To much noise after wiring. Need Help! - Jemsite
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post #1 of 13 (permalink) Old 01-09-2014, 12:49 AM Thread Starter
 
Join Date: Nov 2009
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To much noise after wiring. Need Help!

Hi guys!

I received my custom warmoth guitar. Yesterday i wired it. The ground wire from under the bridge and two (ground and hot) from DiMarzio switchcraft output jack. I've put in the DiMarzio pre-wired high power pickguard and got too many noise.

When i put my hands on strings, the noise gets even louder.

Please advice, what can be the root of this problem?
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post #2 of 13 (permalink) Old 01-09-2014, 08:13 AM
 
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Re: To much noise after wiring. Need Help!

Could be a grounding issue?
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post #3 of 13 (permalink) Old 01-09-2014, 08:43 AM Thread Starter
 
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Re: To much noise after wiring. Need Help!

I guess. But not that simple. I belive i've just reversed hot & ground from input jack. I will swap them today asap i get my hands on guitar and write here the feedback. But i'm not sure this is the reason...

The guitar is build from scratch and the control cavity is just empty (wood only). Do i need some sort of shielding in the cavity?
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post #4 of 13 (permalink) Old 01-09-2014, 10:02 AM
 
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Re: To much noise after wiring. Need Help!

Quote:
Originally Posted by Rico010 View Post
Do i need some sort of shielding in the cavity?

Yes you do.
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post #5 of 13 (permalink) Old 01-09-2014, 10:47 AM
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Re: To much noise after wiring. Need Help!

Quote:
Originally Posted by Rico010 View Post
The guitar is build from scratch and the control cavity is just empty (wood only). Do i need some sort of shielding in the cavity?
No you don't.
The fact you're getting loud noise when touching the strings has nothing to do with not having a shielded control cavity, obviously there's something wrong with wiring, I don't know how it's possible cause there are wiring diagrams all over the net, you just have to choose one and follow it.
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post #6 of 13 (permalink) Old 01-09-2014, 12:09 PM
 
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Re: To much noise after wiring. Need Help!

reversal of the output jack polarity may be the culprit.
I would shield the guitar as well. You can get all kinds of problems with interference.

If you play into an audio interface you wouldnt believe the noise a USB bus can produce without shielding.
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post #7 of 13 (permalink) Old 01-09-2014, 12:37 PM
 
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Re: To much noise after wiring. Need Help!

Quote:
Originally Posted by POS RG View Post
reversal of the output jack polarity may be the culprit.
I would shield the guitar as well. You can get all kinds of problems with interference.

If you play into an audio interface you wouldnt believe the noise a USB bus can produce without shielding.
This right here.
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post #8 of 13 (permalink) Old 01-10-2014, 02:40 AM Thread Starter
 
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Re: To much noise after wiring. Need Help!

Thanks for advices! Yesterday i changed the cables coming from output jack and the problem is gone. Somehow i have reversed the cables - accidentally i believe.

Actually i play into Line6 POD HD and got no noise while playing.

But now, if i take off my hands from string and stay while not touching them, there is a noise which is gone when i put my hands on strings. My knowledge says to me, it must be the ground cable soldered to the bridge from the inside and goind to ground point. I believe this cable is not working fine. I'll try to resolder another cable this week. Is there any other reasons why i can get that kind of noise?
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post #9 of 13 (permalink) Old 01-10-2014, 06:13 AM
 
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Re: To much noise after wiring. Need Help!

if the ground hum is gone when you touch the strings, the bridge ground should be correct. Shielding would be the next thing to address. The guitar I just built is so well shielded, that I can't even hear a hum with my hands off the strings on a cranked amp with a humbucker in use. With a single coil it's quieter than most people's humbuckers. well worth it for a guitar you plan to record with. I used copper foil and I think it's better than shielding paint if you do it correctly. I am very happy with the result.

Here is my build thread....you can see the shielding there.

http://www.jemsite.com/forums/f19/ne...ld-129360.html
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post #10 of 13 (permalink) Old 01-10-2014, 06:59 AM Thread Starter
 
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Re: To much noise after wiring. Need Help!

But i thought, bridge shielding should take off that hum when you are not touching the guitar. I always thought that when i touch the guitar, "electricity" just goes down from my hands to my legs and to earth. So i was wrong?

Last edited by Rico010; 01-10-2014 at 09:06 AM.
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post #11 of 13 (permalink) Old 01-11-2014, 04:45 AM Thread Starter
 
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Re: To much noise after wiring. Need Help!

Well, i guess i won't change anything more, because i got no hum now with my hands on guitar (strings & bridge) even on the higher gain settings (i'd say extreme gain for me). DiMarzio is great, and this double blade Fast Tracks are unbelievable )) I've that kind of a vintage, but these are humbuckers and the tone is reach!
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post #12 of 13 (permalink) Old 01-11-2014, 05:39 AM
 
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Re: To much noise after wiring. Need Help!

Quote:
Originally Posted by Rico010 View Post
But i thought, bridge shielding should take off that hum when you are not touching the guitar. I always thought that when i touch the guitar, "electricity" just goes down from my hands to my legs and to earth. So i was wrong?
When you're not touching the strings, your guitar is actually picking up hum from the very small electromagnetic field your body is giving off.
The ground wire on the bridge is so that when you touch the strings, your body becomes 'common' to the ground, so any hum your body is adding gets cancelled out.
I may not be explaining it very well, but to make it simple: when you touch the strings it should stop that hum, when you let go it should hum. Perfectly normal.
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post #13 of 13 (permalink) Old 01-14-2014, 02:47 PM
 
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Re: To much noise after wiring. Need Help!

Another small tip (which many people do not do) is to also ground the metal pieces of the switches. Make sure you do not ruin them with too hot solder iron. I did not even solder them. Just used a very thin stripped bare wire from the switch to the common ground. It is not needed but might reduce clicking and hum when touching the switch(es) without touching the strings.

Second tip: my POD 2.0 adapter did not have a ground connection. It therefore hums a lot in general but what I noticed is that when I place the POD adapter next to the Pod the noise is much more. The trick is to put the adapter on the floor.
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