Twisted Inductor - Resistor

Sep 14, 2003 0 Replies

I dug around in the garage and brought a couple old AA5 tube radio output transformers in to check with my AADE L/C meter. I found their secondaries to be a few tens of microhenries. But measuring the primaries gave me the 'Not An Inductor' message. This is not unexpected, since the L/C manual warns that power and audio transformers have a very low Q and will not measure at the higher freqs used by the meter. So no problem.



I took a couple 0.1% precision wirewound resistors made by Cinema and similar companies, and measured them with the L/C meter and came up with values in the several tens to a hundred microhenrys. Not unexpected I guess since there was no attempt to bifilar wind the wire to cancel inductance.



So there you have it: an inductor that thinks it's a resistor, and a resistor that thinks it's an inductor! :-P


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