Patick, when i make a PSU should i supply all modules from the same source or should the suppy being split ?
The 4 supplies are :
WM8804 SPDIF receiver Phase Lock Loop
WM8804 SPDIF receiver Digital circuitry
48MHz Crystek XO
ES9022 DAC
Each should be dimensioned at min. 7V 50mA. One can probably get away with less, but IMHO no point to be so tight with PSU margins.
I have tried supplying all 4 with one supply +12V, with CLCRC between each of the 4 on PCB to the 12V mains.
Gnd is connected at a single point on the ES9022 board close to the connector to WM8804.
It does work, and how much sound quality deterioration is a matter of subjective view.
In any case we shall be mixing digital circuits running at different frequencies with analog circuits.
And the digital circuits will suffer from some Gnd bounce due to Gnd point being further away.
For my own use, I stick to 4x NiMH batteries.
Patrick
WM8804 SPDIF receiver Phase Lock Loop
WM8804 SPDIF receiver Digital circuitry
48MHz Crystek XO
ES9022 DAC
Each should be dimensioned at min. 7V 50mA. One can probably get away with less, but IMHO no point to be so tight with PSU margins.
I have tried supplying all 4 with one supply +12V, with CLCRC between each of the 4 on PCB to the 12V mains.
Gnd is connected at a single point on the ES9022 board close to the connector to WM8804.
It does work, and how much sound quality deterioration is a matter of subjective view.
In any case we shall be mixing digital circuits running at different frequencies with analog circuits.
And the digital circuits will suffer from some Gnd bounce due to Gnd point being further away.
For my own use, I stick to 4x NiMH batteries.
Patrick
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Of course a hobby can wait.
It is heartening to read when someone has life's priorities in proper alignment.
Your team member is in my prayers.
I'm still running mine directly from 4 LiFePO4 batteries (bypassing the regulators). Very clean sound with fantastic detail retrieval. I'm wondering what the output stage would bring to the DAC. Sometimes I do wonder if its a tad lean, but thats not my overall impression. Certainly this chip is a fantastic performer.
Fran
Fran
I got a fuller, less clinical and more dynamic sound with the filter-buffer. It sounded very good without any modifiaction anyway. Talking the very compact build into acount this is a little miracle.
> Sometimes I do wonder if its a tad lean
That depends on how wide band (revealing) the rest of your chain is.
But we ourselves are also eager to try the filter.
The Sallen Key filter buffer we tried does bring improvements to "smoothness".
Patrick
That depends on how wide band (revealing) the rest of your chain is.
But we ourselves are also eager to try the filter.
The Sallen Key filter buffer we tried does bring improvements to "smoothness".
Patrick
Hi Joachim and Patrick!
I'm planning to build a buffer. Initially I was of course looking at the Pass B1 but now I'm rather looking at the buffer you propose in this thread. I have some minor questions before I build it though, hopefully you have the possibility to answer them.
1) I understand the filter is there specifically for the Ess DAC. I don't need the filter and so will not use it. What should I use instead, would a resistance to ground be enough (I will be using a "Warpspeed" optocoupler in front of the buffer)? If so, what value?
2) The amp used after the buffer has quite a low input impedance, so the buffer's output impedance should not exceed say 500 ohm. Do you know what output impedance the buffer has?
Best from Stockholm!
Johan 🙂
I'm planning to build a buffer. Initially I was of course looking at the Pass B1 but now I'm rather looking at the buffer you propose in this thread. I have some minor questions before I build it though, hopefully you have the possibility to answer them.
1) I understand the filter is there specifically for the Ess DAC. I don't need the filter and so will not use it. What should I use instead, would a resistance to ground be enough (I will be using a "Warpspeed" optocoupler in front of the buffer)? If so, what value?
2) The amp used after the buffer has quite a low input impedance, so the buffer's output impedance should not exceed say 500 ohm. Do you know what output impedance the buffer has?
Best from Stockholm!
Johan 🙂
The filter is quiet soft and has a good time domain behaviour. It is not specially made for the ESS but EUVL´s bord has a cap on board that i took into considaration.
The buffer is very low impedance, less the 50 Ohm.
The limit is the current it can deliver in class a. That is around 8mA, the Idss of the fet.
It can drive 8V class a into 1kOhm.
The buffer is very low impedance, less the 50 Ohm.
The limit is the current it can deliver in class a. That is around 8mA, the Idss of the fet.
It can drive 8V class a into 1kOhm.
Many thanks Joachim! I'll have a look at EUVL's board to see what value the cap has. I think I will go for this buffer!
Best,
Johan 🙂
Best,
Johan 🙂
Dear Friends,
Woul be glad if there is a group buy for the chip it self, since it hard to find the chip in my country (indonesia). i've contact the nearest distributor in singapore and they said that minimum purchase for the es9022 (es9023 is EOL) is 300 pcs, and they can give technical support (data sheet) for only 20K pcs chip order.
i emailed bryans of shawelectronik but no reply until now for the international buyer, and ysmosis ask 200usd for the shipping cost.
Well, any help would be highly appreciated
Regards
denis
Woul be glad if there is a group buy for the chip it self, since it hard to find the chip in my country (indonesia). i've contact the nearest distributor in singapore and they said that minimum purchase for the es9022 (es9023 is EOL) is 300 pcs, and they can give technical support (data sheet) for only 20K pcs chip order.
i emailed bryans of shawelectronik but no reply until now for the international buyer, and ysmosis ask 200usd for the shipping cost.
Well, any help would be highly appreciated
Regards
denis
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