Single layer coil design charts (aka nomographs) are a dime a dozen on the Internet. Here is RF Cafe's 0.083¢ contribution. A couple examples of usage are included. You're welcome. Single Layer Coil Design Chart This chart can be used to find inductance of a coil when dimensions and number of turns are known, or to find specifications to give a desired Inductance. Draw a line between either T and L or d and *l*/d, whichever are both known. Draw a second line between remaining known quantity and point of intersection of first line and unmarked vertical line. Extend second line to scale for unknown quantity and read answer. EXAMPLE A: We have a coil 5" in diameter, 19 turns, 37 turns per inch, and wish to find the inductance. *l *= 19/37" = .52"; *l*/d = .52/5 = .104. Draw a line between d=5 and *l*/d = .104. Draw a second line from T = 37 through the intersection point to the L scale. Read the answer, 100 microhenries. EXAMPLE B: We require the number of turns of a coil 5" in diameter, wound 37 turns per inch, to give 100 microhenries. Draw a line between T = 37 and L = 100. Draw a second line from d = 5, through the intersection point, to the *l*/d scale, and read *l*/d = .104. Then *l* = 5 x .104 = .52 Inches. The number of turns is .52 x 37 = 19, approximately.
**Single Layer Coil Design Chart**
Posted April 16, 2013 |