the back panel of their Pearl box. The wiring for that would be much more ugly. In this case, the MC input would run from the RCA connector, to the MC board, then back to the switch. The MM input would run from the RCA connector to the switch.

Do you have a copy (or link) of the Ono schematic? I've been looking, but can't find it. I thought I had it at one time.
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Old 15th March 2006, 09:14 PM   #238
promitheus is offline promitheus  Europe
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Mail me and give me your email address
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Old 15th March 2006, 10:41 PM   #239
pixpop is offline pixpop  United States
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It's OK. I finally found it. It was on my work computer, but not my home one.

I think the dip switch (like the Ono) to bypass the MC stage would be a good idea.

I was thinking of a design for 2 turntables connected at once, one MM and the other MC, and a switch to select between them. But that's probably way to complicated for most folks.

I will have to mount the MC boards in a separate box, as they won't fit in my Pearl box. Maybe I could run an extra cable from my Pearl unregulated supply.
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Old 15th March 2006, 11:08 PM   #240
promitheus is offline promitheus  Europe
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So I made a new version of the board.
It can be mounted on top of the Pearl board.
You can use the same screw in the below right corner of the Pearl board.
Then you need a hole on the Pearl board between C5 and C9.
In the other corners you cant make holes but you can use Pcbs mounts which are glued.
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