R.G.'s Quick and Dirty Oscillator + Ruby = Strange Behavior...

[sixstringphil]

I was working on a project this afternoon and ran R.G.'s Improved Q&D Oscillator  into a ROG Ruby I built. Into my other guitar amps, the tone generator works fairly well. But when I go to the Ruby, the tone's frequency changes when I adjust the Ruby's gain and volume controls. Anyone know why this happens? I'm trying to get a signal generator, audio probe, amp, and speaker into one box for troubleshooting circuits. Thanks!

Here are links to the schematics...(wasn't sure if it was 'ok' to post the pics)

http://www.runoffgroove.com/ruby.html
http://www.aronnelson.com/gallery/main.php/v/STMs-Circuit-Ideas/Quick+and+Dirty+Audio+Oscillator.PNG.html

[sixstringphil]

Problem seems to go away when they don't share the same power supply. When I run the Ruby off a 9v, the problem goes away. BTW, I'm running the output of the Q&DO straight to the Ruby input. I'm taking the ground and 9v+ for both from the same DC jack. Any problem with that?

[Wales]

I was just about to make the same project, tone generator, probe and ruby all in one. I thought i was so smart, but you beat me to it. I hadn't found the new Q&D oscillator so I was using the original schematic. I wish people would have answered you though.

Were you ever able to run them off of the same power supply or do you sill run the ruby on batt.