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"The Wire" Official Boards for All Projects Available Here!  BAL-BAL, SE-SE, LPUHP
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Old 11th October 2017, 01:12 AM   #1041
bimmer100 is offline bimmer100  United States
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Join Date: Dec 2015
Location: Everett
Does anyone have any of these boards laying arond for sale? I would buy 3-4 dozen of them if I could. I would hope to hear from Owen, but assume he has no longer been buidling these or selling. I wish the PCB design would be open for use of the public. I would sell these If I could get permission from Owen. Has anyone talked with him recently?

This is such a great design and sadly hate to see this not be put to good use.
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Old 15th October 2017, 06:06 PM   #1042
Sabrosa is offline Sabrosa  United States
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Join Date: Jun 2010
I picked up a curve tracer to make transconductance testing and matching easier and should have some results soon. Since setting Vds correctly is important for the curve tracer measurements, I wanted to double check that my calculations are correct.

With Rs = 7, Rd = 2.8, and supply rail of +/-6V, current through the MOSFET is (1.65 + 6)/7 = 1.0929A. Then using the drain-source loop KVL, 6 - (7 * Id) - Vds - (2.8 * Id) = -6, so Vds = 12 - (9.8 * 1.0929) = 1.29V

This checks out since you're biasing at the source for the 1.65V DAC offset and Vd = 6 - (1.0929 * 2.8) = 2.94V, so Vds = 2.94 - 1.65 = 1.29V.

LTSpice seems to confirm this is correct, but let me know if I've made any mistakes.
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Old 20th October 2017, 07:14 PM   #1043
Stammheim is offline Stammheim  Germany
diyAudio Member
Join Date: Jul 2012
Hi guys,

I have few boards "LT3042 Parallel Regulator" left, of course the original boards from Owen. I'd like to sell them, if anybody needs some. I have also some LT3042 left, which I'd sell. Just PM me...


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Old 25th October 2017, 11:21 AM   #1044
Veggiel is offline Veggiel  Belgium
diyAudio Member
Join Date: Jun 2010
I have some boards still that I never build because I didn't go trough with the projects intended for them.
These are 1 BAL-SE pcb plus 1 PSU v2 and also 3 times The Wire power amplifier v2 pcb including the mosfets.
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Old 24th December 2017, 03:31 AM   #1045
Sabrosa is offline Sabrosa  United States
diyAudio Member
Join Date: Jun 2010
I measured the transconductance of the following logic-level MOSFETs at 1.09A and IRL1404S came out on top at almost 14S.

It's interesting that LTspice distortion simulations don't really correlate with transconductance. I wonder if that's due to simulation and/or model quality and the lack of subthreshold parameters, or if there are other MOSFET characteristics that affect NTD1 distortion measurements other than transconductance.

Model	        Transconductance
IRL1404S	13.9810852
IRL2505S	12.0627706
IRL60S216	11.9672906
IRL3705NS	10.9092788
IRL2203NS	10.2643684
FQB34N20LTM	9.9900624
IRL3713S	9.239449
IRL2910S	9.172273
IRL3803S	8.990884
FQB50N06LTM	8.554364
FQB19N20LTM	8.452541
IRL3103S	8.423891
IRL40S212	8.393629
FQB33N10LTM	8.125394
IRLZ44NS	7.99665
IRL540NS	7.871818
IRLZ34NS	7.082997
FQB30N06LTM	6.194258
IRLZ24NS	5.799751
IRL530NS	5.581292
IRL520NS	4.230913
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Old 16th March 2018, 09:35 AM   #1046
necplusultra is offline necplusultra  Canada
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Join Date: Jan 2011
Location: sitting down
if anybody has LT3042 Parallel Regulator boards for sale, please let me know
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Old 19th March 2018, 08:42 AM   #1047
pos is offline pos  Europe
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Join Date: Feb 2008
Location: Paris
For anyone interested, I have LPUHP v2 PCBs for sale: LPUHP v2 PCBs
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Old 19th March 2018, 11:12 AM   #1048
Nanoloop is offline Nanoloop  Hong Kong
Account disabled at member's request
Join Date: Feb 2013
Location: Beyond Infinity
PM sent :-)
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Old 2nd April 2018, 09:41 PM   #1049
TypodCrow is offline TypodCrow
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Join Date: Dec 2017
Anyone have bal-bal boards/amp they're looking to sell? I'm interested in building one.
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Old 4th May 2018, 02:50 AM   #1050
ZoSoNCSU is offline ZoSoNCSU  United States
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Join Date: Feb 2017
Location: Raleigh, NC
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I am also interested in getting the balanced version of this design if anyone has some to sell.
My Personal HiFi Audio Builds and Reviews (no ads or trackers!) Just HW builds logs, build videos, vintage parts recycling by recertifying them with a Sprague Tel-Ohmike TO-6A, High Res Music, HW Reviews, etc: https://hallmanlabs.com/
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