reverse calculate inductance

Wamba-lam · 27th July 2007, 04:12 PM

I have a PA cab that i like which is no longer in production . I want to build a couple more.

I have found drivers that are replacement parts for this model but now i need another crossover or 2.

I have tried a couple of off the shelf XO's and i like this old one better.

I have the caps i need but the inductors arent marked.

Can i get a Capacitance/Inductance meter and measure "In Circuit"?

Wamba-lam · 27th July 2007, 04:52 PM

Sorry for the misleading title. I was originally going to ask if i could get inductance figures by plugging cap values and XO frequency into a crossover calculator and get the values i need.

Pano · 27th July 2007, 07:38 PM

I think you could only calculate the inductor value if you really know the frequency and it's a textbook design and you know the filter type.

Some clever person here may be able to tell you how to test the values in circuit, but I would just desolder a leg and measure with an inductance meter.

That isn't much help, is it?

27th July 2007, 04:12 PM	#1
Wamba-lam diyAudio Member Join Date: Jul 2007	reverse calculate inductance I have a PA cab that i like which is no longer in production . I want to build a couple more. I have found drivers that are replacement parts for this model but now i need another crossover or 2. I have tried a couple of off the shelf XO's and i like this old one better. I have the caps i need but the inductors arent marked. Can i get a Capacitance/Inductance meter and measure "In Circuit"?

27th July 2007, 07:38 PM	#3
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	I think you could only calculate the inductor value if you really know the frequency and it's a textbook design and you know the filter type. Some clever person here may be able to tell you how to test the values in circuit, but I would just desolder a leg and measure with an inductance meter. That isn't much help, is it? __________________ Take the Speaker Voltage Test!

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27th July 2007, 04:52 PM	#2
Wamba-lam diyAudio Member Join Date: Jul 2007	Sorry for the misleading title. I was originally going to ask if i could get inductance figures by plugging cap values and XO frequency into a crossover calculator and get the values i need.

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