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MECA Electronics Attenuators

Single Layer Coil Design Chart
March 1955 Popular Electronics

March 1955 Popular Electronics

March 1955 Popular Electronics Cover - RF CafeTable of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from Popular Electronics, published October 1954 - April 1985. All copyrights are hereby acknowledged.

articles from Popular Electronics.

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, March 1955 Popular Electronics - RF Cafe

Single Layer Coil Design Chart

 

 

 

 

Posted April 16, 2013

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