Handwinding Inductors

[har297]

Hi All,

In an attempt to complete my long pending 2 way Bookshelf's,which were run in a active 2 way till now because of missing passive crossover,
the last part was to build the passive crossover, i have already procured the enamelled wire and different sized bobbins, had a few doubts on the dimensions hence the this thread.

Is there any ratio (Length : Diameter) to be followed to make the inductors efficient ? or there wont be much differences in this ?

and regarding the values that i need, smallest will be 0.30 mH and Largest will be 1.9 mH

Thanks
Harsha

 

[all4music]

there are enough online calculators to calculate aircore inductor value . i recently got few of these coils wound though they were meant for power supply build in CLC circuit [each of them weight 1/2kg]. but later discovered the values were too low to be of any use for me !

couple of sites i used :

Pronine Electronics Design - Multilayer Air Core Inductor Calculator

Air Core Inductor Coil Inductance Calculator

PS: you should've bought wires after calculating based on above output

 

[har297]

yes, i had used below calculator for calculating the approx wire length required.
and had wound a few inductors for my earlier project, and seemed to be pretty accurate.

https://www.coilgun.info/mark2/inductorsim.htm

But while simulating the inductors, i saw that if we change the length of the coil, same Inductance was achieved by using shorter wire lengths and vice versa, So wanted to know if there is any ratio .

Thanks
Harsha

 

[all4music]

not sure if any ready ratio available, can't we make out by using first link from my post?