Hi E2E,
I am newbie and I am trying to build amplifier circuit using OPA 549s as in the following schematic.
This schematic was designed by my senior few years before and I was told that it worked. But when I built it and tested, the result of the output have a lot of noise as below.
I am very sure that I connected all components as the schematic. So now I am very confused why it happens. I dont know whether the schematic is incorrect or there are problem when I heal components together so the connection between components are not good.
Any thoughts of things to check or clarifications I can make?
Thanks a lot.