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Old 21st March 2012, 12:35 PM   #161
PJN is offline PJN  United States
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negative goes to the ground on the RCA outs.
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Old 21st March 2012, 04:37 PM   #162
poirson is offline poirson  France
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Hello

I did that but it isn't working ?

What's happened ?

Thanks
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Old 21st March 2012, 06:21 PM   #163
poirson is offline poirson  France
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Quote:
Originally Posted by poirson View Post
Hello

I did that but it isn't working ?

What's happened ?

Thanks
Sorry the pictures arrive.
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Old 21st March 2012, 07:08 PM   #164
poirson is offline poirson  France
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I tought the ground on the cs4398 and not on the rca, that's why.

So, very clear but a lot of hum in the 2441 and the 2405. A bit of compression too and distorsion.. I used intertechnik zn cap 1.5uF and russion pio 220nF in parallel.

What's the solution to reduce the noise first ? I'll see later if I keep this solution or no.

Bye
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Old 22nd March 2012, 12:32 PM   #165
PJN is offline PJN  United States
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Try hooking the grounds from the RCA outs to the ground on the board.
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Old 23rd March 2012, 02:49 AM   #166
i2k92 is offline i2k92  Indonesia
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@HIFIMEDIY : any news on WM8741 test ?
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Old 23rd March 2012, 06:51 AM   #167
poirson is offline poirson  France
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when I hook the rca ground on the main ground I don't have sound ?
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Old 23rd March 2012, 11:58 AM   #168
poirson is offline poirson  France
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On my amp (carver pm 1.5) I measured the ohmic value between xlr ground and earth ground : 27kohms.

The dac works when the rca ground isn't on the earth ground of it, so on the ground of the input amp's xlr.

May be shouldn't I use the earth ground on the dac ?

Thanks
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Old 29th March 2012, 01:42 AM   #169
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Originally Posted by i2k92 View Post
@HIFIMEDIY : any news on WM8741 test ?
I tested the wm8740 and found that a added LPF is needed . so I think we can't use it by now.
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Old 14th April 2012, 01:57 PM   #170
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Default new toy

I use socket for up-sampling, so you can use the module or some jumpers.
And a MCU is used. A sample board is ready to debug
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