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Every pedal I buy has a loud buzz. Help!!

Any chance you sit your pedalboard on top of an amp instead of the floor? A long shot, but I've seen it happen. The pedal that amplifies sound is sitting on top of the noisy part of the amp, I think the transformer usually, Agedhorse may smack my hand on that statement, so I'll just go with "the noisy part". And then, as previously mentioned, try a battery to rule out power supply issues. I picked up a couple of these so I could try battery power without cracking open the pedal. Lazy or practical?

https://www.amazon.com/AUGIOTH-Battery-Converter-Center-Negative/dp/B091FFHZ71/ref=sr_1_2?crid=3Q6KZ9CU2SBJ3&keywords=9v+battery+center+negative&qid=1643307661&sprefix=9v+batter+center+negative,aps,44&sr=8-2&th=1

Side note: I wonder how safe it is to run a non-battery compatible pedal w/ these things in a live situation. Lol
 
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I've been testing this pedal all by itself, not too close to the amp, and not attached to the other stuff on the pedal board. I'll try it out next week at a gig, and hook it up to the rest of the stuff on the board (tuner, compressor, clean boost, and another fuzz pedal not turned on at the same time). At this point, the buzz is still there, but it's much diminished and manageable now that I've taken the battery out of it.
 
I was about to ask what kind of bass but LORDY, I actually went back and read, hallelujah, instead of just asking blind. So it's not active (not just the obvious low battery question but also because some preamps send a signal that is hotter than some classic fuzz circuits to not cooperate with).
Lighting?

Any weird chance you have replaced your lamps/bulbs with LED and they are on an older dimmer switch?
Just poking here to eliminate things.
 
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Yes, I'll do that. It's a Fender Mustang P/J I bought just this year. Does a brand new bass from Fender need to have extra shielding added to the cavity just to run a fuzz pedal?
Im Just gonna add my2¢ :thumbsup: I say double check your Ground wires! I once bought a used GK amp for a song because it made a terrible hum/Buzz when plugged in! I convinced seller it was his amp not my bass! but when I got home I checked the wiring to find a loose ground, re soldered and Voila! it was my bass!! no more buzzing! so no matter how sure you are just double check that control cavity(easy fix/solution: )
 
So first of all ... I haven't read all the posts in this thread - and here I am replying already. Does that make me a bad person?

When I was researching power supplies for pedal boards ... a lot of supplies are sold as "isolated" but most of them (the cheaper ones for sure) have the outlets isolated only so that if one shorts it won't short the rest of them -- however they still share a common ground. The more expensive ones have "ground isolated" supplies so each power output has a separate ground. In order to do that (separate ground) the ones I've looked at use a transformer with several secondary coils on the same primary - that way each secondary coil is ground isolated. But being the tightwad that I am - I simply bought several inexpensive supplies as each of those is its own individual transformer and completely ground isolated from the next one --- and several of them on a power strip is not any larger than a multi output true ground isolated supply -- and costs much much less. Not as elegant looking.

Anyway the point of all that is most pedals (especially digital ones vs analog) will buzz and hum if you daisy chain the power ... and even the so called "isolated" multi supplies are really just daisy chained inside but with some diodes to prevent a short from taking them all out. I get super quiet pedals using the multiple dongle method.
 
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Basic trouble-shooting:
1. turn on amp, turn off standby
2. plug in amp-in cord
3. plug in pedal, without battery, with batt., with power supply(s)
4. plug in pedal-in input cord
5. plug in bass(es)

One of those steps will likely and obviously increase the noise; when you find that, try variations (ex., new outlet, new cord, new power source, new bass) and/or post back.
 

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