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PostPosted: Mon Jan 02, 2017 9:36 am 
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I just finished my first BYOC project, the A/B True Bypass Looper as the title suggests. Actually I built it twice. First time only the the LEDs worked, second time seemed to be OK... but now I realize there's an issue. If I've got the 2 channels going (either as loops or as A/B channels) and I'm using channel A, I can hear pedal noise from channel B in the background. Distortion pedal noise, and turning pedals on/off comes through the A channel. The pedals don't affect the sound of A, they just add a ton of noise. Without seeing what I've done, can someone suggest what or where the problem might lie? Thanks in advance!


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PostPosted: Mon Jan 02, 2017 1:09 pm 
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alcolmx wrote:
...Without seeing what I've done, can someone suggest what or where the problem might lie?

It's a LOT more difficult that way. Please post pics and help us help you. Please make them large, well-focused, well-lit shots of BOTH sides of the PCB and all of your jack and switch wiring.

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PostPosted: Tue Jan 03, 2017 11:13 am 
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Here are some pics of what I've done:
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PostPosted: Tue Jan 03, 2017 11:15 am 
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PostPosted: Tue Jan 03, 2017 11:16 am 
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PostPosted: Tue Jan 03, 2017 11:46 am 
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I can't see any incorrect layout issues; it's tough to make a lot of things out. There are a couple of things you can try though.

1) Reverse the order of your pedals in the looper. Does the noise follow the pedal currently in loop B to loop A?

2) Try clipping the wire tie and re-routing the A and B loop wires so that they are more separated. Group the wire running to the A loop send and return jacks together, and B loop wires together, and rout them away from each other as much as possible. Maybe some of the B loop wires going to the A/B switch are too close to some of the A loop wires.

3) If you use a buffered bypass pedal, like a Boss tuner or something, try running it in front of the looper. Sometimes buffering the signal will kill the interaction noise.

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PostPosted: Tue Jan 03, 2017 12:31 pm 
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The first thing I would check is to make sure that there is absolutely no contact between each of the I/O jacks. Not only can a slight bit of mis-rotation cause contact between them, but also look for any stray bits of wire or solder that could cause a short. Do the same thing for the footswitches--inspect them very closely to make sure there's no shorting between lugs. A single strand of wire between two lugs will cause signal shorting.

If you need to get into more sophisticated troubleshooting, then checking point-to-point continuity between lugs on the switches and jacks with a multimeter may help pinpoint the problem.

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“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


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PostPosted: Wed Jan 04, 2017 8:19 am 
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Thanks for the tips guys... and for not tearing apart my shoddy workmanship :)
I played around with the rotation of the jacks and unclipped and separated the A/B wires and all is good. It's dead quiet now, no noise between channels.
Thanks again!!!!


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