Your jack ground should attach to the virtual ground.. Use isolated power NO DAISY CHAIN.. there are a few ways to use a charge pump style power supply to allow the use of a daisy chain power, but you need to regulate the power to +/-3.6V for the modulation chip.. The -3.6V is the ground from your power supply.. Using a daisy chain connects the signal ground and power ground nodes and prevents the unit from operating.. I think you might be able to connect the jack ground to the -3.6V (power supply ground) and you might be able to use a daisy chain power supply, experiment with this on a breadboard.. I built a few of these and separated the signal and power grounds and use a different power supply than the rest of the pedals on the board.. You can use a 9V battery and add a power switch or get and isolated switching jack..commathe wrote:A question for people who built this: how did you ground the jacks if you used a power-supply?
I'm looking at the schematics and I see a virtual ground between +/-3.6V. I surely can't ground my jacks to that? I feel like that will create a ground loop. Am I right in assuming I have to ground my jacks to the power-supply ground? Also, since I am using a volume pot after the second op-amp, surely I have to ground that to the power-supply ground too?
The master vol control you are adding after the 2nd opamp should connect to the virtual ground node.. You can also add a Clean signal to the circuit like the project that was brought up in this thread for examples (General Guitar Gear, i think)..
I hope this helps..