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Reversed Mono Jack Leads

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Palbert

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Hello all, I stumbled upon a solution last night that has me curious. I built the Nurse Quacky effects pedal on a breadboard and it sounded great except for a DC hum (at least thats what I thought it was). I tried different RC filters to see if I could get rid of that. I ended up trying a low pass and a high pass filter and they both had the same effect (hum completely gone) and that seemed odd so I just tried reversing the leads of my mono output jack to see if that was the culprit and it completely got rid of the hum. I was wondering why reversing the leads would cause a hum like it did?
 
No more ground loop..... Careful if you use those two circuits again because one's ground is the others VCC.
 
The RC filter I used wasn't in the Nurse Quacky circuit when I fixed it, I just switched the output leads from the Nurse Quacky itself. Only one circuit when the hum was present. Maybe there is still a ground loop in the Nurse Quacky circuit. Hmm.
 
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