Home › Forums › Usage › Circuit fails in AC analysis with 20% applied feedback but not with 50%? › Reply To: Circuit fails in AC analysis with 20% applied feedback but not with 50%? 2. February 2024 at 2:53 #8170 tomhajjarParticipant You need to add a capacitor from R14 to ground called C2 so the OpAmp and transistor are biased properly. This reply was modified 8 months, 1 week ago by tomhajjar. This reply was modified 8 months, 1 week ago by tomhajjar. Attachments:2024-02-01_205258.jpg