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DAC End 2

Posted 29th March 2010 at 01:33 AM by quanghao
Updated 29th March 2010 at 02:16 AM by quanghao


After the good result obtain with the DAC End I have design with Nguyen Quang Hao a set of boards to create a cheaper project with a sonic performances very near.

The No Oversampling DAC give a more natural sound but if you ear the TDA1541 and TDA1543 seem to lose details.

The AD1865N-K with passive I/V give a perfect combination, natural sound and all the details.

The AD1865N-K give the better performances with a 200ohm MK132 Caddock as passive I/V.

In this configuration the output signal is too low to drive any amplifier so I have design for the AD1865N-K the better output stage.

This DAC use a single ended vacuum tube amplifier without the expensive output transformers used in my original DAC End.

The DAC board follows the original design but has been inserted a jump to switch the phase of output signal.

In any vacuum tube stage the signal on the anode is in out phase with the grid signal so the jump is necessary to get a correct in phase output.

After some test has been decided to use shunt regulator to increase the sonic performances so a Salas regulator has been used for the DAC section.

Quang Hao have created a group buy on diyAudio to reduce the production cost of these pcb.

Any board have the same size 12.5 x 9.5 and all 19 x 25.

All these pcb boards has been created only for DIY so no commercial use is allowed.



* Crystal CS8414 used like receivers to obtain LSB signals from spdif input
* Analog Device AD1865
* 74HC04 Hex Inverter used to create the latch signal for the right channel
* E182CC Mullard or 5687 Jan Philips
* LM311
* BC337
* IRFP240
* IRPF9240
* TL431
* 2SK170
* BC550
* BC560
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Total Comments 1


  1. Old Comment
    Can we buy just pcbs?
    Posted 24th October 2012 at 02:10 PM by

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