A New Take on the Classic Pass Labs D1 with an ESS Dac

[opc]

Hi Guys,

Looks like all the payments are more or less in, give or take one or two who don't look like they'll pan out.

That might mean you get a board after all Magsy

I ran into a hitch with the matching test setup that was resulting in some misleading measurements, so there is a small setback as a result. I traced the problem, back to a faulty multimeter that was giving an accurate reading, but was loading the very sensitive G-S connection throwing everything off by a small amount.

Nonetheless, I've got it fixed, and I'm now getting very similar results to my first test setup, but this setup controls for temperature much more effectively.

I'll be posting the updated results in the following spreadsheet for anyone interested in taking a look at what a large lot of mosfets looks like in terms of matching

https://docs.google.com/spreadsheet/...maTU3V1E#gid=0

I got back through 40 devices in a day, so I should be ready to ship everything out at the end of this week if I can maintain that pace.

I'll post some pictures of the test setup as well sometime tomorrow for anyone interested.

Cheers,
Owen

[qusp]

haha yeah I had that, thats why I ended up using the difference amp in the end because it had such high input impedance it didnt load it.

so guys I guess its time to see if anyone else is interested in Zfoils, sorry Hirez69, didnt find the PM till I saw your post. for now there is only a few people who have contacted me, I would prefer to have a few more people to make it worthwhile.

so what else are we going to try to GB to get the price down, any consensus on caps etc?

[MisterRogers]

Hey Qusp - you can count me in on ZFoils.

[Rolle]

Hi Qusp

count me in on the zfoils aswell - thanks

[pinnocchio]

Hey Qusp,

I had given you the go for the zfoil for me. I'd love to see your caps suggestions.

Thanks
Do

[qusp]

yes Do I know, but 4 people did not really constitute much of a group buy so i'm posting here. i'm running auricap 4.7uf bypassed with 0.1uf Vcap CuTF and that is what I would intend to replicate, maybe a change on the auricap for something different as they have changed their format these days anyway, so I cant easily get the same caps, but I dont really feel there is a better class of bypass cap than the CuTF, Duelunds are just too insanely priced and way too physically huge

[pinnocchio]

Originally Posted by qusp

yes Do I know, but 4 people did not really constitute much of a group buy so i'm posting here. i'm running auricap 4.7uf bypassed with 0.1uf Vcap CuTF and that is what I would intend to replicate, maybe a change on the auricap for something different as they have changed their format these days anyway, so I cant easily get the same caps, but I dont really feel there is a better class of bypass cap than the CuTF, Duelunds are just too insanely priced and way too physically huge

I'm good with Auricap, I use them often and like them. I never tried the Vcap CuTF though... I was planning on using a 0.01uF as bypass for another project but never did it...

How many of those Vcap CuTF 0.1uF would we need (Is it 4x for balanced out?). They're not cheap @ over 120$ ea but I do understand they are totally amazing! Would those Russian Teflon be good as well? Never tried those either...

Thanks
Do

[lenconian]

Hi, this whole project sounds extremely interesting.
I've started at page 1 and then quickly skipped to the end, I see there is a group buy going on ( is it still?) and I'm worried to be missing out, so sorry for a question I could have answered myself by reading the whole thread. I'm just scared I'm not gonna be fast enough

So, would someone be kind enough to answer these?
-Are the PCBs still available?
-How much is a PCB?
-How much would it cost, to put it all together?

Thanks very much, I'm back to reading...

[Rolle]

Originally Posted by Woresseo

Added myself and a quick reference about the GB

Siliconray RE3220WH Enclosure GB
See post #1005 for details. We need a minimum of 20 units to make this enclosure GB possible.

qusp = 1
hochopeper = 1
opc = 1
pinnocchio = 1
woresseo = 1
______________
total = 5

Is the potential GB for the enclosure dead? I would also be interested - but seems long way to reach the min qty of 20

Best Regrads
Søren

[MisterRogers]

Auricap would be acceptable for me too.