I just came across this spice diagram provided by Vasik ( https://www.overunityresearch.com/index.php?topic=4227.msg97375#msg97375 ).  If you know electromagnetism, you should be very very surprised. How could a generator feeding linear elements like capacitors or inductors, with a single sinusoidal frequency, give rise to signals of different frequencies? Since a model is based on a mathematical treatment and this is mathematically impossible in the formalism of electromagnetism, it is therefore a problem of the model. The real realization of this setup will not show any beats. This kind of anomaly is due to the choice of the time step. The default time step in LTspice is often too large when a resonance frequency of a circuit is close to, but different from, the generator frequency. I already had this case in my simulations. But I thought about it rather than publishing the miracle picture of the fairy tale because I prefer understanding to grandstanding. And by reducing the time step to 0.1 µs, the beat disappears. The only difference between the left and right simulation is the time step. There is a total correspondence between the representation of a signal in the time domain and in the frequency domain. If your time step is 10% of the signal period, you cannot differentiate frequencies that are less than 10% apart. As LTspice introduces noise, it introduces signals with different frequencies which become very visible if the time step is badly chosen because it is too large. Those who are satisfied with a mediocre knowledge of electromagnetism because they think they are smarter than the physicists who found the laws of electromagnetism, are condemned to see anomalies and free energy everywhere they are not, and conversely when there is really some in their setup, they will not see it. "Chance favors only the prepared mind". If only they would remain discreet, but the less they know, the more they want to impress us with their pseudo-discoveries.
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"Open your mind, but not like a trash bin"
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Topic: Artifacts in simulations (Read 635 times)
