Dac Audiophonics WM8741+ WM8805 modification !!

[mprivitera1]

Hello everyone,
I pcb DAC audiophonics dac8741 - dac/controleur de volume wm8805 + wm8741 in this subject, I'm going to improve the power supply section by replacing capacitors + diode rectifiers and replace capacitors on signal .It features a crystal oscillator XTAL osc NSK 12.0000 MKZ, do you even replacing this oscillator with another best will have benefits on sound? which put in place of it?

 

[mprivitera1]

ok, considering that the first question had no effect .... let's try another question;
this dac has an unbalanced and a balanced output .I only use the unbalanced output, if I wanted to replace the OPA (four) present, I have to replace all four or just replace the two near unbalanced output?

 

[Extreme_Boky]

A1 NDK
A2 all 4

 

[mprivitera1]

A1 NDK
A2 all 4

Thanks for response .
I understand it ;
A1 NDK > balanced output only 2 opa replace ?
A2 at 4 > unbalanced output replace all 4 OPA ?

 

[Extreme_Boky]

Answer to question 1: use NDK oscillators
Answer to question 2: you must replace all 4 OPA's

Nick

 

[mprivitera1]

Answer to question 1: use NDK oscillators
Answer to question 2: you must replace all 4 OPA's

Nick

ok ... now everything is clear !!

Thanks

 

[mprivitera1]

Hello guys ,
other questions DAC ;

it has a ;

Dip Switch :
SW1 : Anti clipping ( de 0 à - 2dB ) en entrée
SW2 : The brightness of the bill-poster ( min / max )
SW3 : upsampling 128x / 256x
SW4 : not utilisé

What is the SW1 and SW3 ?

another question ; do you think that output impedance ?

Thank you🙂