WMcD Posted March 17, 2010 Share Posted March 17, 2010 Attached in an article (in a .zip file) about measuring speaker impedance without a bridge. It will require a test resistor of known (measured) value of about 8 to 16 ohms, an amplifier (such as we all have) a sine generator (there are many around for use on computers) and an a.c. volt meter. There is a bit of math involved and thus I've set up a spreadsheet in the .zip file. People with some knowledge of spreadsheets will know how to copy the main row for the three measurements at various frequencies. And make a graph. You will see that the article uses an equation to calculate the value of an equivalent inductor. It seems to me you can use the set-up to determine the value of an unmarked inductor. Just put that in place of the speaker. Also, you could use it to measure the value of an unmarked capacitor. I've added that equation. I have not had an opportunity to try this. Maybe several of us can make it a project for the forum. Wm McD Measuring Speaker Impedance Without a Bridge.zip Measuring Speaker Impedance Without a Bridge.zip Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted March 17, 2010 Share Posted March 17, 2010 Thanks for posting this Gil. I glanced at the article and I am currently doing something similar in terms of the test rig. This is interesting about decompoing the resistive and reactive components using the the same, simple rig. Quote Link to comment Share on other sites More sharing options...
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