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Old 5th November 2012, 07:13 PM   #221
pdul is offline pdul  Denmark
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the solderings look good, and whats the chance of making bad solderings in the same place, on two such big boards
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Old 5th November 2012, 07:15 PM   #222
pdul is offline pdul  Denmark
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With the opamps in, both measures the same
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Old 5th November 2012, 07:17 PM   #223
pdul is offline pdul  Denmark
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The sailing offset of +/- 100mv as if it were slowly sampling a sinus
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Old 5th November 2012, 07:34 PM   #224
pdul is offline pdul  Denmark
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We now have an ADconverter with a sampling frequency of 0,1 HZ
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Old 5th November 2012, 07:46 PM   #225
hesener is offline hesener  Germany
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which opamps are you using? sounds like it is oscillating with the servo cutoff frequency.... I used OPA134 with great results. I think Joachim mentioned once that they need to be FET inputs.....
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Old 5th November 2012, 07:49 PM   #226
pdul is offline pdul  Denmark
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Opa 134 and i have tried AD711 briefly just for the experiment
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Old 5th November 2012, 07:49 PM   #227
pdul is offline pdul  Denmark
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Both fet inputs
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Old 5th November 2012, 08:34 PM   #228
pdul is offline pdul  Denmark
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I have now tried to change the 1uf bypass of the opamp to 220nf, and the offset is still wandering, but with only +/-50mv
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Old 6th November 2012, 08:02 AM   #229
RCruz is offline RCruz  Switzerland
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Cool.... If you get it to + - 10mV it might not be audible
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Old 6th November 2012, 09:42 AM   #230
RCruz is offline RCruz  Switzerland
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I have been measuring the output of my running paradise and it wonders between +12mV and -5mV.... It sounds wonderfully as is.
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