Infinidrive Filter Switch

[AdrianSunn0)))]

Hey yall. Built an Infinidrive twice, and both times the filter switch brought some high pitch op amp oscillation, just curious if anyone has built this one before and what the filter switch is suppose to be doing?

 

[DailyDovetails]

Hmm my thought would be to look at C3, C4 or R9. I think it’s a low pass filter so it should bleed off some of the highs. Do you have a picture?

 

[Robert]

Where did you get the InfiniDrive PCB? These haven't been available for years.

What value do you have installed for C6?