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Yesterday, 03:20 PM  #6861 
worlds biggest ego
Join Date: May 2006
Location: NC

please, Jim, teach me your ways.
Is that resistor going to go through the hot, or the ground?
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Gear: Guitars: BC Rich Warlock Dean 88 ME682In Progress Amps: Carvin SX300 Etc: Clayton 1.0mm picks Planet Waves cables. 
Today, 01:49 AM  #6862  
Jim'll fix it.
Join Date: Aug 2005
Location: In the Chamber of Understanding

Technically it doesn't matter but conventionally it would be in the hot side so that goes: hot wire>resistor>EL strip>neutral wire.
As for the math, it's just Ohm's Law and Watt's Law. Here is a PIRE wheel: It tells you all the combinations of Ohm's and Watt's Law equations. Note that the pic uses W instead of P for the power terms. Most people use P so I will as well. We know that the thing uses 100v and 0.5W at most and we need to know its resistance and current to be able to figure the series limiting resistor. Looking at the R quadrant we see that R=E^2/P. The square of 100 is 10,000. 10,000/0.5=20,000. So the EL strip has a resistance of 20k ohms. To find the current draw, we look at the I quadrant and see that I=E/R. 100/20,000=0.005A or 5ma. If you draw a series circuit of two resistors across a 120v supply and fill in all the known values for the resistors it helps a ton. Unfortunately I can't do that here so I'll make a list. R1 is the EL strip and R2 is the limiting resistor. R1: I=0.005A R=20,000 ohms E=100v P=0.5W R2: I=0.005A (only one current can flow in a series circuit) R=??? E=20v (the supply is 120v and 100 of that is already used by the EL strip) P=??? Now we need to find the resistance of and power dissipated by the limiting resistor R2. Since we know the voltage and current already we look at the R quadrant and find that R=E/I. 20/0.005=4000 ohms. 3900 is the nearest standard or you could use 4200 for a bit of an extra safety margin. Looking at the P quadrant tells us that P=I*E so 0.005*20=0.1W or 100mW. You should always try to use at least double the calculated wattage so a standard 0.25W resistor is plenty. Make sense?
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Today, 05:36 AM  #6863 
Registered User
Join Date: Jan 2013

Hi,
if anyone could tell me ever part I need to completely rewire my Gibson Les Paul Studio 2013, I'd be more than grateful. Basically I want to get rid of the PCB design, and install 50's wiring. Preferably something similar to Slash's setup (I know..). Only got the single wire pickups so I just need what? Pots, caps and what else? I plan on doing the work myself this time, so I just need help ordering the replacements. EDIT: Would this set do? http://www.thomann.de/fi/montreux_8...iring_kit_3.htm I currently have the pushpull knobs but I don't use them since I don't plan on using push/pull pickups. Last edited by Izvire : Today at 05:40 AM. 
Today, 08:16 AM  #6864  
Jim'll fix it.
Join Date: Aug 2005
Location: In the Chamber of Understanding

That set will do but you'll be wasting your money on those audiophile tone caps. Plain old film or ceramic is a lot cheaper and will sound exactly the same. You'll save a crap load of money if you order the parts yourself rather than buying a kit like that. Their price is crazy.
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Today, 03:50 PM  #6865 
worlds biggest ego
Join Date: May 2006
Location: NC

Yea, it makes sense. I really appreciate the detailed explination. Now, all theres left to do is make flashy lights happen.
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Gear: Guitars: BC Rich Warlock Dean 88 ME682In Progress Amps: Carvin SX300 Etc: Clayton 1.0mm picks Planet Waves cables. 
Today, 05:04 PM  #6866  
Registered User
Join Date: Sep 2009

Quote:
69€ for parts worth max. 10€. . Take a look at ebay, you'll find 500k potis for ~1€ each. The other parts are very low cost too. 

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