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Old 15th September 2005, 08:51 PM   #1
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Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default The sound card impedance tester is here

discussed in the most recent edition of the ham radio magazine QST (with a more scientific discussion in QEX it's companion mag.)

The LMS test set uses a dual opamp to compare the voltage drop across an unknown impedance and an acurately known resistor. It is remarkably simple.

You can test inductors, capacitors, transformers, negative impedances, etc.

A PDF of the QEX article is available at www.arrl.org/qex/2005/Steber.pdf

the code can be downloaded at
http://www.arrl.org/files/qst-binaries/
just look about 1/3 down the page

you may need to run
VBRun60sp5.exe (availbable at Microsoft Downloads) if you get the error message "Required DLL file MSVBVM60.DLL was not found"

Jack

edit: I should have credited the author of the article -- Dr. George Steber, WB9LVI, Prof. Emeritus of EE at the University of Wisconsin, Milwaukee.
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