Joachim Gerhard Filter Buffer for ES9022 - Page 49 - diyAudio
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Old 12th February 2013, 01:05 AM   #481
EUVL is offline EUVL  Europe
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Fran,

If you would forgive me I want to say I like your previous woodwork.
It was spceial, elegenant, and minimalisitic, in the spirit of XEN.



But as Joachim said, sounding good id ultimately what matters.


Patrick
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Old 12th February 2013, 07:49 AM   #482
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I liked it too - and I don't much enjoy making chassis! But once there are mains voltages involved an open frame isn't good enough. Small fingers....


Ah I'll use it for something else...


Fran
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Old 12th February 2013, 08:37 PM   #483
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Quote:
Originally Posted by VT67 View Post
I also have one of those lying around. Does that regulator really need such a big heatsink?

Regards
Which regulator are you using?
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Old 13th February 2013, 12:37 AM   #484
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Coffin used to offer these. They seem to have a new website here.
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Old 16th February 2013, 10:07 PM   #485
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18mH coil DCR seems higher on this but it shows stock and would be priced well, CAN it be used in this circuit?

AIUR-04-183J-ND Digikey
AIUR-04-183J Abracon Corporation | AIUR-04-183J-ND | DigiKey

60 ohm max DCR is WAY higher than the stock on in this design
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Old 16th February 2013, 10:35 PM   #486
EUVL is offline EUVL  Europe
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It is inferior to the Fastron P09 as proposed here, which in turn is also inferior to the 07MFG we specified :
Fastron Inductor Group Buy for JG Filter Buffer

> Can it be used ?
There is only one way to find out -- just try.


Patrick
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Old 17th February 2013, 12:14 AM   #487
EUVL is offline EUVL  Europe
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Here a screenshot of the data summary of the 07MFG 18mH as listed by Mouser.
The SRF is at 525kHZ, almost double that of the others.


Patrick
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File Type: png Fastron 07MFG 18mH SRF.png (26.8 KB, 335 views)
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Old 17th February 2013, 02:40 AM   #488
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Default SRF

Quote:
Originally Posted by EUVL View Post
Here a screenshot of the data summary of the 07MFG 18mH as listed by Mouser.
The SRF is at 525kHZ, almost double that of the others.


Patrick
So SRF is pretty important. The below would also then be ? too far below spec? I could change out the coils in Summer. BUT if they will cause distortion... maybe I just wait. I can try a few...they would ship in just days, but I'm not ready with a board.

I would volunteer to sort and ship the proper coils for the USA, but it seems like 14 weeks to possibly get some. I have a great LCR meter.
I'll have Curryman's boards for USA folks too [they are handy for me even without the buffer you see...a good es9023 board with regulators and 50Mhz oscillator]. Happy to make this easier for folks this side of the pond -- good coils seem rare.


RL181S-183J-RC


Inductance: 18 mH Tolerance: 5 % Maximum DC Current: 21 mA Maximum DC Resistance: 17 Ohms Operating Temperature Range: - 55 C to + 105 C Self Resonant Frequency: 0.19 MHz Q Minimum: 100

Last edited by enjoybiking; 17th February 2013 at 02:56 AM. Reason: ooopz
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Old 17th February 2013, 03:47 AM   #489
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Default SRF and what CAN we get?

Quote:
Originally Posted by EUVL View Post
Here a screenshot of the data summary of the 07MFG 18mH as listed by Mouser.
The SRF is at 525kHZ, almost double that of the others.
Patrick
I think of my deceased Father, in the 50s he ran a small town grocery store. Later when I was alive we'd go shopping, he'd have the newspaper ads along... and gripe "eggs are $0.38/dozen {USD} but they don't HAVE ANY".

I'll help with this situation but I can't buy 500 or 1 {the coils}. I have not tried direct contact with the maker [some of you probably HAVE].

I gather the 18MH coil forms a LPF at a very high Z-input to the FETs. I am not an ENGR. I cannot "see" if the buffer is unity or has gain, and I apologize for not reading the entire thread. I gather that SRF...could it have sub_harmonics? Not sure the issue with SRF. I think I understand low DCR always nice. Series R of the coil wire changes slopes? My mind thinks Acoustic Reality Crossover tweeter coil.

I will be sourcing Daniel's Es9023//JG buffer board to USA, to help the DIY cause{SO fun}, they will not cost much. I ordered them to have I2s es9023 boards around for my own mods and builds, if I like the JG buffer, well, the artwork will be there thanks to Daniel and Joachim.

- The other Patrick
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Old 17th February 2013, 07:32 AM   #490
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The buffer is near unity gain. High self resonance of the coil helps to make the filter work
( drop aliasing products ) up to very high high frequencies where is not much energy any more. A low self resonance of the coil will change the slope of the filter. The coil looses inductance there, first there is a minumum ( actually an inductance maximum ) and then the coil gets capacitive so there is a rise in frequency. It simply does not work like a theoretically perfect coil any more over the resonance frequency.
First i had objections to use a ferrite coil but i testet the sound of the Faston compared to a very expensive Sowter coil and got a very satifying result. It sure does not sound hard or distorted. Quite the contrary, smooth and liquid and that was what i wanted.
I found the "untreated" ESS DAC a bit on the brittle side and that effect disapeared with my filter-buffer.

Last edited by Joachim Gerhard; 17th February 2013 at 07:34 AM.
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