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2SDF – PANASONIC – IC Chips – Kynix Semiconductor

Leave the transistors alone. I agree with cetoole. I posted a thread on this a little while back which included a board layout picture. I seem to remember Garbz posted pictures of his Pass D1 variant on here; I forget if he had board images though. Post 9 of I will post some pictures of the board. Thanks for the help. I would like to try better transistors.

No, create an account now. Need help for transistors upgrade. Headphone Reviews and Discussion – Head-Fi. Post 4 of Thanks for the tips.

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2SD1944 Datasheet PDF

Post 11 of May 28, at 6: To your original question: May 9, at 3: After bypassing the electrolytics in the power supply and adding darasheet to the chassis I tackled the analog stage. The PCB set is 18 Euro, and he can supply parts as well.

Hope will raise sound quality.

Sometimes I can hear noise when the player is searching for a track, but the increase in sound quality is worth it. I would definitely recommend getting a schematic if possible before just shotgunning parts 22sd1944. May 29, at 3: Supposed to be really good and cheap Post 5 of I performed a similar mod on a Sony DVD player.

May 11, at 9: May 29, at 8: This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Post 10 of Is there somewhere where we can buy PCBs of discrete analog stages?

What I did was to change out the opamp and replaced it with an OPA It would be pretty simple to increase bias some so as to drop the input impedance further.

NTE56 – NPN Transistor, SI High-Gain Switch

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. I class-a biased it with two jfets. Your username or email address: Unfortunately, I can not find the schema.

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May 30, dafasheet Too expensive mod compared to the DAC performance, unless there are some great and cheap good analog stages. I really would suggest leaving the transistors alone, especially since you dont have any idea what they do in this circuit.

(PDF) 2SD1944 Datasheet download

I would guess at least some of them are for output muting. The ones closest to the opamps look like they are the muting transistors. Current or voltage output?

May 11, at 2: You’ll see the signal from the opamp output will go thru a cap and a resistor or two followed by the muting transistors. 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.