A New Take on the Classic Pass Labs D1 with an ESS Dac - Page 10 - diyAudio
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Old 15th April 2010, 10:16 AM   #91
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lauret, jkeny, qusp and toufu: you have or will receive PM.

All the others - I regret to say, demand exceeded supply... my spares are gone.

I am prepared to make the files available if somebody wants to organize a group buy for DIY use. Just PM me. Thank you and happy building.

Pierre
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Old 15th April 2010, 10:23 AM   #92
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Quote:
Originally Posted by igwt View Post
Pierre , have you experienced any turn-on/off transiant thumps with this setup?
A faint "click" sound at turn on, coming either from the DAC, the I/V or a combination of both. Not enough to warrant a muting circuit in my case. My speakers are medium sensitivity PHL 1340 MTM.

Pierre
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Old 15th April 2010, 03:17 PM   #93
qusp is offline qusp  Australia
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pierre, the click is the muting relay on the buffalo
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Old 16th April 2010, 12:09 AM   #94
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Quote:
Originally Posted by qusp View Post
pierre, the click is the muting relay on the buffalo
Good to know. Thanks !
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Old 16th April 2010, 02:41 AM   #95
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Quote:
Originally Posted by qusp View Post
pierre, the click is the muting relay on the buffalo
No, that's a Buffalo24 in his setup. There is no output stage and no muting relay on that board.

If you are using balanced signals into and out of the D1 you should get little transient if any. This is because the transient will be almost all common mode. It's only single ended where you could run into problems.

Cheers!
Russ
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Last edited by Russ White; 16th April 2010 at 02:43 AM.
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Old 16th April 2010, 03:18 AM   #96
qusp is offline qusp  Australia
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ahh ICIC why not Russ?, why not?
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Old 16th April 2010, 01:35 PM   #97
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Russ is right. This is the original Twisted Pear ES9008 board. I like it so much I feel no urge to upgrade this part of my system. At least no yet

The D1 I/V circuit is Nelson Pass's simple, elegant idea of a discrete I/V converter. Thank you, Mr Pass! It is generic and I would not hesitate to mate it with the ES9006, -8, -12, or -16. (Obviously it is not applicable to the voltage output ES9022.)

Running single ended output, there is absolutely no thump at turn on and (perhaps) a very tiny one at turn off. No worries. Of course if you are running balanced, the thing is dead quiet.

Pierre
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Old 16th April 2010, 05:17 PM   #98
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Quote:
Originally Posted by PierreQuiRoule View Post

Running single ended output, there is absolutely no thump at turn on and (perhaps) a very tiny one at turn off. No worries. Of course if you are running balanced, the thing is dead quiet.
Did you mean here single ended output with differential input or single ended input? As in using one balanced board for stereo connection.
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Old 16th April 2010, 05:52 PM   #99
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Quote:
Originally Posted by lauret View Post
Did you mean here single ended output with differential input or single ended input? As in using one balanced board for stereo connection.
I simply listened to the +M output referenced to ground, leaving the balanced input unchanged.

Some have asked about using one balanced board for stereo (e.g. using +in and +M for left channel and -in and -M for right channel). At quick glance, it appears to simply require replacing the differential volume pot and output cap C43 by two pots to ground, and two caps to ground. It looks straightforward (no physical changes to the pcb) and I would expect the circuit and board to work this way.

However, you need a single ended output DAC to go that route. Now note that the ES9008 has differential outputs, and that some well regarded commercial products use single ended output DACs in differential mode. There must be a reason - and I would guess that it helps noise rejection.

In DIY land, all the fun is in trying things and being surprised.

Hoping this helps...

Pierre

PS: I am going to be offline for a couple of days.
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Old 1st May 2010, 01:44 AM   #100
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For those interested in D1 variants, an older, yet relevant thread with comments from Mr Pass can be found here:
modifying the D1 I/V stage (X?, CCS?).

Pierre
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