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Old 3rd February 2013, 01:02 PM   #3881
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Do you find the servo doesn't impact negatively the sound?
The most common error is to consider servos outside from the signal path. They are in. So it is necessary, if you are looking for the best performances (and sound quality) to care about the IC performance (ultra low distortion and noise) and cap quality. If you achieve-it, and if the FC of the servo is low enough to have no phase shift in the audio range, you will have no change on sound signature.
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Old 3rd February 2013, 01:06 PM   #3882
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The most common error is to consider servos outside from the signal path. They are in. So it is necessary, if you are looking for the best performances (and sound quality) to care about the IC performance (ultra low distortion and noise) and cap quality. If you achieve-it, and if the FC of the servo is low enough to have no phase shift in the audio range, you will have no change on sound signature.]
Has this servo being designed in such a good way? Should I go for this circuit?
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Old 3rd February 2013, 04:29 PM   #3883
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What is the IC you gona-use ?
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Old 3rd February 2013, 04:38 PM   #3884
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What is the IC you gona-use ?
TL072. Should I use other?
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Old 3rd February 2013, 05:56 PM   #3885
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Yes, a low noise, low HD FET input one. like OPA627/827 ?
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Old 3rd February 2013, 06:29 PM   #3886
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OPA132 is a nice middle ground solution also IMHO.
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Old 3rd February 2013, 07:04 PM   #3887
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Please be pacient with my ignorance... Does a different opamp requires changes to circuit (compensation caps or others) or can I just swap the opamp leaving the circuit unaltered?
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Old 3rd February 2013, 07:17 PM   #3888
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Does a different opamp requires changes to circuit (compensation caps or others) or can I just swap the opamp leaving the circuit unaltered?
Tl 072 was a dual OPA, one side not used, not very elegant. So , you will have to modify the board accordingly to feat a single OPA. All OPAs have the same pin-out, but differs from single to dual.
You can chose the ones you want, as long as they are fet Inputs, and unity gain stable. Just add, on the printed circuit a compensation cap in // with the feedback resistance, that you will use, or not.
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Old 3rd February 2013, 07:24 PM   #3889
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Just add, on the printed circuit a compensation cap in // with the feedback resistance, that you will use, or not.
You mean the 2k2 resistors? Both paralleled with caps? What value should the caps be?

Thank you
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Old 3rd February 2013, 09:48 PM   #3890
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You mean the 2k2 resistors? Both paralleled with caps? What value should the caps be?

Thank you
can-you bring me a link to the schematic ?
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