Hey Guys,
Sorry to dig up an old thread.
I built a Gravity Wave, and have it on the test rig. Everything is working good, but I too am having the Dimension pot problem. Starts whining between 10-20%. I had done a lot of reading before this build, so I thought I'd be proactive, and went ahead and did the ( C9 change to 33n / R9 change to 10k ) from the start. These are the only mods I did to the original schematic. Before I start dicking around with things, I was wondering if anyone else had this result with just these changes? I thought about changing C20 to 4.7uF, but wouldn't this just make the rate speed slow down a bit? I don't think it would have any bearing on the whining at the dim pot issue.
Thanks, Jeff