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Pi Day has been and gone for this year but I can't resist doing one more very simple electronics experiment. I'm going to do it quickly, without a great deal of precision, simply to look at the basic ideas involved. If you want to see it done better,…

Somewhere on the front panel of almost any oscilloscope is a "Cal" reference signal output (Figure 1). That signal is really intended for adjusting the capacitance compensation screw to calibrate a 10X high-impedance probe, but most of us know it simply…