[sdiy] Calculating cable capacitance effect

Bernard Arthur Hutchins, Jr bah13 at cornell.edu
Mon Apr 19 02:05:31 CEST 2021


CheaterCheater asked:
“Really interesting - why does the DC shift happen?”

Orin Replied correctly:

“Asymmetric high frequency MHz oscillations can appear as "DC" offsets - sorta like low pass filtered PWM.”



Bernie adds:

Making a good sinewave oscillator (directly - not waveshaped) is skilled engineering.  Spurious oscillations are generally “accidental” and full of harmonic, including harmonic zero (DC). If I recall correctly, this one looked like a sequence of inverted U’s.







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