PCM1798 ezDAC + Jfet IV + DIR9001

March 25th, 2008

This is a ezDAC pcb with two modifications: Use DIR9001 to replace CS8416 digital receiver and Jfet IV instead of op-amp IV.  This is a good DAC but the sonic lack of some musical taste.  It is a matter of preference but overall sound stage and 3D is good.

PCM1798 ezDAC circuit

X2 – Ver 3

February 13th, 2008

This is not a real Nelson Pass X2 as the output use transistors.  This is actually the ver 3 of Cheffdegaar in diyaudio post.

I do not like the sound and may be in future I shall build NP original X2 again.

UGS_V3a circuit

PCM1702 to PCM63 Converter BD

February 10th, 2008

This board is designed to use PCM1702 DAC chip (smd type) to replace PCM63 in D1V3.  There is one fault on the pad size of SOIC for PCM1702 (too wide).  Thus soldering of the DAC chip is quite difficult but the board is still able to be used.

Circuit

PMD100 to SM5842 Converter BD

January 10th, 2008

This is using PMD100 to replace SM5842 in D1Vx DAC.  The PMD100 can decode HDCD signal from CDs.

The input mode is right justified 16 bit and output is 20bit mode for PCM63.  All settings are hardwired and cannot be changed by jumpers!

Circuit

PMD100 pins asssignment

PMD100_BD Other Doc

Alesis AI-1 Sample converter

January 2nd, 2008

This is an old sample converter and digital selector for optical, SPDIF & AES formats.  The sample frequency can be selected for 44.1kHz or 48kHz.  Since this is old and you can get is as low as US$100 from ebay.

I use this to connect from my CD-PRO2 transport, SB3 or DAT as input and output to my D1V3, and other DAC or DAT.  This make my switching among equipment more easy.

Here are the photos: