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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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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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