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Post by angelodp on Sept 16, 2008 22:40:25 GMT -5
dear forum, I humbly ask for help on this. I have followed all the guitarnuts instructions to a T and i still have a guitar that hums in 1 3 5 . The guitar is dead quiet in 2 & 4 and ok in 1 3 5 in clean. OD get noisy on 1 3 5 The shielding seems to have done little to help. My room has a power conditioner, I did turn off the florescent lights and monitors and dimmers. Please note that I have added a separate cap for each tone control and grounded them both to the star ground.
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Post by ashcatlt on Sept 16, 2008 22:56:30 GMT -5
Welcome.
From the pics it looks like you did a heck of a lot better job than I did on mine. I'd assume that with that kind of attention to detail you've gone through and tested to be sure that all of the foil pieces actually are continuous to ground.
Seems like I just wrote this, but I'll put it a slightly different way. Guitars are noisy! Is it more noise than you can live with? Is it actually noticeable when you're actually playing? Would it sound like a real electric guitar if there wasn't some little bit of buzzing?
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Post by newey on Sept 17, 2008 8:53:13 GMT -5
Angelodp-
Hello and welcome! You don't have to humbly ask for help, we also help the brash and obnoxious around here as well! ;D
Ash is right, very nice shielding job and a thorough post. I have no idea why you are still experiencing noise in an amount that is apparently bothersome to you- or you wouldn't be posting.
OD devices will inject some noise, that's just the nature of those things.
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Post by D2o on Sept 17, 2008 12:11:16 GMT -5
dear forum, I humbly ask for help on this. I have followed all the guitarnuts instructions to a T and i still have a guitar that hums in 1 3 5 . The guitar is dead quiet in 2 & 4 and ok in 1 3 5 in clean. OD get noisy on 1 3 5 The shielding seem to have done little to help. My room has a power conditioner, it turn off the florescent and monitors and dimmers. Please note that I have added a separate cap for each tone control and grounded them both to the star ground. Hi Angelo, and welcome to GN2! I like your first post! Good pictures and diagrams, and - as Ash has pointed out - I also really like your neat work. I think I see three caps in your schematic - is that correct? ... but none of them appear to be the correct spec for the 400V catastrophic DC blocking cap. I can only see two caps in the actual photo ... did you ever intend to implement the .33uf 400V DC blocking cap while you are doing this? (I may be missing it) The star ground in the picture is hidden behind a wire, but is your star ground somehow attached to the 5-way switch? Shouldn't it be insulated? D2o
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Post by ashcatlt on Sept 17, 2008 12:48:57 GMT -5
I think the 3rd cap is a treble bleed across the volume, but it doesn't show in the closeup photo. Of course, neither does the shielding, so it must be some sort of "before" or at least, intermediate shot. The other photo is too small to be sure.
It's only necessary to insulate the star ground if there is a safety cap. I think he's left that out and is star grounding where the switch frame meets the pickguard, which accomplishes grounding the shield itself.
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Post by D2o on Sept 17, 2008 13:32:23 GMT -5
I think the 3rd cap is a treble bleed across the volume, but it doesn't show in the closeup photo. Of course, neither does the shielding, so it must be some sort of "before" or at least, intermediate shot. The other photo is too small to be sure. It's only necessary to insulate the star ground if there is a safety cap. I think he's left that out and is star grounding where the switch frame meets the pickguard, which accomplishes grounding the shield itself. Ash, I think you're right about the treble bleed. Angelo, Something isn't jiving ... the picture of the shielded guitar seems to have only one cap on the tone (plus one on the volume). Are the pictures you have included representative of the final wiring? Were you maybe thinking of two tone caps, opted for one tone cap and stated two tone caps in error, or am I simply not seeing the second tone cap in the picture? D2o
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Post by ChrisK on Sept 17, 2008 16:55:55 GMT -5
Does every point on the body cavity copper shielding make good contact with every other point (measured at less than 1 Ohm)?
Does the pick guard shield make good contact with the body cavity shielding when installed (measured at less than 1 Ohm)?
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Post by angelodp on Sept 17, 2008 20:55:42 GMT -5
Thanks for the warm welcome.... Mia culpa
I made some basic errors as pointed out.
I moved the copper ground nexus from the 5 way switch to the right and insulated the entire gaggle of wires as well as the lead to the DC blocking cap. I added the DC blocking cap --- 250V 1uf. I also added the ring terminal under the vol pot as the connection point for the DC cap.
I made some seriously poor assumptions about the grounding scheme and need for the ring terminal ( under vol or tone pot ) and the use of the DC cap.
It has come around quite a bit. I do have a reduction in almost all extraneous buzz. there is some 60 cycle hum... but its improved. I doubt it can be fully eliminated.
In non OD mode on my amp, its very quiet. 2 & 4 silent 1 3 5 improved and quieter.
The most interesting by product has been the Sonic character of the Guitar, which has improved highs and mids and great bottom. Its more spanky.
Thank you all for the input. I would say the need for isolated ground nexus and ring terminal, along with DC cap are integral to success..... or ... follow instructions LOL
pics and graphic to follow
cheers Ange
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Post by newey on Sept 17, 2008 21:26:00 GMT -5
Ange-
You are truly rapid! You first posted the problem at 11 or so last night, and some 19 hours later you've already fixed it! Congrats on your success.
As we have said many times around here, a good shielding job will knock hum back quite a bit, but will not totally eliminate it.
How is it with your OD on? You indicated that was the major problem as originally configured.
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Post by angelodp on Sept 17, 2008 21:33:41 GMT -5
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Post by newey on Sept 17, 2008 22:26:24 GMT -5
Again, nice job!
However, your photos are so big they're blowing off the page. I know you want to show the detail- that's very helpful. But not everyone has a broadband hookup.
If you could downsize those a bit it would be appreciated!
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Post by angelodp on Sept 17, 2008 23:08:30 GMT -5
oops, are we ok at this size
thanks
PS I just went and put the vol cap back in and its great.... .0012 uf helps at lower vol as you all know.
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Post by D2o on Sept 18, 2008 8:32:15 GMT -5
oops, are we ok at this size thanks PS I just went and put the vol cap back in and its great.... .0012 uf helps at lower vol as you all know. Angelo, Great job! And thanks for coming back and sharing what you did and posting more pics and stuff (and for adjusting the size - yes, it's golden now). Lots of folks come and, once they get their answer, practically leave a vapour trail in their haste to leave with the goods. You have come back to share - and you posted pics .... AND you do good work ... AND we even learned from it. We like and appreciate that, as it gives us a chance to learn as well. Hope you'll be sticking around. D2o
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Post by angelodp on Sept 19, 2008 12:08:53 GMT -5
Thanks for the support here...... and here is the next one which went very quickly now that i have the method worked out. cheers A
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Post by D2o on Sept 19, 2008 12:14:15 GMT -5
Very nice work! I am glad you came along, and you can bet that your post / work will be referred to often. +1 Thanks again for sharing this. D2o
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Post by angelodp on Sept 19, 2008 13:04:02 GMT -5
How do i get notices sent to my e-mail.... of new posts ..... sorry if thats a duh question!!
A
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Post by D2o on Sept 19, 2008 13:06:23 GMT -5
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Post by warmstrat on Sept 20, 2008 5:24:37 GMT -5
I think angelodp does the best shielding/wiring job out of all of us. This is amazing.
Just look at those cable ties.
Just... wow.
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Post by warmstrat on Sept 24, 2008 12:42:05 GMT -5
Aaah, he deserves it.
+1 to angelodp.
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