Hi there I have built this sweep EQ which works however, I am having a major hum problem with it.
At first I thought it could have been a ground loop on the board however, I also built this circuit into a mic preamp with a baxandall tone control after it. This circuit worked fine when the opamp for the sweep EQ was removed however when I put it back in it started again. This has given me the conclusion its something to do with the circuit, as it does the same thing on two separate boards and is not a ground issue. Any help would be greatly appreciated as I am pretty much stuck thanks.
At first I thought it could have been a ground loop on the board however, I also built this circuit into a mic preamp with a baxandall tone control after it. This circuit worked fine when the opamp for the sweep EQ was removed however when I put it back in it started again. This has given me the conclusion its something to do with the circuit, as it does the same thing on two separate boards and is not a ground issue. Any help would be greatly appreciated as I am pretty much stuck thanks.