education An amplifier when first built has an open loop gain of 120 after a while due to ageingthis falls to 90. Calculate the percentage reduction in gain. Posted on May 4, 2021May 4, 2021 by Emperorelectricalworks Emperorelectricalworks Evolving education world wide 🌎 How to calculate the change in volt. gain if it falls to 50%, volt. gain is 1000 NEGATIVE FEEDBACK How do you evaluate sin and cos if tan = ¾ and theta ranging from 0 to 90. TRIGONOMETRY ENGINEERING