[DrSheep]

  Somebody, have you replace someone headphone amplifier (AD8397) ?

You can't do that, as it was soldered on board.

 

[Yamada-Tech]

  You can't do that, as it was soldered on board.

Yeah! I know
I try it soon (AD8397 to LT1469-2)

 

[audionewbi]

It's possible to replace it, needs the know how.

 

[Yamada-Tech]

AD8397 is here.
8-SOP type
 
AD8397 spec
Dual operational amplifier
Voltage feedback
Wide supply range from 3 V to 24 V
Rail-to-rail output
Output swing to within 0.5 V of supply rails High linear output current 310 mA peak into 32 Ω on ±12 V supplies while maintaining −80 dBc SFDR
Low noise
4.5 nV/√Hz voltage noise density at 100 kHz
1.5 pA/√Hz current noise density at 100 kHz
High speed
69 MHz bandwidth (G = 1, −3 dB)
53 V/μs slew rate (RLOAD = 25 Ω)
 

 

[Yamada-Tech]

I did it !


 
LT1469CS8-2 spec
 
Dual operational amplifier
Voltage 3V - 18V
Vos:30uV
Ios:13nA
Inv:300nVp-p
GBW:200MHz
SR:30V/us
Is:7mA(Max)
 
but after I changed it, 2.5mm out is very very noisy(Biggest white noise?)
3.5mm out is very clear... I don't know the cause.
 
I try once more lator.

 

[DrSheep]

Holy crap...

 

[yanvan]

  FYI, my review is up on Head-Pie: http://headpie.blogspot.com/2016/01/venturecraft-soundroid-valoq-sdp-1.html
 
Not much you all don't know already, but I hope it will be a decent read for someone new to this DAP.

Thanks for your review.
I decided to buy this DAP 
I happened to know that you had a Chinese version menu for sdp-1, could you send it to me 
Thanks

 

[DrSheep]

Done.

 

[qsk78]

Guys, have you fixed that "white strap" issue with your VALOQ? Any information from VC on this?

 

[DrSheep]

  Guys, have you fixed that "white strap" issue with your VALOQ? Any information from VC on this?

Not yet, but I RMA mine back.

 

[ajchen]

FYI ,  I just replaced OP in Valoq from  Muses01 to LME49990MA*4 (Due to LME49900MA is single OP , so we need 2*2 in Valoq) . It gave me less hissing than Muses series and more natural sound . I would say it's worthy to try .

 

[DrSheep]

  FYI ,  I just replaced OP in Valoq from  Muses01 to LME49990MA*4 (Due to LME49900MA is single OP , so we need 2*2 in Valoq) . It gave me less hissing than Muses series and more natural sound . I would say it's worthy to try .

I agree, as I have the same experience with the LME49860NA.

 

[ajchen]

  I agree, as I have the same experience with the LME49860NA.

Yes , Doctor ! I tried to follow your advice but LME49860NA is hard to find here   ; at least LME49990MA makes me happy without hissing now

 

[DrSheep]

 
Yes , Doctor ! I tried to follow your advice but LME49860NA is hard to find here   ; at least LME49990MA makes me happy without hissing now

??  Just go to Mouser.com and they ship world wide.  But I am glad you liked it too.

 

[ajchen]

 
??  Just go to Mouser.com and they ship world wide.  But I am glad you liked it too.

http://goo.gl/ziGH8g  << they ask me to buy at least 200 pcs .............