I knew you were joking and was just as surprised as you to see there is one.
Funny thing is it looks like a smaller version of the HIFI ARDUINO blog which has been the manual for me, certainly for the basics and much of what goes on beyond.
THEN there is moreDAMfilters for those who want to go further.
Nonetheless, I am glad there is one thing less to be complained about with SOEKRIS having a manual on the site.
Did you mean to type WOOLLY? AND you are being as obtuse about your Vref capacitance as those you take to task for not being specific for theirs! 3000uF for all four sections or for each section? I agree with you taking them to task because I wonder, too.
Funny thing is it looks like a smaller version of the HIFI ARDUINO blog which has been the manual for me, certainly for the basics and much of what goes on beyond.
THEN there is moreDAMfilters for those who want to go further.
Nonetheless, I am glad there is one thing less to be complained about with SOEKRIS having a manual on the site.
Did you mean to type WOOLLY? AND you are being as obtuse about your Vref capacitance as those you take to task for not being specific for theirs! 3000uF for all four sections or for each section? I agree with you taking them to task because I wonder, too.
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Also:
http://www.distrelec.it/Web/Downloads/g_/ds/pmlcap_eng_ds.pdf?mime=application/pdf
But it's 1812, too:
Acquista Condensatori polimerici 10 uF 16 VDC, Rubycon, 16ST106MC44532 | Distrelec Italia
4.7uF is 'only' 1210, can be stacked on top of each other?
http://www.distrelec.it/Web/Downloads/g_/ds/pmlcap_eng_ds.pdf?mime=application/pdf
But it's 1812, too:
Acquista Condensatori polimerici 10 uF 16 VDC, Rubycon, 16ST106MC44532 | Distrelec Italia
4.7uF is 'only' 1210, can be stacked on top of each other?
To be clear.
Here is my cap mod.
http://www.diyaudio.com/forums/vend...magnitude-24-bit-384-khz-372.html#post4469046
Each cap is 1000uf . 4*1000uf each rail.
But I got a pm from a great guy. One suggestion was reducing the value of the series resistor. I did only have approx 170mohm there. I parallelled it with another 180mohm. => 90mohm.
I also removed C135 and C142 just for the fun of it.
Things became alot better.
Need to order some more resistors. (0.01ohm as I dont have these on hand. ) and 499r as suggested at moreDAMfilters. Do some testing afterwards.
At least it seems as the value of the series resistor make a quite a big role in the SQ of the dam (maybe especially with added capacitance).
Here is my cap mod.
http://www.diyaudio.com/forums/vend...magnitude-24-bit-384-khz-372.html#post4469046
Each cap is 1000uf . 4*1000uf each rail.
But I got a pm from a great guy. One suggestion was reducing the value of the series resistor. I did only have approx 170mohm there. I parallelled it with another 180mohm. => 90mohm.
I also removed C135 and C142 just for the fun of it.
Things became alot better.
Need to order some more resistors. (0.01ohm as I dont have these on hand. ) and 499r as suggested at moreDAMfilters. Do some testing afterwards.
At least it seems as the value of the series resistor make a quite a big role in the SQ of the dam (maybe especially with added capacitance).
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Good thing about rev.2 board is that I don't have to solder all those VREF caps and 0.01R mods.
Good for you, with the current value of CA$, I'll hold off on 2nd board
I, too, had considered resistor wire for the 0.01R but the fellow who is doing the resistor work told me it would be harder, at least for him.
Maybe if you could find a ribbon wire version you could get it to stay in place but a round wire is going to be extremely difficult to keep in place.
Sorry guys, I never said it was 0603 (those green marks are only pointers where ceramic are missing). Any one who already done trough hole big capacitors mod can do it. Before you cut them out just place SMD 10uF film capacitor on both wires coming down from board, and solder it. Now you can cut off big electrolytes.
Of course with good SMD tools (SMA adhesive really helps) and skills one can solder 1812 on that footprint by
placing cap vertically (there is 4.5mm x 2.6mm space).
Cheers
Danny
Attachments
Nice test.
I definitely prefer the second, looks more like a nice declining FFT of a triode
Time to finish my autoformer and do the volume controml with that.
The shape of the harmonics is not in the first place due the shunt resistor for volume reduction. It is the shape of the/my DAM harmonics at -1dB scaled more or less down. The shape of harmonics is due to the resistor tolerances and probably different for the individual DAMs.
Only as the MSB resistors are of higher grade, it is to be expected that you get a somehow nicer shape that way.
Sorry guys, I never said it was 0603 (those green marks are only pointers where ceramic are missing). Any one who already done trough hole big capacitors mod can do it. Before you cut them out just place SMD 10uF film capacitor on both wires coming down from board, and solder it. Now you can cut off big electrolytes.
Of course with good SMD tools (SMA adhesive really helps) and skills one can solder 1812 on that footprint by
placing cap vertically (there is 4.5mm x 2.6mm space).
Cheers
Danny
OK - so which caps did you use?
//
There's a very good post of Paul@moredamfilters that gives an explanation of the woolly bass that some have.
I's not just the caps, it's the combination of the three resistors(series, feedback, compensation) and the amount of caps.
I's not just the caps, it's the combination of the three resistors(series, feedback, compensation) and the amount of caps.
Some I had on hand (got it from e-bay for another project, lucky didn't used it).
One thing to clarify for some of you :Rail is two voltage lines (+4v and Gnd;or -4v and Gnd) so 60uF per one rail (see attachment - yellow line).
Cheers
Danny
btw once my multi buffer mod is finished I may go replace them with SMD PLMA caps .......
Attachments
nige2000,
Have you looked at Paul's blog? I would think between there and HIFI ARDUINO you should get it. I would help but I am still out of commission waiting for my tech friend to install the latest recommended resistors.
I waited until I felt this was a settled issue so my board has been out of commission for over a month. More like two months, I suspect. Needless to say I have not installed the new firmware nor had a chance to select the new filters.
Paul has some filters for the new firmware, also. (moreDAMfilters)
AS you have read he has an excellent analysis of the various resistor and cap values.
As I gush sincerely to him: he is indispensable to the SOEKRIS project. Not to neglect what you found with powering the thing so long ago ...
Good to see your name again.
Have you looked at Paul's blog? I would think between there and HIFI ARDUINO you should get it. I would help but I am still out of commission waiting for my tech friend to install the latest recommended resistors.
I waited until I felt this was a settled issue so my board has been out of commission for over a month. More like two months, I suspect. Needless to say I have not installed the new firmware nor had a chance to select the new filters.
Paul has some filters for the new firmware, also. (moreDAMfilters)
AS you have read he has an excellent analysis of the various resistor and cap values.
As I gush sincerely to him: he is indispensable to the SOEKRIS project. Not to neglect what you found with powering the thing so long ago ...
Good to see your name again.