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Conference napalm::guitar

Title:GUITARnotes - Where Every Note has Emotion
Notice:Discussion of the finer stringed instruments
Moderator:KDX200::COOPER
Created:Thu Aug 14 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3280
Total number of notes:61432

2185.0. "E.S.D. AND MUSIC: NOT A GOOD MIX!" by FREEBE::LOUVAT () Wed May 01 1991 10:03

    I was playing my guitar putting a recording together when I no-
    ticed an annoying "crackling" sound occasionally happening. I 
    thought it was a loose connection in either my cable or cold solder
    around the pickups and related electrical conections. After banging
    around on the scratch guard and twisting the cord into 20 directions
    at the same time I realized that there was no loose connections.
    However, the noise kept up and it was driving me crazy.
    Then it hit me....I play a lot of finger style and my fingers some-
    times rest on the scratch guard and occasionally brush it slightly,
    and upon doing so static discharge takes place resulting in the crack-
    ling. I was able to elliminate it by wetting the tips of my fingers
    with my tongue, but that is quite impractical to do while playing.
    I have an antistatic kit for desktop computors that I'm going to wash
    the scratch guard with. THis should take care of the problem but I hope
    it doesn't discolor the guard any...Oh well, looks are ok but it's the
    sound I'm after....
        Has anyone else ever run into this problem?
        All the grounding connections are as solid as a steel girder, so
    it's not the lack of ground that's causing it to be noticeable. At any
    rate, now I know how to deal with it so it's really not much of a pro-
    blem any longer, but it was a bit frustrating at first.
    
T.RTitleUserPersonal
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2185.1Snap, Crackle, PopIXION::ROSTLobster in cleavage probeWed May 01 1991 10:098
    I have found that on almost all guitars, if you are not touching *any*
    grounded part (like the strings) when you *do* make contact again,
    there is a "click" noise, the volume of which often has to do with how
    well the guitar is shielded in general.  On pots, this sometimes makes
    for a "scratch" sound like the pot is dirty, but the sound goes away
    when you are in contact with the strings.  
    
    						Brian
2185.2GOES11::G_HOUSEMarshall Stack PukeWed May 01 1991 11:424
    Getcha one of those field service wrist ground straps and hook yourself
    up to the bridge.
    
    ;^)
2185.3GSRC::COOPERMajor MIDI Rack Puke (tm)Wed May 01 1991 11:503
    He's kidding folks...  Bad idea if there is a bad ground anywhere...
    
    jc (Who got lit up a few times...)
2185.4LEDS::BURATIrih-bah...RIH-BAH!Wed May 01 1991 12:146
    
    This came up about a month ago. (See 704.42). Is there a ground
    plate under the pickguard?  Maybe that's why Leo Fender put it
    there.

    --rjb
2185.5PELKEY::PELKEYYOIKES and AWAY!!!Wed May 01 1991 13:4210
<<jc (Who got lit up a few times...)


Yeah, talk about high enery music...  I put my lips on my  SM58, 1 night
when my amp was (Unbeknownst) plugged in to a bogus out let in a club,, 
woke up 45 seconds later in a mass of fallen guitars and cymbol stands...  
Knocked me right on my ass..  I haven't been the same since... 60 amps,
right on the kisser!

:8^\
2185.6DNEAST::BOTTOM_DAVIDvictim of unix...Wed May 01 1991 14:0910
       If you install the dbii rfi mod, this will seriously reduce the
    amount of static you get off the pickguard.
    Essentially you buy some aluminum auto body tape and cover the inside
    fo the pickguard, and the pickup cavity with it, when you're done tack
    a ground wire directly to it (I use a little wood screw with a wire
    attached). This reduces hum, especially if you're using single coil
    pickups, and static from the pickguard is reduced.
    
