New PCM1794A Kit – Balanced Mode Update – Good to Fantastic Sound! - Page 22 - diyAudio
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Old 3rd January 2013, 12:54 AM   #211
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aha. i'm not going to use a control board. it will be internal DAC for my CDpro2 player.
so what i need to do is short pin 1 and 2 to ground?
right now it's playing with my squeezbox, and its sound wonderfull

Last edited by AudioSan; 3rd January 2013 at 12:56 AM.
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Old 5th January 2013, 03:30 PM   #212
beiji is offline beiji  France
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Hi,
I just have a fda 1B ( buy to a forumer for christmas) and i would like to know :

1) what is the function of the resistors 4R99 ( like R130) behind the analog out of the dac pcm1794 ?

2) I have a clock 11,286Mhz /5V from tentlabs. Can i use it with his own power supply and few modifications of the asrc card ? I want use the dac in a first time only with a cdpro at 44.1 khz.

3)Is that possible to have the schematics of the asrc board ?


bruno
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Old 5th January 2013, 11:19 PM   #213
spencer is offline spencer  Hong Kong
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The circuit of the ASRC BD is here:
http://www.fetaudio.com/wp-content/u...7-ASRC-Ckt.pdf
Regarding clock to the ASRC, it is a 24.576Mhz XO. Not sure if you can use 11.286Mhz or not.
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Old 6th January 2013, 10:39 AM   #214
beiji is offline beiji  France
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thanks for your answer.
Could you confirm to me i can sold ad1896 or src4192 on the pcb ? Or you have a pcb for each ?
( I have a pcb with ad1896 write on.)

bruno
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Old 6th January 2013, 02:52 PM   #215
spencer is offline spencer  Hong Kong
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The pcb is designed for AD1896. For SRC4192, there is no MCK out and thus the clock will be using the XO frequency. Thus the soldering is different.
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Old 6th January 2013, 08:41 PM   #216
beiji is offline beiji  France
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I'll try to sold together pin 2 and 3 of the src4192 and so, Mck Out will be the same of XO frequency and that would be working with your pcb.( I have one src4192 in my stock of parts but no ad1896)

and about the function of the resistor 4r99 at the entry of the I/V stage it's a secret ?
In a first time I have think this resistor is using for decrease the entry impedance of the stage i/v but on the MicroCap8 simulation, it's not the case.So I don't understand what is this function.
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Old 7th January 2013, 12:42 AM   #217
spencer is offline spencer  Hong Kong
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Regarding the output resistors to the IV, there is someone take some measurement and analysis on that in this forum. The findings is that driving a resistor IV up to 50 ohm to ground will not increase the distortion level much.
In my case, I find that putting the resistor in will ensure the distortion will be minimum at all situations. As you can see my design is not driving the output to a virtual ground but rather a positive reference set by the diodes. After doing that, the distortion is more consistent and low. Thus the resistor effect is minimized and become just a crossover of signal. I think if you are interested, you can change the value to see if you can hear any sound difference. I did not tried all possibility as it is a very time consuming process.
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Old 7th January 2013, 09:42 PM   #218
apoo is offline apoo  Germany
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Has somebody interest for buying my full assembled and working FDA-1B with both ASRC boards? External i2s prepared for WaveIO, Dale i/v resistors and russian PIO capacitors. No output capacitors. Eventually a Schuro encapsulated and ground-shielded toroidal transformer 230v-2x18v 65VA. Delivery from Germany. I´ve payed for all parts, inkl. transformer 560$ / 430€. Please PM me for offers!

apoo
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Old 8th January 2013, 01:31 PM   #219
apoo is offline apoo  Germany
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I´ve forgotten to say why i´m selling the FDA-1B. Well, I´ve noticed that i personally like more the sound of a NOS DAC.
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