High Performance WM8741 Upsampling DAC New Version build thread (show 'n tell too) - Page 13 - diyAudio
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Old 16th March 2012, 03:41 AM   #121
TheGimp is offline TheGimp  United States
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Do you mean these two?

They look like the solder did not flow to the end cap on the resistors.
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Old 16th March 2012, 05:16 AM   #122
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No. I had three arrows and the photo I attached was cropped. I'll have to fiddle with it tomorrow night
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Old 16th March 2012, 08:18 AM   #123
Turbon is offline Turbon  Sweden
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Thanks tcpoint and TheGimp!

I checked your proposals but sorry to say they are poorly soldered which I will correct but functioning. I measured the otputs from the regs and reg 5 showed a short. After a while I found 2 shorts. The first one was some copper debris on the solder side under the ALPS potentiometer. The second one was my own doing... Pin 27 (DSD) and 28 3,3V was shorted. I tried it with HW settings so DSD was jumpered to GND so pin 5 of the reg 5 was grounded this way. Well, that reg was destroyed if not by the short then indeed by the quest of finding the short - it lost pin 5 in the process. It will now take about a week to get a new one... As a test - could I temporarily use one of the other 3,3V regs?

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Old 20th March 2012, 12:44 PM   #124
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I'm slowly getting mine built. So far I have all resistors, filters, MLC caps, V-regs, ref, small logic and am working on electrolytics.

I plan to add the connectors, then test the power supplies before adding the remaining ICs.

I'm still missing a couple of connectors and caps.
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Old 20th March 2012, 08:41 PM   #125
TheGimp is offline TheGimp  United States
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What is nominal current draw when idle? Anyone measure it yet?

tks.

I went ahead and used the caps I had, substituting low esr 105C caps for the Silmic and Oscon caps. I'll order them and change them later after I've gotten used to this configuration to see how much difference they make.

Unit powers up and current draw levels off at 133mA when I hit 6.5V in.

Nothing smokes, LED 3 comes on (not real bright but certainly on). LEDS 1 & 2 are off unless I put my finger on the ICs to check for hot spots. Then LED 1 flickers.

Voltage regulators are all within spec.

Current draw at 7V in is 135mA.

Next I guess I need to get the IR receiver, Remote, and get the Arduino working.

The only test signal source I have is going to be the digital output of a computer CDrom drive till I get my ShigaClone working.

Hopefully I have a drive that I can use.

I'll post pictures later this evening.

Last edited by TheGimp; 20th March 2012 at 09:00 PM. Reason: Board powered up.
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Old 21st March 2012, 03:41 PM   #126
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Hello,

is there anybody of you can tell me whether the WM8741 can swap it's digital filter settings during operation in hardware mode? I would like hear the difference between the settings but not shure it is works.
The oversampling function is also an issue for me.

Another question. The tri state "high impendance" position is how much sensitive? If I left it long enough does not it operates like an antenna collecting false signals. Maybe if the on the fly settings are OK then a 100nF ceramic cap + ferrite bead or whatever similar can solve the problem.
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Old 24th March 2012, 11:06 PM   #127
Turbon is offline Turbon  Sweden
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Hmmm, I got mine working sort of but only if I keep my finger on IC8 pin5 and the RST/UL pin which is for connecting the small boards... For now I will only use it for USB so I need to find what values theese pins should be set to for it to work (without the finger :-) )

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Old 25th March 2012, 10:59 AM   #128
Turbon is offline Turbon  Sweden
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Quote:
Originally Posted by Turbon View Post
Hmmm, I got mine working sort of but only if I keep my finger on IC8 pin5 and the RST/UL pin which is for connecting the small boards... For now I will only use it for USB so I need to find what values theese pins should be set to for it to work (without the finger :-) )

Brgds
Problem solved, I believe this is your flickering problem as well TheGimp...

High Performance WM8741 Upsampling DAC New Version - Group buy

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Old 25th March 2012, 12:15 PM   #129
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It works without the 10K resistor together with the DIR9001 board.

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Old 25th March 2012, 05:04 PM   #130
Turbon is offline Turbon  Sweden
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Default Shame on me...

I forgot the RST circuit...

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