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In Reply to: RE: ratio for interstage posted by Tubenstein on May 14, 2016 at 13:06:16
Here's a reference article that may shed some light on the current (smile) queries regarding impedance.
See especially the subsection titled resistance and reactance.
If you have access to an impedance analyzer you could measure the impedance at any given level or signal condition.
MSL
Builder of MagneQuest & Peerless transformers since 1989
Follow Ups:
That's a good reference Mikey, but it doesn't address the specifications of transformers. More important to this thread, it doesn't address how those specifications are defined or how they affect audio transformer application.
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Impedance is defined as the frequency domain ratio of the voltage to the current.[4] In other words, it is the voltage-current ratio for a single complex exponential at a particular frequency ω. In general, impedance will be a complex number". Wikipedia.
The definition of impedance was never in question. The discussion concerns the methodology used by manufacturers in creating specifications for transformers, and how those numbers relate to the operational impedance of the circuits in which those devices are intended to be used.
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Them cagey winders will never disclose that info. :+). JH
Subtle distinction - I'm pretty sure that transformer designers start from the specification (usually with a specific circuit in mind) and design the transformer to meet the specs.
Much of the transformer literature originated in the telephone business, where source and load impedances are matched to minimize reflections on long lines and to maximize the signal to noise ratio. In this context the design target impedance is a critical parameter. That was then, this is now. :^)
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