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Building Valve Amplifiers, 2nd Edition by Morgan Jones

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Appendix

Two-terminal modelling equations and spreadsheets

Whether we measure a capacitor, explicit inductor or a transformer winding’s leakage inductance, we are simply measuring the impedance of a combination of components between two terminals. We imply a model the moment we assign LCR component values to that impedance. Modelling accuracy invariably breeds model complexity, so this section aims to show you how to create and test spreadsheet models ranging from simple to complicated with an absolute minimum of pain.

Once we have a mathematical model of a component’s impedance, a spreadsheet can very easily calculate impedance at many different frequencies, plot the results as a graph of impedance against frequency, and overlay measured impedance ...

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