[Lowfer] I need the formula to calculate needed turns on a coil

[EVP]

   Better remember that this will give you the wrong 
answer!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! This procedure is fine for a 
high permeability toroidal core but not for a solenoid.  Reason is that 
the inductance goes down with the length as shown in the simple form of 
Whee'er's formula someone quoted.  That equation will give pretty 
accurate [better than a couple of percent] for coils with a 
length/diameter ratio between about 0.5 amnd 2, which probably covers 
your situation.

Eed


Warren Ziegler wrote:

>Paul, Andy,
>
>  
>
>> You can
>>wind 10 turns and check that then wind whatever mulitple of 10 turns to
>>get the 2500 uh you want.
>>    
>>
>
>    Remembering of course that inductance goes up with the square of
>the turns count so 20 turns will have 4x the inductance of 10 turns.
>
>  
>