DIY driver - estimating Le

el`Ol · 4th December 2007, 02:12 AM

Hello all!

I want to build a driver and I don´t know how to estimate the voice coil inductance. I guess the inductance goes up a lot when the coil is sitting in the air gap.
And how do I calculate the impedance curve when I have Le?

Regards,
Oliver

Michail Bugaria · 4th December 2007, 08:50 AM

Hi

It is necessary to measure the impedance plot directly so-as it comprises already the information about Le. But not on the contrary.

el`Ol · 4th December 2007, 09:43 AM

It would be nice to estimate the impedance rise before winding the coil.

el`Ol · 5th December 2007, 06:44 AM

Meanwhile I think the impedance rise is not the most important point when I want to estimate the treble extension. All pistonic drivers seem to have a sudden 20dB rolloff, even those with neglectable voice coil inductance. Does anybody know the formula to calculate this cutoff frequency? I hope this formula doesn´t contain Rms, since this is impossible for me to estimate.

4th December 2007, 02:12 AM	#1
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	DIY driver - estimating Le Hello all! I want to build a driver and I don´t know how to estimate the voice coil inductance. I guess the inductance goes up a lot when the coil is sitting in the air gap. And how do I calculate the impedance curve when I have Le? Regards, Oliver

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4th December 2007, 08:50 AM	#2
Michail Bugaria diyAudio Member Join Date: May 2006	Hi It is necessary to measure the impedance plot directly so-as it comprises already the information about Le. But not on the contrary.

4th December 2007, 09:43 AM	#3
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	It would be nice to estimate the impedance rise before winding the coil.

5th December 2007, 06:44 AM	#4
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	Meanwhile I think the impedance rise is not the most important point when I want to estimate the treble extension. All pistonic drivers seem to have a sudden 20dB rolloff, even those with neglectable voice coil inductance. Does anybody know the formula to calculate this cutoff frequency? I hope this formula doesn´t contain Rms, since this is impossible for me to estimate.

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