S.houBed DAC 132db Dual MONO pcm1794 - Page 2 - diyAudio
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Old 11th November 2012, 10:53 AM   #11
Aiace is offline Aiace  Italy
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Quote:
Originally Posted by qusp View Post
all good, I just think its unnecessary. not suggesting you will get rich from this, just that it would be better if you didnt print false specifications on the PCB and on the thread title when you obviously dont know its actual performance.
The message was clear the first time you wrote it. Please let him describe more accurately his project and don't polemize on silly details.
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Old 14th November 2012, 03:41 PM   #12
xslavic is offline xslavic  Moldova
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another thing would be to aproximate the 51R resistor to be closer to the Out impedance of the opamp
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Old 14th November 2012, 06:00 PM   #13
qusp is offline qusp  Australia
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Quote:
you meassure yourself,i choosed the best in it and will try to improve it,i dont tend to get rich from this.
when someone makes a comment like this, its not clear to me the motivation for what I said was understood by HIM, obviously you understood it. I didnt repeat/clarify it for you....

it does the design a disservice as well, since it wont happen to meet the number

Last edited by qusp; 14th November 2012 at 06:04 PM.
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Old 17th November 2012, 03:51 PM   #14
xslavic is offline xslavic  Moldova
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Default S.houbed DAC

Use lm7805 backwards in the place of the lm317 and connect it as in datasheet
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Old 17th November 2012, 04:15 PM   #15
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Yeah, even trying to accurately measure 132dB S/N requires some very expensive equipment, as far as I know.
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Old 18th November 2012, 02:23 PM   #16
xslavic is offline xslavic  Moldova
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Default New,out low pass S.houbed

Hi
new improvement
valid for Active filter opamp
Calculated for opa2134 cuttof at 25.3khz
increase Q factor very Much > 10 times
1.replacethe first 6.8k with 250R(4times amp or 12db gain) to 1k(No gain-double Q factor)
2.replace the rest of 6.8k with 1k
3.replace the 102k and 7k5 use only one 1k or two in parallel total 1k
4.filter capacitor 172pf(its the one on the opamp end from the 2 res in parallel)
5.replace 1n with 230nF
if need other opamps claculate here:
(Sample)Multiple Feedback Low-pass Filter Design Tool - Result -
for caps if one is 220pf the other one is 180n
AND finally 180pf and 220n (220p and 180n) -you get same 25291.38Hz
you can even make it floating thats 2x220n

Last edited by xslavic; 18th November 2012 at 02:35 PM.
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Old 18th November 2012, 09:19 PM   #17
xslavic is offline xslavic  Moldova
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Default error corrected s.houbed

the crystal had a bad connection
i guess i forgot to use it for the 4pin smd
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Old 19th November 2012, 02:46 PM   #18
xslavic is offline xslavic  Moldova
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Default error 24.576 crystal

please correct before installing
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Old 27th November 2012, 11:08 AM   #19
xslavic is offline xslavic  Moldova
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another solution for the single end LPF is to remove 110k and 7k5 and replace with only one 6k8 it will get you the same Q factor
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Old 30th November 2012, 08:45 AM   #20
xslavic is offline xslavic  Moldova
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IMPORTANT
One more thing First test without transistors installed
connect 390/195R out (feedback res) direct to 51R out,it should work this way to
51R equal to opamp output impedance so no more pops and clicks

Last edited by xslavic; 30th November 2012 at 08:47 AM. Reason: IMPORTANT
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