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Troubleshooting help--DMM content
Posted: Thu May 10, 2012 10:02 pm
by adrianlee
Alright, so, at practice yesterday, I noticed that both my amps were humming incredibly loudly.
Through some trouble shooting, we (Rygot and myself) realized that it's due to my memory man. When using both echo and dry out, it causes crazy hum in both amps. Take one cable out (doesn't matter which) and the hum is decreased 100%. The cables coming from the dmm to amps are both brand new, so, I don't think that's the case. I tried contact cleaner--didn't help. We looked adjusted the ground switch on my quad, didn't help. It happens with any guitar, too.
Any ideas?
Rygot may be able to chime in with any info I've left out.
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 10:15 pm
by kosta
Maybe a grounding problem with the DMM? How is it powered?
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 10:15 pm
by MEC
Sounds like you may have a ground loop.
How are you powering the DMM?
^Great minds think alike.
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 10:17 pm
by adrianlee
The adapter provided through EHX. The 24v one.
Edit: And an off brand surge protector---i really should upgrade that at some point.
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 10:21 pm
by kosta
MEC wrote:Sounds like you may have a ground loop.
How are you powering the DMM?
^Great minds think alike.
I would try it wish a different power supply perhaps.
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 10:36 pm
by MEC
Does it hum with the pedal off or only when it's on?
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 10:39 pm
by adrianlee
MEC wrote:Does it hum with the pedal off or only when it's on?
Both. It's unbearably loud, too.
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 11:15 pm
by MEC
Well, it definitely sounds like it's creating a ground loop.
It's hard to tell why without looking at your setup and the pedal in person though.
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 11:17 pm
by adrianlee
MEC wrote:Well, it definitely sounds like it's creating a ground loop.
It's hard to tell why without looking at your setup and the pedal in person though.
Alright. Thanks for the info. Hopefully I can conjure up some black magic to fix it.
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 11:22 pm
by smallsnd/bigsnd
plug both amps into the same surge protector and see if that helps
Re: Troubleshooting help--DMM content
Posted: Thu May 10, 2012 11:48 pm
by devnulljp
smallsnd/bigsnd wrote:plug both amps into the same surge protector and see if that helps
Or can you ground lift or reverse the polarity on one of the amps?
Re: Troubleshooting help--DMM content
Posted: Mon May 14, 2012 11:44 am
by adrianlee
devnulljp wrote:smallsnd/bigsnd wrote:plug both amps into the same surge protector and see if that helps
Or can you ground lift or reverse the polarity on one of the amps?
Tried both of these and neither worked. Any other ideas?
Re: Troubleshooting help--DMM content
Posted: Mon May 14, 2012 1:57 pm
by smallsnd/bigsnd
plug everything into the same surge protector?
pedalboard, DMM, amps, etc
Re: Troubleshooting help--DMM content
Posted: Mon May 14, 2012 3:21 pm
by Officer Bukowski
Dude I'm having the same problem with an echo base delay that I built. It's driving me insane.
Re: Troubleshooting help--DMM content
Posted: Tue May 15, 2012 9:01 am
by adrianlee
smallsnd/bigsnd wrote:plug everything into the same surge protector?
pedalboard, DMM, amps, etc
I'll try that tonight. Hopefully my surge protector is large enough!