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Too expensive mod compared to the DAC performance, unless there are some great and cheap good analog stages. May 30, at I will post some pictures of the board.

No, create an account now. The original parts are: Unfortunately, I can not find the schema.

ROHM 2SD datasheet, 2SD is NPN transistor, 60V, 3A

Sometimes I can hear noise when the player is searching for a track, but the increase in sound quality is worth it. May 29, at 5: Then I took the output straight off the opamp, thru two huge solen caps, straight to the output jacks, effectively bypassing the stock caps, resistors, and muting transistors.

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Post 3 of It would be pretty simple to increase bias some so as to drop the input impedance further. Which parts would improve quality? The ones closest to the opamps look like they are the muting transistors. Also, the Pass D1 stage is another one to look at.

Is there somewhere where we can buy PCBs of discrete analog stages? May 9, at 3: Leave the transistors alone. I really would suggest leaving 2sd19444 transistors alone, especially since you dont have any idea what they do in this circuit. May 28, at 6: Post 7 of By continuing to use this site, you are consenting to our use of cookies. This isnt for the schematic I am currently working on, but should be pretty good. Need help datashset transistors upgrade.

D1944 Datasheet PDF – Rohm

Headphone Reviews and Discussion – Head-Fi. Post 14 of I would guess at least some of them are for output muting. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.


I would definitely recommend getting a schematic if possible before just shotgunning parts out. I would like to try better transistors. I performed a similar mod on a Sony DVD player. Post 15 of Colin cetoole looked the design over and saw some things he didn’t like. Are there some transistors replacement databases on the web?

If you can etch your own board, or use protoboard, you could build some of the stages pretty easily. Post 13 of There are improved variations on this, as it was really just posted to get people thinking, but this is probably the simplest it will get while still offering good performance. Can somebody give me a hand?