A New Take on the Classic Pass Labs D1 with an ESS Dac - Page 127 - diyAudio
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Old 2nd November 2012, 08:57 AM   #1261
ccliu is offline ccliu  Taiwan
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Old 2nd November 2012, 09:31 AM   #1262
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Old 2nd November 2012, 10:00 AM   #1263
tehrkn is offline tehrkn  Greece
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Old 2nd November 2012, 05:43 PM   #1264
opc is offline opc  Canada
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Hi Guys,

Matching is complete! The results are quite good in the end, and very tight matching was achieved for all 45 sets.

Naturally, when sorting parts like this, some sets are going to be better than others (some sets have a very tight match and very high average TC) so I will distribute the sets in the order in which the payments were received. In short, the first people to have paid will get the best sets. This will result in a pretty random distribution, and reward those who paid promptly.

It's easy to get hung up on this, so let me assure everyone that of the 45 sets, there isn't actually a bad set. Absolutely every set is matched to a minimum of +/- 1mS of transconductance, which is extremely tight matching. As a comparison, I ran the numbers on what people would have gotten if I had just shipped the mosfets directly from the rails, and you'd be lucky to get matching of within +/- 10mS with some sets as bad as +/- 25mS.

The average transconductance is also not really of much consequence overall. There's a small chance you could measure the difference between a perfectly matched set of 0.99S fets and a perfectly matched pair of 0.92S matched fets, but it would likely be less than 1dB. Compare this to using another fet like the IRF510 and you're looking at a meager 0.37S which makes a very easily measurable difference.

Here is all the data for the mosfets, sorted by descending transconductance, and in order of measurements for comparison:

https://docs.google.com/spreadsheet/...0hPSzRhQkN4MVE

Here is the final list showing the 45 sets, a few of the option sets, and the final matching of each set:

https://docs.google.com/spreadsheet/...BOFBYekE#gid=0

This weekend I will be getting everything packed into parcels to go out to each distributor on Monday, and I will also be shipping out all the Canadian orders early next week.

Cheers,
Owen
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Old 2nd November 2012, 06:48 PM   #1265
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Thanks owen i was a late starter on this thread and appreciate all the work you are doing and the great updates !!
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Old 5th November 2012, 11:44 PM   #1266
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can i still sign up for the keratherms ? How many do we get for one order ? Any indic of price ?
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Old 5th November 2012, 11:46 PM   #1267
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Quote:
Originally Posted by kasey197 View Post
can i still sign up for the keratherms ? How many do we get for one order ? Any indic of price ?
Just put your name on the list. It is currently an interest list to see how many wants then we'll most probably start a new thread for a GB if the parties are in agreement.

Thanks
Do
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Old 5th November 2012, 11:52 PM   #1268
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Old 6th November 2012, 06:53 AM   #1269
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Old 6th November 2012, 08:51 AM   #1270
qusp is offline qusp  Australia
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OK I say we leave this open till Friday, it would be good if we could get more on the enclosure list. from someone who has built this, I can tel you an appropriate case is half the battle with this build, it will not fit in your average dac case, particularly if you go to town a bit on supplies for the dac and clocking/i2s conversion. the case I linked earlier in the thread is about as perfect as it gets

Click the image to open in full size.


we can get it with the heatsinks tapped for mounting 1 X NTD1 with salas shunts, or 2 x NTD1. faceplate can be milled for a display, comes with an internal wall (and an internal floor I think) and all fasteners. rear panel can be customized. hes open to discounts if we can get the numbers and it can be customized for our build. I think its quite attractive too. otherwise, particularly those building dual mono, you really have to look at poweramp cases to get enough heatsink and I want my dac to look like a dac

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Coolhead
ccliu
macfixer
tehrkn
Blitz


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Bigpandahk
reenberg
lwif
atom6422
crazikid
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hirez69
lm1no2
Coolhead
ccliu
macfixer
tehrkn

Keratherm

Pinnocchio
bigpandahk
Reenberg
Rolle
hirez69
lwif
atom6422
crazikid
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MisterRogers
lm1no2
Coolhead
ccliu
macfixer
tehrkn
kasey197
Blitz

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Last edited by qusp; 6th November 2012 at 09:00 AM.
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