NP D1 DAC clone with enhancement

[spencer]

Due to the complication of this DAC, 3 members have decided not to take the pcb. Thus there are 3 pcbs left for other members. Note that this pcb is not for non experienced diyers as it required some skills and understanding of electronics to complete it.

Let me know if you are keen.

[spencer]

One more gone, two pcb left.

[spencer]

I have matched some quads (4 pcs) 2SK170BL with Idss > 10mA for sales to those member that have brought my pcb. The Jfet is matched to within +/-0.1mA and are used in location Q3, Q8, Q13 and Q18.

[spencer]

All 20 pcs Ver2 board has been sold out. Thank you for your support.

[spencer]

Gone!

[spencer]

[spencer]

There are some people asking available of this kit details and here it is.

Latest upgade with DIR9001 receiver give better sound on sub sonic and clear back ground music with higher resolution. I shall provide details upgrade later soon.

[spencer]

Here is one photo with DIR9001 converter board.

[spencer]

In order to use DIR9001 converter board, two logic need to be change on two ICs.

1. HC86 pin 5 short to pin 7 (pin 5 from 5V short to ground). This is to ensure the de-emphasis function works.

2. SM5842 pin 5 short to pin 10 (pin 5 from ground to +5V). This is to set the input mode of 5842 to 16 bit.

Since the trace on the main board is under a IC socket and cannot easily be cut or jump a wire. I use another layer of IC pins shown and cut one of the pin 5 and then solder a jumper wire to the required pins on the same row of IC pins. This IC pins are first inserted into the original IC socket and then the IC inserted on top of it (show on another photo).

Thus this change can be back ward convertible back to the 8412 receiver without soldering on the main board.

[spencer]

Dont forget to set the DIR9001 to 16 bit output mode and also 256Fs. Here is photo of the final main board with all the changes.

Note that the HC86 and 5842 is sitting on two layer of socket pins.

For those interested to do the upgrade, I can provide a converter board later but please give me an email first so that I know how many people are interested. I can provide either bare board or complete assembly of converter board.

Cheers.