    dbii
    
2185.7Thanks for the tipsFREEBE::LOUVATThu May 02 1991 12:2815
       I think you've got it!!!!If I remember correctly...when I was in-
    stalling the electronics on that pickguard, I saw the foil backing al-
    ready there. I ASSUMED that the grounding on the pots/tailpiece/jack
    and switches would all be common to the foil....Maybe I just need a 
    better connection... The idea of couching the whole cavity with foil
    may very well do it all for me...Thanks for the tips!!!
       RE: .5...I certainly can identify to that "shocking" experience you
    had...It's happened to me so many times. Maybe that's why I'm able to
    hear the snow hit me in the head in the winter..I used to have a full
    head of hair when I started to play the electric guitar. However, that
    is a far cry from a jolt of static.. That noise is ZZZZZZZBOOOOM!!!!!!
    Then, as I recall, light flashes, my eyes cross, and if I'm in the mid-
    dle of saying somthing, I'd sometimes bite my tongue....WHEW!!That is 
    quite a jolt to the senses.
       Again, Thanks for the input...............
2185.8That ain't staticLEDS::ORSITripe my shortsThu May 02 1991 14:3842
      	Re .5
    	What happened to you had nothing to do with ESD. And if you
    	did have 60 amps going through you, you would be dead. It
    	only takes 10 milliamps (.01A) to kill you. What you felt was
    	voltage, the real killer is the current. The reason you didn't
    	die is because there is isolation from direct contact with the
    	line by the transformer in the power supply.
    	   The most common problem musicians have is with 120VAC 60Hz.
    	If the PA is plugged into one outlet, and your amp into another,
    	but hot and neutral is swapped in one of them, it could mean that
    	your guitar strings may be HOT while the the metal case of the
    	mic is at gnd, or vice versa.
    	   Get one o' those AC outlet analyzers for $6 at Rat Shack
    	to test 3-pin outlets, or better yet, get a cheep RS multimeter.
    	Used correctly, it will tell you if there is a fault in the outlet.
	    In 2 and 3-pin outlet, the small slot should ALWAYS be hot, the
    	larger one, neutral. Measure each one to ground. Hot-to-gnd=120Vac,
    	Neutral-to-gnd=Less than 2Vac.
    	   Measure the voltage between the strings on your guitar and the
    	screen on the mic. If it reads more than 8V, you have a problem.
    	I've seen 120V readings from mic to guitar. Ray actually felt it.
    	Try the polarity switch on the amp, if it has one, and take another
    	reading. If the plug is the 2-wire kind, reverse it and measure again.
    	If the 2-wire plug has one prong wider than the other, it's a 
    	"polarized" plug. I've seen people cut the prongs down to fit, or use
    	an "adapter", but you may regret it.
    	   The problem with 2-wire plugs on your amp is that there is no
    	safety gnd and you don't know what the voltage potential of the
    	chassis is. In some old amps it's floating, in others, it's con-
    	nected to the neutral side, and if you reverse the plug, it now
    	becomes HOT, and if the mic is gnd....SEE YAAAAAAAAAA!!!
	   Oh yeah....a foam windscreen on the mic may work 'til it gets
    	moist from your breath, or you decide to adjust the mic stand, 
    	then.....GOTCHA!
    
    	Neal-who-learned-his-lesson
    
In 2 and 3-pin outlet, the small slot should ALWAYS be hot, the
    	larger one , neutral. Measure each one to ground. Hot-to-gnd=120Vac,
    	Neutral-to-gnd=Less than 2Vac.
    	   
2185.9more infoOTOA01::ELLACOTTpancake maverickFri May 03 1991 11:406
    re .3
    	Those wrist straps don't actually ground you. That would be
    dangerous!!!. There's actually a 1Meg resistor in the cable. It gives a
    high impedence discharge path for the static charges, as they usually
    don't have much stored energy, and keeps you safe from electrocution if
    you happen to touch live AC.
2185.10re: .-1GOES11::G_HOUSEMarshall Stack PukeFri May 03 1991 19:573
    It was a joke, man, a joke!   
    
    8^)
2185.11??FASDER::AHERBAl is the *first* nameSat May 11 1991 19:013
    Ive had that problem with a cordless system. I guess it had something
    to do with static
     
2185.12A STATIC SOLUTION HAS BEEN FOUNDFREEBE::LOUVATMon Jun 17 1991 15:4010
    Hey..thanks for all the feed-back on this E.S.D. problem...
    I found a solution to the problem.....Here in customer service we have
    these little kits to give to custmers to use on their terminals for a
    static problem. It's called "Staticide" and it worked great. I just
    wiped some on my scratch guard and LO AND BEHOLD...no more static pops.
    In fact, I've only done it once and there has been no further problems.
    Maybe in time it might start up again, at which time I nail it again
    with a dose of Staticide!!!!
                               
                                          Bill