FET Audio | Hi-End Audio & Electronics DIY Electronics & Repair

Version 2 is available NOW!  Added features on circuit diagram.  The converter board is also usable for most OLD DAC using CS8412 receiver chip!!!

WM8804 to CS8412 Version 2 Converter board details: WM8804 to CS8412 V2 Converter Board Technical Details Rev2 (updated on 13 Feb 2020)

Below is V1 details.

I have sold hundreds of D1V3 & D1V33 few years ago but I have not forgot continue support for this classical DAC using the best R2R PCM63 DAC chips and Jfet IV common gate topology.  There is a new life to the old classic DAC if you upgrade the receiver from CS8412, CS8414, or DIR9001 to WM8804 which many diyers as well as hi-end audio professionals are all agreed to its best sound performance.  I believe it is the best news for all D1V3 and D1V33 users as well as other DAC users because this converter board can output 4 digital modes and thus it can meet most DAC technical needs.

Please take note that there is a chance that this converter may not work perfectly or even not working in other DAC platform as there is no 100% compatibility due to different chips in different time of history.  But as usual, I shall advise my best guess after reviewing the DAC circuit before you buy and provide remote trouble shoot support as usual.  

Technical details: WM8804 to CS8412 Converter Board Technical Details 3

8804_8412 circuit diagram

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See Store page for NEW PRICES.  http://www.fetaudio.com/store

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This FDA-1B PCM1794A DAC is an upgraded version of the obsolete FDA-1 Single Ended DAC.  FDA-1B has been developing for 1.5 years since FDA-1 was selling. More than 7 version PCBs have been tested before launching to DIYers. It has improved all the weaknesses of FDA-1 and added additional features and functions to enhance the sonic performance and flexibility of the design. Thus it is a more complete and mature design with separate Front Panel control board, I2S input via RJ45 socket and optional ASRC function via daughter board plug-in!

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Since it is a DIY DAC and thus most of the parts are selected to be through-hole parts except the ICs and some film capacitors.  In fact most of the film capacitors pad are designed with both SMT (Surface Mount Technology) and TH (Through Hole) pads/holes and thus user can make a change in case better parts is available on hand.  In the I/V section, all TH resistors and some filter capacitors are also provided with a SMT pads in case people want to try the SMT parts.  For the digital section TH resistor pads can also be soldered with a 0805 SMT resistor due to its pitch is 2.54mm. Thus this PCB design is really remarkable and flexible for DIYers to experiment with different types of part for sound tuning!

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For the Front Panel control board, it is mainly SMT parts with TH for LEDs and sockets.  Thus it provides a good basic training for all DIYers for SMT soldering.  In fact, SMT parts (with size 0603 and above) are easier and faster to hand solder than TH parts after managing the skills.  What you need is just a 5x magnify glass with stand, small head tweezers, 0.4mm to 0.5mm diameter solder wire and your two stable hands.

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New update manual Rev 2: FDA-1B DAC Manual_r2a

This file help to locate all difficult to find resistors, capacitors and diodes: 15c-Part_Location

Go to Store page if you want to buy this kit.

Here is some photos of the FDA-1B DAC kit.

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Note that ONE type of I2S input daughter board with RJ45 socket will be provided free.  There are 3 type RJ45 pin assignment boards that can be selected during order – Fetaudio, Kingrex and M2Tech.

The pin assignment can be found in attached document:

RX7-silk1

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