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Old 28th May 2004, 10:58 PM   #11
diyAudio Member
Join Date: Sep 2002
Location: Denmark
Hi Jan,

Thanks for the help. I will try to get a non-polar cap to the input.

Though my preamp already has a output cap I thought that was enough, but probably not...

Still is it normal that there is such a big difference between using the gainclone with a passive volume where I get DC 20-50mv and using a preamp and getting up to DC 1V both places using a 10K pot?

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Old 29th May 2004, 12:01 AM   #12
ped is offline ped  United States
diyAudio Member
Join Date: Apr 2003
Location: PA
Hi Seve,

If I understand your post correctly you have stable and acceptable levels of dc offset with the gainclone by itself. When you connect your preamp and source you get large and varying levels of dc offset.

When you connect the preamp and source, are you playing music when you measure the dc offset? If so, try measuring the offset with source and preamp connected but no music playing and see what you get.

Check out this thread here:

LM1875 problem

I'm certainly no expert, and someone please correct me if I'm wrong, but I don't think you should measure the dc offset with music playing as it modulates the dc offset and produces erroneous measurements.

Good Luck!
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