1mH - 3mH inductor with low DC resistance (around1.5 ohms)

[niks]

hi
i need 1mH - 3mH inductor with low DC resistance . approximatly it should be below 1.5 ohms. If anyone know where it is available please let me know asap. its very urgent.
thanx
regards
Nikhil

 

[echo47]

how to make a 1mh inductor

DigiKey sells various toroid power inductors. Try their "fixed inductor" search form:
h**p://www.digikey.com/scripts/us/dksus.dll?Criteria?Ref=22038&Cat=30147262

 

[KaSpeR]

how to make 1mh inductor coil

Make sure you observe the DC current rating of the inductor. Alot of these small surface mount inductors and others have hardly any inductace when large DC currents are being passed through them. Decoupling inductor or tuning inductor.
Q may be of importance, just a reminder...........

 

[penrico]

1 mh coil

Take a look at 3LCoil, there`re too much inductors

 

[bimbla]

inductors 1mh

20 Turns of 18guage wire on a 2W resistor will give you a near about value.

bimbla.

 

[Pingy]

coil of 1mh

Hi All,

I think bimbla is right in the sense that it is not too difficult to make a 1mH
low resistance coil but I would expect a much higher number of turns.
I could be wrong but in the past I made several coils for loudspeaker
crossovers and they had many more than 20 turns for a 1mH inductance.

If you want to try here is the formula I used:

L {uH} = 31.6 * N^2 * r1^2 / (6*r1 + 9*L + 10*(r2-r1))

L{uH} = Inductance in microHenries
N^2 = Total Number of turns on coil Squared
r1 = Radius of the inside of the coil {meters}
r2 = Radius of the outside of the coil {meters}
L = Length of the coil {meters}



Pingy