TC1980 Posted December 16, 2022 Report Share Posted December 16, 2022 Kevin suggested using 20K feedback resistors, I soldered those in, as well as changed most of the other resistors to 0.1% 2512 smd resistors. Input jfets are from diyaudio.com store, matched within 0.1ma. Got new transformer and now using GRLV set to +/-20V, I cannot get the offset close to zero, +output to ground 0.1-0.2mV/other channel 0.1-0.3mV, -output to ground about 10mV/other channel around 17mV. measured between + and - output, one channel around 12mV, the other channel around 19mV. I measured without connecting anything to the inputs or outputs. What should I change to get rid of this problem? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.