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The Ultimate DIY Part 2 ? The KGITSOJC

kevin gilmore
in Do It Yourself

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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? 

 

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    • kevin gilmore
      kevin gilmore

      Sure there is a schematic. Its in my head somewhere. There will be an official schematic at some point. There is a bunch of different ways to build it including single ended only, and balanced/sin

    • c12mech
      c12mech

      Has there been any work on this lately?  I really want to do this one.

    • mypasswordis
      mypasswordis

      Input JFETs just came in the mail. Most of them look real, there are a couple 2sk170s that have funky looking printing on them that I'm not sure about. Will measure IDSS later.    Finally the projec

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