More than one frequency appearing in a circuit?

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Discussion Overview

The discussion revolves around the generation of multiple frequencies in an electrical circuit, particularly in the context of oscillation and resonance. Participants explore the components and configurations that can lead to the appearance of additional frequencies, including harmonics and other resonances.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the basic components or configurations that can cause additional frequencies to appear in an oscillating circuit.
  • Another participant asserts that non-linear components, such as diodes, are necessary for generating additional frequencies, typically harmonics.
  • A request for clarification on how non-linear components generate these frequencies is made, indicating a lack of understanding on the topic.
  • One participant mentions that capacitors and inductors can create additional resonances, potentially leading to oscillation at multiple frequencies simultaneously.
  • A specific circuit example is provided, involving a transformer with multiple secondary coils and diodes, where the participant observes an unexpected waveform and is uncertain about the mechanism behind the frequency generation.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of non-linear components for frequency generation, with some suggesting that linear components can also contribute to additional frequencies through resonance. The discussion remains unresolved regarding the exact mechanisms at play.

Contextual Notes

There are limitations in understanding the specific interactions between components in the described circuit, particularly regarding the role of resonance and the effects of the square wave input. The discussion does not clarify the mathematical relationships or dependencies involved.

hobbs125
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If a circuit is oscillated at one frequency what basic components (resistors, capacitors, inductors) or configurations of components can cause other frequencies to appear?
 
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None of the above, in order for more frequencies to be generated (usually harmonics) you need some non-linear component in the circuit; such as a diode.
 
Ok, can you explain how it happens? I've been trying to understand but I don't quite get it?
 
What kinds of other frequencies are you seeing. Are they harmonics of the fundamental or are they unrelated to the fundamental.

Both capacitors and inductors may create additional resonances and cause oscillation on more than one frequency at the same time. I've accidentally done that.
 
I think that may be what's happening. I've got a circuit which consists of a transformer with three secondary coils connected in series. The transformer is pulsed with a square wave. Each secondary coil has a capacitance in parallel which is the coils capacitance. The circuit is oscillated so the secondary coils are at resonance to limit current. Two of The coils have a diode between them which is forward biased during the on time.

The circuits purpose is to charge a capacitor to a high voltage while limiting current.

I'm actually getting an am waveform across the coils which leads me to believe the frequencies are close.
What I'm not understanding though is how it's occurring.
 
Last edited:

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