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Old 15th March 2014, 02:36 PM   #31
diyAudio Member
Join Date: May 2011
Location: Silicon Valley
mcandmar, I recommend you connect a fixed inductor whose inductance is known within 10%, to Cheapomodo. Then calculate the ideally perfect Rs value which gives zeta=1.000 (at this L and this Cx) using the equation in Appendix A. Set your potentiometer to this Rs value. Look at the CheapoModo waveform on your scope; at the ideal perfect zeta=1.000, your scope trace is not a flat line. The goal is not to achieve a flat line, the goal is to achieve zeta=1.000. The ideal perfect scope waveform for zeta=1.000 is shown in post #143 of the Quasimodo thread, and in several Figures of the design note.
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