# Thread: Measuring pickups Capacitance?

1. Is a tall, thin coil conducive to capacitance, while a short, fat coil is not?
Yes, this is a general principle. Short, fat coils have more layers than thinner, longer coils with a similar number of turns. This keeps inner and outer windings farther apart thus reducing distributed capacitance.

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2. Originally Posted by Helmholtz
Yes, this is a general principle. Short, fat coils have more layers than thinner, longer coils with a similar number of turns. As a consequence the partial voltage between layers is lower and the total voltage spreads over more layers. Another way to view this is that short, flat coils keep inner and outer windings farther apart thus reducing distributed capacitance.
So greater distances between portions of coil lowers capacitance; a tall, thin coil also puts a lot of distance between the top-most and bottom-most winds, so are you saying that you get less capacitance with the short-flat coil because the starting winds and the ending winds are set farther apart, as opposed to placing the winds-per-layer farther apart?

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3. So greater distances between portions of coil lowers capacitance; a tall, thin coil also puts a lot of distance between the top-most and bottom-most winds, so are you saying that you get less capacitance with the short-flat coil because the starting winds and the ending winds are set farther apart, as opposed to placing the winds-per-layer farther apart?
Yes, it can be shown that the partial capacitances between adjacent turns having larger voltage difference contribute most. The direct neighboring turns within the same layer almost have the same voltage, so their contribution is small. The contribution of the capacitances between neighboring layers is much stronger.

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