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31st January 2013, 09:45 AM
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#1 |
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diyAudio Member
Join Date: Jul 2003
Location: Dona paula, Goa
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Trimming DC Offset on Nico's preamp
I have assembled this preamp(link below) with the intention of capacitor-less coupling. One of the channels is having -6mV and the other shows -16mVdc approx. The complementary matching of these BD139-16 n BD140-16 from the twenty each I purchased was impossible and I want the offset to be as low as possible. Is there any changes in resistors/or addition of preset I can incorporate so that I can trim the offset.
Low Distortion High Dynamic Range Pre-amp Help needed Gajanan Phadte |
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1st February 2013, 03:20 AM
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#4 |
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diyAudio Member
Join Date: Jul 2003
Location: Dona paula, Goa
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I tried to trim one of R3/R4, but I did not like the way it(DC offset) drifts.
My worry is that if I connect this directly to my power amp, it will have big DC at the output. Gajanan Phadte Last edited by gmphadte; 1st February 2013 at 03:20 AM. Reason: correction |
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