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Subject: Need formulae for small coils

Date: 01/02/00
Posted by: Charlie Ross
E-mail: brm(at)ils(dot)net(no spam)
URL: http://


I am looking for a formula that will allow for a change in the diameter of the coil while still retaining the same inductance. ie. some other part of the equation will have to change, like the number of turns. The original coil is about 7/8" inch in diameter and about 1/16" high, multiple windings. (from a digitizing pads' CAD puck). I can borrow a meter with inductance to get the original coil's value. I want to make a coil of about 3/8" in diameter, height and turns can be altered, but it has to work the same in circuit. I don't have any ham radio books which apparently have those formulae. Thanks, Charlie.

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