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A New Take on the Classic Pass Labs D1 with an ESS Dac
A New Take on the Classic Pass Labs D1 with an ESS Dac
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Old 28th January 2012, 07:47 PM   #871
opc is offline opc  Canada
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A New Take on the Classic Pass Labs D1 with an ESS Dac
Very nicely done! Wow!

You must have a pretty decent home etching setup!

Post some pictures with the completed unit when you get it all done. I'd very much like to see how it turns out.

Cheers,
Owen
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Old 29th January 2012, 01:45 AM   #872
qusp is offline qusp  Australia
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i would not use te 0.97.5-99s parts or at least retest. i did not get anything this high testing 150+ devices, my guess looking at those numbers is that low and fluctuating temperature has played a part, as overall mine were grouped closer than that. maybe you got a batch that was particularly high, but it seems unlikely. in fact even .95,96 was only encountered in error in a few which was lower when retested. particularly since you have some that are very low by my group too

nice work on the PCB, looks good!

Last edited by qusp; 29th January 2012 at 01:51 AM.
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Old 29th January 2012, 02:40 PM   #873
Algar_emi is offline Algar_emi  Canada
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A New Take on the Classic Pass Labs D1 with an ESS Dac
The FET was getting barely warm with 24V on R1. R1 was much hotter. Maybe my heatsink was too big and the FET wasn't warming up enough. I'll retest in the actual circuit with the cut to lenght heatsink.
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Old 29th January 2012, 09:18 PM   #874
Algar_emi is offline Algar_emi  Canada
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A New Take on the Classic Pass Labs D1 with an ESS Dac
PCB almost completed. Still missing the parts from Mouser.
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Old 30th January 2012, 12:12 AM   #875
Algar_emi is offline Algar_emi  Canada
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A New Take on the Classic Pass Labs D1 with an ESS Dac
Hi. I'm still not ready to sell any match pairs. As I said on the post, I want to retest all of them in the actual circuit first. It may take me 1-2 weeks before I'm ready. I'll post it here when I'm ready. I won't warranty anything, because I want to be sure you'll get two good pairs. BTW I'll accept PayPal with 3% fee, and yes I'll ship worldwide.

Thanks...
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Old 30th January 2012, 11:30 PM   #876
Algar_emi is offline Algar_emi  Canada
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A New Take on the Classic Pass Labs D1 with an ESS Dac
Output coupling capacitor question: The final schematic is showing 1800uF electrolytic output cap, in parallel with the 22uF film cap. Do I need these electrolytic caps? Tx. Original D1 used 220uF bypassed by 0.047uF film.

Last edited by Algar_emi; 30th January 2012 at 11:41 PM.
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Old 31st January 2012, 12:00 AM   #877
qusp is offline qusp  Australia
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no, these are optional in case someone wants to save a bit of cash i guess. just use the film sized to give best 3db point vs your amps input Z, i'm using 4.7uf auricap bypassed with 0.1u copper/ptfe
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Old 31st January 2012, 12:03 AM   #878
Algar_emi is offline Algar_emi  Canada
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A New Take on the Classic Pass Labs D1 with an ESS Dac
Tx
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Old 6th February 2012, 12:27 AM   #879
Algar_emi is offline Algar_emi  Canada
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A New Take on the Classic Pass Labs D1 with an ESS Dac
Almost ready to start mounting everything into an enclosure. I recycled a Cambridge Audio DVD that I had and stop to work years ago. I removed all the junk from it, and this will make a nice case.

I kept the player small headphone amplifier output PCB. I'll connect it to the single ended output. It is probably not good, but at least the front panel will look perfect.

You can see the Antek power transformers, the D1 and its heatsinks, the original Twisted Pear Ballsie balanced to single-ended converter, their LCBPS bi-polar supply for the Ballsie, and my small TentLabs 6.6V shunt reg for the ESS Dac Va supply.

It should all fits nicely.
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Old 7th February 2012, 05:04 PM   #880
pinnocchio is offline pinnocchio  Canada
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Default Me wants boards!

Hi Owen,

Please put me down for 2x NTD1 PCBs

Any marched mosfets left?

Ciao!
Do
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