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Hello, I have a problem. I decided to make a mini stereo guitar amp, using 2 little chip amp based on the chime amp. I soldered everything, but there's a ground problem I suppose. There's this annoying hum when I plug only one cabble and when I touch the second input the hum is almost gone but still there. I rewired everything and still the same problem.

Is there something I don't know about doubling 9V to power 2 effects with the same power supply. Is there a way to isolate the ground on each pcb?

First pic shows the schematics and the second is the two pcbs connected together (the blue line is the ground path)

Hello people, I'm new to all of this DIY guitar pedal thing. I know this is not a pedal, but it's a little project that looked easy enough for me to do. I made a PCB design using DipTrace and I was wondering if everything was OK with it, did I make any mistake? Here's the schematic and my final design, can someone confirm that I've done it right?