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Old 13th April 2010, 10:56 PM   #81
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Default Yet another D1 I/V clone

Very interesting thread!

As it turns out, I have been using a D1 I/V stage with an original buffalo DAC for about a year now. Sound is laid back, with layers and layers of detail. It compares favorably to anything I have heard.

As Owen pointed out, new DACs like the ESS swing more current than the PCM63. Referring to the original schematic, I made the following changes to increase bias threefold:
- R26, R33 decreased from 3.3 K to 1 K
- R27, R34 decreased from 1.5 K to 470 ohms

To keep the same cutoff frequencies (RC) for the low pass filters, the following capacitors were adjusted accordingly:
- C40, C45 increased from .01 to .033 uF
- C15, C16 increased from .0027 to .0086 uF

I could not trim the output voltage to 1.65 V without reducing R24, R31 from 100 K to 68 K. The rest of the D1 I/V circuit is stock. Never had the imagination of trying it without the buffer stage. Now I'm curious...

Let me see if I can attach a picture in my next post.

Pierre
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Old 13th April 2010, 10:59 PM   #82
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I hope an image shows up (fingers crossed)...

Pierre
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Old 14th April 2010, 08:20 AM   #83
lauret is offline lauret  Netherlands
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Quote:
Originally Posted by PierreQuiRoule View Post
I hope an image shows up (fingers crossed)...

Pierre
Thanks for your report on modifying an original D1 for the Buffalo DAC!

BTW. Did you make those boards? Got any left?
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Old 14th April 2010, 10:45 PM   #84
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Quote:
Originally Posted by lauret View Post
Thanks for your report on modifying an original D1 for the Buffalo DAC!

BTW. Did you make those boards? Got any left?
Yes I made those board, and I have a few left - strictly for DIY use. Send me PM if you are interested. I'll sell below cost. Just glad if they end up playing music instead of gathering dust.

Pierre
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Old 15th April 2010, 01:27 AM   #85
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Here's a picture of a naked pcb. Nothing fancy: connect ESS Sabre to input (+IN, -IN), provide power (+30, G, -30), and hook outputs (+M, -M) to XLR connector. You may connect an external volume control (+VOL, -VOL), trim volume with a pot, or skip that portion of this circuit if you prefer. Part numbers match the D1 schematic.

I have a few pcbs left, available on a first come first served basis.

Pierre
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Old 15th April 2010, 04:10 AM   #86
igwt is offline igwt  United States
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Pierre , have you experienced any turn-on/off transiant thumps with this setup?
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Old 15th April 2010, 04:33 AM   #87
toufu is offline toufu  United States
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I will take one... you have pm
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Old 15th April 2010, 04:41 AM   #88
qusp is offline qusp  Australia
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me too, YGPM, maybe 4 if you have enough; enough for 2 balanced dacs. actually if you have 8 would be awesome, because I have plans to go dual mono in the future and the other person already is.

Last edited by qusp; 15th April 2010 at 04:53 AM.
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Old 15th April 2010, 05:52 AM   #89
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I would like two please.

Will send PM

Last edited by flocchini; 15th April 2010 at 06:00 AM.
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Old 15th April 2010, 11:09 AM   #90
lauret is offline lauret  Netherlands
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A bit redundant probably, but you got PM.
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