Using Resistors In Guitars – 101

When you think of tone shaping, a couple of items might come to mind. We all use pickups, capacitors (tone caps), and pots as tone shapers. All the above are powerful in their ability to shape how your guitar acts. Yet, some people don’t understand the potential of one of our most important tools: Resistors.
 
Resistor is a device with a measurable amount of resistance. Simply put, a Resistor impedes the flow of, or “resists” electricity. One way to think of a resistor is using the ‘Pipe analogy’.
 
Imagine a pipe with free flowing water in it. Then, imagine the water has to go through a much smaller gauge pipe where the flow is being “resisted”. This is similar to how a resistor works: it creates a higher point of resistance in the flow of electricity.
 
I’m sure you’re thinking “Cool. But, how does that translate to my guitar?” We’re glad you asked! Today, we’re going to illustrate some basic examples of how resistors can shape your tone.

Partial Split Resistor:

One of the most basic uses of a resistor is in our Partial Tap Kit. The Partial Split Resistor gives low-output humbuckers a stronger single-coil tone when split. This is a common problem when splitting your humbucker – not all humbuckers are equal. Removing one coil from a lower-output humbucker, like our Pure P.A.F., leaves you with a weak-sounding single coil tone. Using a resistor can make all the difference. For an in-depth article on coil-splitting, head to our article here.

How to wire it up:

Using a Partial Tap Resistor is easy. It takes the place of whatever you’re using to connect to ground. Instead of using a wire as your ground connection, use a resistor instead. This will give you a stronger coil tapped tone when you pull up. See below for an illustration to help you wire it up.

Lindy Fralin's Partial Tap Resistor

 

How It Works:

Simple. A Resistor is “Resisting” the flow of electricity, so, when you pull up, instead of sending 50% of the Humbucker to ground, it will only send, say, 33% of it. This allows you to have a stronger single coil tone when pulled up.


Faking Out Your Single COils With Resistors:

Alright “faking out” seems a little vindictive. However, when you have a Telecaster with a Humbucker in the Neck and a Single Coil in the bridge, it can be really hard to make those two pickups play nicely together (read our in-depth article on this topic here).

When to Do It:

Let’s set the stage: You have a Telecaster with a Humbucker in the neck and a Single Coil in the Bridge. The Humbucker needs a 500K pot to sound good, and the Single Coil needs a 250K pot to sound good. You only have one volume pot – how can you compromise? Put a Resistor From The Bridge Pickup Hot To Ground.

How To Wire It Up:

 

Lindy Fralin Pickups Using a Resistor In A Telecaster

How Does It Work?

Let’s explain this using a simple formula. When two resistors are used in Parallel, one side of the resistor is connected to the same location. For example, your Volume Pot is a resistor: 250K, 500K, these are resistance values. One side of the pot is a “hot”, or “input”, and one side of the pot is Ground. If you attach a resistor from the “Hot” of a pickup, and one leg to “ground”, you’re putting that resistor in Parallel. See below for the equation of using 2 Resistors in Parallel:

As you see, if you put a 500K resistor in Parallel with a 500K pot, the Bridge Pickup will “see” a 250K pot. This is great for your Telecaster as it you’ll have a great sounding Neck Humbucker and a perfect-sounding Bridge Single Coil.

Note:

The above formula works perfectly when you’re on your Neck pickup and Bridge Pickup only. However, when you get in the Middle Position, you’re adding yet another resistor. Your Neck Pickup (500K) Your Bridge Pickup (500K) and the Parallel Resistor (~470K). When you combine your neck and bridge together using this resistor trick, the middle position will see a 163K pot, making it darker than normal. 


Transform Your Pots:

In our last example, you can use a resistor to change your pot value. This is handy when you only have a 500K pot on hand, but you need a 250K pot. If you have a ~500K Resistor, you can make this happen! See below for a diagram on how to wire this up:

Lindy Fralin Pickups: Resistor In Parallel

In the above image, you have a 470K resistor in Parallel with your Volume Pot. The pot value’s resistance is 500K, and your Resistor is 470K – with a combined resistance of 242K. Pretty neat! You can use this trick to take a bit of high-end off of your pots as well. Let’s say you have a 500K pot, and your pickups are just a little too bright on them: you can add a 1K resistor like the image above, and you’ve turned your 500K pot into a 333K pot. This will tame some of the highs.


Thanks for reading. There are lots of great articles out there to learn how resistors work, and what they are used for.  There are a multitude of ways to add a resistor to your guitar’s kit. How do you do it?

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