Post by thread:Coil Manufacture

Hi Does anyone have the formulae for building air core coils with an inductance value and finding the inductance from coil measurements. I know they exist but I can't find them! Cheers Tim ------------------------------------------------------------------ Personal Web Pages: http://web.ukonline.co.uk/members/tim.kerby/ Email: spam_OUTtim.kerbyTakeThisOuTukonline.co.uk ------------------------------------------------------------------

Tim et.al., I'm sure that everyone in the world jumped on this easy one. For the approximate inductance of a single-layer air-core coil L (uH) = ( d*d*n*n )/(18d + 40*l) where L = inductance in microHenries d = coil diameter in inches l = length of coil in inches n = number of turns Someone has already come up with an inductance meter and capacitance meter using a PIC with an LCD display. See http://www.mtechnologies.com/mthome for discription and info. Meter is made by AADE (Almost All Digital Electronics). FYI Chuck Adams K5FO CP-60 .....adamsKILLspam@spam@sgi.com http://reality.sgi.com/adams/index.html

Tim Try the Raido Amatures Handbook (RSGB) there is lots of stuff in there about coils ect mainly for RF but unless you are using litz wire for skin effect then I suppose the fourmula will work. Steve.....

Tim, check out the ARRL Handbook--its a ham radio publication that would explain how to do the calculations in detail. If you can't find one, send me a personal e-mail and I will e-mail you the info. Mike, WB8ICN ************************************* {Quote hidden}>Hi >Does anyone have the formulae for building air core coils with an >inductance value and finding the inductance from coil measurements. I know >they exist but I can't find them! > >Cheers > >Tim > > >------------------------------------------------------------------ >Personal Web Pages: http://web.ukonline.co.uk/members/tim.kerby/ >Email: tim.kerbyKILLspamukonline.co.uk >------------------------------------------------------------------ >

I have a small VB program that calculate the inductance of an air core coil. Coil size must be expressed in millimeters ( length, diameter, turns). Slides are provided to vary easily your input by 1% steps. I can send you the exe if you want it. (8.10K) As i recall, to get maximum inductance you must stick to this physical proportion( length = diam/2). Jean