Troubleshooting help--DMM content

adrianlee · Post by **adrianlee** » Thu May 10, 2012 10:02 pm

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.

kosta · Post by **kosta** » Thu May 10, 2012 10:15 pm

Maybe a grounding problem with the DMM? How is it powered?

MEC · Post by **MEC** » Thu May 10, 2012 10:15 pm

Sounds like you may have a ground loop.
How are you powering the DMM?

^Great minds think alike. :lol:

adrianlee · Post by **adrianlee** » Thu May 10, 2012 10:17 pm

The adapter provided through EHX. The 24v one.

Edit: And an off brand surge protector---i really should upgrade that at some point.

kosta · Post by **kosta** » Thu May 10, 2012 10:21 pm

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.

MEC · Post by **MEC** » Thu May 10, 2012 10:36 pm

Does it hum with the pedal off or only when it's on?

adrianlee · Post by **adrianlee** » Thu May 10, 2012 10:39 pm

MEC wrote:Does it hum with the pedal off or only when it's on?

Both. It's unbearably loud, too.

MEC · Post by **MEC** » Thu May 10, 2012 11:15 pm

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.

adrianlee · Post by **adrianlee** » Thu May 10, 2012 11:17 pm

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.

smallsnd/bigsnd · Post by **smallsnd/bigsnd** » Thu May 10, 2012 11:22 pm

plug both amps into the same surge protector and see if that helps

devnulljp · Post by **devnulljp** » Thu May 10, 2012 11:48 pm

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?

adrianlee · Post by **adrianlee** » Mon May 14, 2012 11:44 am

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?

smallsnd/bigsnd · Post by **smallsnd/bigsnd** » Mon May 14, 2012 1:57 pm

plug everything into the same surge protector?
pedalboard, DMM, amps, etc

Officer Bukowski · Post by **Officer Bukowski** » Mon May 14, 2012 3:21 pm

Dude I'm having the same problem with an echo base delay that I built. It's driving me insane.

adrianlee · Post by **adrianlee** » Tue May 15, 2012 9:01 am

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!

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Troubleshooting help--DMM content

Troubleshooting help--DMM content

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