[DBaldock9]

Great idea and well implemented!

Thanks!
I used 18 gauge solid copper wire, so it was a bit tricky getting them routed to the correct lugs.
Looking back through this thread, you'll see where the pin-out for the original Hirose 6-pin connector is shown.
So, that allowed me to determine which circuit board pads are which signals.
I used Kapton tape over the two pads (#1 & #4), for Right & Left channel GND, since the earphones only need the (L+), (L-), (R+), & (R-) signals.
Since it's deeper than the Hirose jack, the back edge of the 2.5mm jack did require some filing, so that it would clear the circuit board.

 

[Lohb]

Anyone know if BUF634P WB were produced specially for PB2, no luck digging them up so far..

 

[DBaldock9]

Anyone know if BUF634P WB were produced specially for PB2, no luck digging them up so far..

Looks like someone on eBay has the "P" model - https://www.ebay.com/itm/1pcs-BUF634P-250mA-HIGH-SPEED-BUFFER-BUF634-DIP-8-pin-/202519434139

 

[Lohb]

ADA4627 = great little chips...like an LME49990 with that transparency/separation/microdetail ...but more natural tonality and fuller 'body' to the presentation.
$38 on bay from Taiwan....
eBay item number: 283459781418
Never heard of them before, but were already in an amp I just grabbed as an upgrade option over stock OPA134.

 

[Rizonsik]

How you are connecting DB2 to the source? USB or coaxial(optical)?
Check the voltage on the DACs (AVDD and DVDD).
And be sure to unsolder pin 22 on both DACs and conected it to the pin 23.

Hello! I want modding my db2... Please, tell me where is this pin 22 and 23 or post screenshot modification. And where you soldering usb to I2S too. Thank you!

 

[plutonim]

Hello! I want modding my db2... Please, tell me where is this pin 22 and 23 or post screenshot modification. And where you soldering usb to I2S too. Thank you!

 

[Rizonsik]

With Both chip i guess? Maybe I'll leave it as it is Love warm sound :3 And darkest too! Have you tried role db2 opamp? With blue it sounds wider and YAMY :3 Whats opamp in your db2? Thank you for the fast replay!

 

[Lohb]

I have the Energizer battery and LPS dongles for PB2 below if anyone is interested...has 12-Volt for sure and maybe 15-volt LPS is around.
https://www.head-fi.org/threads/ene...pella-or-beresford-dacs-or-ibasso-pb2.915680/

 

[plutonim]

With Both chip i guess?

Yes, of course

Whats opamp in your db2?

ADA4897-1, but the muses8832 was very nice too

 

[Rizonsik]

ADA4897-1, but the muses8832 was very nice too

OK. I try ADA4897-1 becase price is very nice! Thanks!

 

[Lohb]

OK. I try ADA4897-1 becase price is very nice! Thanks!

I found my fav. mass market opamp to be ADA4627B over LME49990 which it took top position from.

 

[Rizonsik]

Can anyone come across... At me, why that if to connect with dyummy buffer, LME49990 from a network crack. With normal buffer all works fine. I dont have battery to test with it.

 

[Rizonsik]

Can anyone know where I can buy the original LME49990? I think I have noname opamp...

 

[Lohb]

Can anyone know where I can buy the original LME49990? I think I have noname opamp...

There was a seller in Taiwan on ebay.com that offered various grades of solder with that chip..his ones were real.
OPA1622 is supposed to be the nearest replacement for LME49990. Cheaper.

 

[Rizonsik]

I listened to lme49990, I really like them! If only it hadn't been for that crack... With the blue Buffer, the crackling is not audible. But, I'd like to listen with a dummy buffer! Can who knows, how much cost original lme49990?