Sparkle Boost/son of a screamer

[hohlamazoo]

Just have a quick question for you guys.  I have a sparkle boost and son of a screamer on my two breadboards.  When I run a jumper from one to the other to share a common power supply and ground, I get a high pitched oscillation.  Separately, they are fine. Any ideas? Thanks.

[superferrite]

Had this problem with a fuzz and boost once.  I imagine it's common enough that you'll get aa quick answer!

[hohlamazoo]

Yeah, it's driving me crazy.

[TimWaldvogel]

Are you just running the jumper from 9v or are you sharing the supply from +-4.5v?

[hohlamazoo]

Right now I'm just running a jumper from the 9 v. I was hoping they'd be able to share a box someday. I'm going to mess with it a little more tonight and let you know. Thanks.