I recently came across Antique Electronic Supply through a half-hearted Google search for capacitor information, and I’m somewhat overwhelmed with the awesomeness.
They seem to be the StewMac of electronics, with a strong overlap with music-related products. They actually sell several of the same things that StewMac does, but in addition to that, they have a Tech Corner that contains things like a page for understanding the nuances of Potentiometers and Tone Capacitors.
Here are a few excerpts:
It’s useful to know the fundamental relationship between voltage, current and resistance known as Ohm’s Law when understanding how electric guitar circuits work. The guitar pickups provide the voltage and current source, while the potentiometers provide the resistance. From Ohm’s Law we can see how increasing resistance decreases the flow of current through a circuit, while decreasing the resistance increases the current flow. If two circuit paths are provided from a common voltage source, more current will flow through the path of least resistance.
On Tone Control:
The tone pot’s resistance is the same for all signal frequencies; however, the capacitor has AC impedance which varies depending on both the signal frequency and the value of capacitance as shown in the equation below. High frequencies see less impedance from the same capacitor than low frequencies. The table below shows impedance calculations for three of the most common tone cap values at a low frequency (100 Hz) and a high frequency (5 kHz).
And an interesting set of Potentiometer Taper Charts which makes me wonder what kind I bought. I’m assuming the linear taper is the one I would like the best, but I don’t really know.
The M and N Taper (Blend Balance) seems like it could be really interesting if you were able to use it in conjunction with coil-splitting to bring in the volume of the second single coil in the humbucker.
And if that weren’t enough, there’s a bunch of t-shirts with designs like this:
Greg, if you find you need more capacitors for your capacinator pedal, they seem to sell about 200 of them.