There can only be 500k resistance between lug one and lug three when using a 500k pot, and both potentiometers in our circuit have a path to ground. There is always a physical connection between all three lugs, and the most resistance that can separate them is the value of the pot. If you look at Example 2 again, you might notice one more thing about the potentiometer. Less leaking means more highs and a brighter tone. The further the wiper is from point C, the more resistance will prevent the signal from leaking through the capacitor.
The closer the wiper is to point A, the more signal can escape through the center lug and travel to the output jack.It enters the volume at lug one near point A. The signal comes from the pickup and goes to the volume and the tone. Now, if we look back at Example 1, we can understand the circuit a little better. The resistance between point C and the wiper is less than 250k.The resistance between point A and the wiper is more than 250k but less than 500k.The resistance between point C and point B is 250k.The resistance between point A and point B is 250k.The resistance between point C and point A is 500k.The resistance between point A and point C is 500k.The center lug is the wiper, which you move by turning the volume or tone control up or down. The resistance track runs from Lug 1 to Lug 3. In Example 2, you can see the inner workings of a standard potentiometer. Let’s see what’s happening inside a potentiometer, by looking at Example 2. The signal can then go through the volume to the output jack, or it can go through the tone control to the ground. You can see in Example 1 that the signal comes from the pickup and goes to the volume. Humbuckers and single coils use the same layout.
Let’s look at the basic single pickup wiring diagram in Example 1. The difference in potentiometer values contributes to this sound difference. Single-coils are known to tend toward shimmery, harsh, or piercing tones. This phase cancellation causes humbucker pickups to lose their high frequencies and sound much warmer as a result than single coils. Humbucker pickups are subject to phase cancellation because the two coils are close to each other. The important difference between single-coils and humbucker pickups is their sound. Unfortunately, while this might be a great way to remember the correct values to use with each type of pickup, it’s not the reason we use those values. I’ve found that many people believe that we use 500k for the humbuckers and 250k for the single-coils because humbuckers use two coils, put out more power, and therefore require the 500k pot. These things will change the sound very little, and in most cases, the only one that will notice the difference is you. If you already have the tone you want, and you just want to polish it up a little, we recommend looking at the bridge and nut materials, the capacitors, and the potentiometer values.The sound of new pickups is unmistakable, and if you have stock pickups in a budget guitar, they can turn it into a new instrument. If you want to improve your tone, we recommend making sure you set your guitar up correctly, then looking into new pickups that produce the sound you want.Changing any of those, however, will not affect the sound nearly as much as a good set of pickups. There are a lot of other factors - like string gauge, wood type, nut and bridge materials, capacitors, and age - that affect your tone. Whether you use single-coils or humbuckers, most of your tone comes from the pickups. We’ll talk about why we use these values and how they affect the guitar circuit and your tone. Let’s take in-depth look at mixing 250k and 500k ohm potentiometers. The standard convention is to use 500k pots when you use humbuckers and 250k pots when your guitar has single-coil pickups, but what would happen if you switched the values, or used one of each? One of the most common questions we get has to do with selecting the correct value for the volume and tone controls.
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