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Valve DAC from Linear Audio volume 13
Valve DAC from Linear Audio volume 13
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Old 14th June 2021, 07:46 AM   #1871
acg is offline acg  Australia
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Join Date: Oct 2013
Location: Sunshine State
Nice stuff Sonny.
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Old 14th June 2021, 04:04 PM   #1872
agent.5 is offline agent.5  United States
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Congrat Sonny. Looks really nice.
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Old 14th June 2021, 05:32 PM   #1873
pgour is offline pgour  Greece
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Location: Athens
Beautiful built, congratulations.
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Old 18th June 2021, 12:31 AM   #1874
SonnyMarrow is offline SonnyMarrow  United States
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Join Date: Dec 2016
I'm getting a decent amount of noise, and I noticed that my circuit ground has about 25-30mV DC in relation to the chassis. I have the ground connected to chassis through a ground isolator (House GND Kit). The DAC is connected to the ground isolator using that middle pad on the filter board connected to the ground plane.

What's even weirder, is when I bypass the isolator by touching a different chassis wire to the ground, there is a little tiny spark. What could be causing voltage to leak into ground?
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Old 18th June 2021, 01:35 AM   #1875
SonnyMarrow is offline SonnyMarrow  United States
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Ignore my post about noise. The connection from the ground of the output board to the ground isolator thing wasn't good. Still don't know why there's a little bit of voltage, but it's fine regardless. I still need to debug the optical and USB, but for now I'm just enjoying it with BNC. Really wanting some nice tubes for it now...
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Old 18th June 2021, 07:13 AM   #1876
acg is offline acg  Australia
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Join Date: Oct 2013
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Looks excellent Sonny. Have been really enjoying the sound of mine while still on the breadboard.
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Old 18th June 2021, 04:36 PM   #1877
Hans Polak is offline Hans Polak  Netherlands
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Join Date: Mar 2005
Location: Blaricum
Sonny,
You are a true mechanical wizzard.
What a meticulous piece of art.

Hans
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Old 18th June 2021, 06:26 PM   #1878
wlowes is offline wlowes  Canada
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Location: Toronto
Truer words were never spoken Hans...
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Old 3rd July 2021, 01:28 AM   #1879
SonnyMarrow is offline SonnyMarrow  United States
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Join Date: Dec 2016
For the life of me, I cannot get USB to work. I'm using a WaveIO (http://www.luckit.biz/documents/WaveIO/WaveIO_Infos.pdf).

I have the J6 header of the WaveIO connected as follows to P9 of the ValveDAC:
Data (DT) to pin 5
Word Clock (LR) to pin 11
Bit Clock (BC) to pin 9
Master Clock (MC) to nothing
Vin (V+) to pin 19
And all grounds are connected to the adjacent P9 grounds

P9 pin 1 is connected to an extra contact on my input selection switch. It is wired so that when USB is selected on the switch, P9 pin 1 is then connected to SW3 pin 5 (GND). SW3 pins 1-4 (the other inputs) are connected to nothing.

P9 pin 3 is directly connected to ground using a jumper to P9 pin 4.

The WaveIO J9 has an L8 pin that is described as a mute function, I don't have that connected to anything.

My PC is detecting the WaveIO and the WaveIO driver is detecting the signal rate of the songs just fine.

EDIT: Upon further testing, I think I have a bridged connection somewhere on the ValveDAC. With nothing plugged into P9, pins 17-20 all have continuity to ground.

Last edited by SonnyMarrow; 3rd July 2021 at 01:47 AM.
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Old 3rd July 2021, 02:17 AM   #1880
SonnyMarrow is offline SonnyMarrow  United States
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The issue appears to be the FPGA? When the FPGA is plugged in, 3.3V on P9 and P7 both connect to ground. When I remove the FPGA, the 3.3V is no longer connected to ground.
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