T.R | Title | User | Personal Name | Date | Lines |
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2185.1 | Snap, Crackle, Pop | IXION::ROST | Lobster in cleavage probe | Wed May 01 1991 10:09 | 8 |
| 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
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2185.2 | | GOES11::G_HOUSE | Marshall Stack Puke | Wed May 01 1991 11:42 | 4 |
| Getcha one of those field service wrist ground straps and hook yourself
up to the bridge.
;^)
|
2185.3 | | GSRC::COOPER | Major MIDI Rack Puke (tm) | Wed May 01 1991 11:50 | 3 |
| He's kidding folks... Bad idea if there is a bad ground anywhere...
jc (Who got lit up a few times...)
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2185.4 | | LEDS::BURATI | rih-bah...RIH-BAH! | Wed May 01 1991 12:14 | 6 |
|
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
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2185.5 | | PELKEY::PELKEY | YOIKES and AWAY!!! | Wed May 01 1991 13:42 | 10 |
| <<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^\
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2185.6 | | DNEAST::BOTTOM_DAVID | victim of unix... | Wed May 01 1991 14:09 | 10 |
| 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
|
2185.7 | Thanks for the tips | FREEBE::LOUVAT | | Thu May 02 1991 12:28 | 15 |
| 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...............
|
2185.8 | That ain't static | LEDS::ORSI | Tripe my shorts | Thu May 02 1991 14:38 | 42 |
|
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.
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2185.9 | more info | OTOA01::ELLACOTT | pancake maverick | Fri May 03 1991 11:40 | 6 |
| 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.
|
2185.10 | re: .-1 | GOES11::G_HOUSE | Marshall Stack Puke | Fri May 03 1991 19:57 | 3 |
| It was a joke, man, a joke!
8^)
|
2185.11 | ?? | FASDER::AHERB | Al is the *first* name | Sat May 11 1991 19:01 | 3 |
| Ive had that problem with a cordless system. I guess it had something
to do with static
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2185.12 | A STATIC SOLUTION HAS BEEN FOUND | FREEBE::LOUVAT | | Mon Jun 17 1991 15:40 | 10 |
| 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
|