series components in crossover

REALFLEO · 27th December 2006, 06:29 PM

Hi all,

I'm realizing my first project and I'm wondering if I shou;d use series inductor, capacitor and resistance to achieve calculated values for a audio crossover ?

I'm asking that because it's almost impossible to buy components that have the exact calculated values...

Thanks,

REALFLEO

Lionel · 27th December 2006, 08:31 PM

1 - you can add capacitors' values by putting them in parallel
2 - you can unwire inductors to match the desired values.
Lalena calculator
3 - for resistances place in parallele use the formula R = (R1 x R2) / (R1+R2)

lndm · 27th December 2006, 08:59 PM

Rounding to within 5% is not unreasonable, even 10% is sometimes OK. If you also consider that calculated values are not always perfect for the job, it makes practical sense to initiate your crossover with the nearest available values, and tweak from there.

REALFLEO · 27th December 2006, 09:01 PM

Can I use inductors in series like capacitor to match calculated values or it's better to take a bigger one an unwire it like u said ?

Thanks,

REALFLEO

Lionel · 27th December 2006, 09:14 PM

Quote:

"Rounding to within 5% is not unreasonable"

Quote:

Can I use inductors in series like capacitor to match calculated values or it's better to take a bigger one an unwire it like u said ?

Yes you can but it's much more expensive and not very elegant !!!

REALFLEO · 28th December 2006, 03:29 PM

Ok thanks for your posts guys

REALFLEO

lndm · 28th December 2006, 09:53 PM

One of the common concerns with inductors is their DC resistance. In some parts of a crossover this really is not a problem but where it is, this can be a reason for purchasing a quality coil.

If you look at one 1mH inductor alongside two 0m5H's in series, the DCR should be higher for the pair (assuming all three were wound with the same gauge of wire). Therefore, having all the windings on the same form can increase the effect and reduce the wire used.

This also means that two 2mH inductors in parallel should have a lower DCR than the 1mH on its own. Of course the problem of cost and of interaction and the inelegance make purchasing a more expensive 1mH to start with the better option.

If it helps, I have been known to use much larger values of inexpensive iron cored inductors in parallel in order to tweak values during testing.

27th December 2006, 06:29 PM	#1
REALFLEO diyAudio Member Join Date: Nov 2006	series components in crossover Hi all, I'm realizing my first project and I'm wondering if I shou;d use series inductor, capacitor and resistance to achieve calculated values for a audio crossover ? I'm asking that because it's almost impossible to buy components that have the exact calculated values... Thanks, REALFLEO

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27th December 2006, 08:31 PM	#2
Lionel diyAudio Member Join Date: Jan 2004 Location: Saint Etienne	1 - you can add capacitors' values by putting them in parallel 2 - you can unwire inductors to match the desired values. Lalena calculator 3 - for resistances place in parallele use the formula R = (R1 x R2) / (R1+R2)

27th December 2006, 08:59 PM	#3
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	Rounding to within 5% is not unreasonable, even 10% is sometimes OK. If you also consider that calculated values are not always perfect for the job, it makes practical sense to initiate your crossover with the nearest available values, and tweak from there.

27th December 2006, 09:01 PM	#4
REALFLEO diyAudio Member Join Date: Nov 2006	Can I use inductors in series like capacitor to match calculated values or it's better to take a bigger one an unwire it like u said ? Thanks, REALFLEO

28th December 2006, 03:29 PM	#6
REALFLEO diyAudio Member Join Date: Nov 2006	Ok thanks for your posts guys REALFLEO

28th December 2006, 09:53 PM	#7
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	One of the common concerns with inductors is their DC resistance. In some parts of a crossover this really is not a problem but where it is, this can be a reason for purchasing a quality coil. If you look at one 1mH inductor alongside two 0m5H's in series, the DCR should be higher for the pair (assuming all three were wound with the same gauge of wire). Therefore, having all the windings on the same form can increase the effect and reduce the wire used. This also means that two 2mH inductors in parallel should have a lower DCR than the 1mH on its own. Of course the problem of cost and of interaction and the inelegance make purchasing a more expensive 1mH to start with the better option. If it helps, I have been known to use much larger values of inexpensive iron cored inductors in parallel in order to tweak values during testing.

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