May 31, 2020 #21 W Winsu Full Member level 3 Joined Oct 25, 2017 Messages 174 Helped 2 Reputation 4 Reaction score 4 Trophy points 18 Activity points 1,691 If this does not work, you need to look deep in the op-amp side. Power supply impedance is too high OR power supply is having too much voltage ripple. The question is high much ripple is acceptable at the op-amp stage? I do not know but you have to dig. and dig more. Click to expand... Adding capacitance to the power rail that feeds the op amps should fix the problem, isn't it? - - - Updated - - - It is tested in a test house, and the level of light dims and it is visible by the human eye.
If this does not work, you need to look deep in the op-amp side. Power supply impedance is too high OR power supply is having too much voltage ripple. The question is high much ripple is acceptable at the op-amp stage? I do not know but you have to dig. and dig more. Click to expand... Adding capacitance to the power rail that feeds the op amps should fix the problem, isn't it? - - - Updated - - - It is tested in a test house, and the level of light dims and it is visible by the human eye.