Resonance

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epilot

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hi friends,

can anyone help me to learn the "resonance" in electroncs theory?

i know soe thing about feedback but i am not sure how resonance phenomena happen in a transistor by feedback and amplifying the signal, and specially in "LC"s , i dont know,i have no idea

the resonance of a circuit depends on?

thanks
 
Resonance in a transistor circuit with feedback is a situation where the feedback is positive but not enuf to cause oscillation. This is tricky and can be unstable. In a practical circuit, there are phase shifting networks so the feedback in in phase for a narrow band of frequencies. Where the feedback is out of phase, the signal is attenuated..
 

i think it is better someone explain what is resonance phenomenon in electrincs, and why a circuit can not have a resonance more than what it has? does it depend on components nature or?
 
[
i think it is better someone explain what is resonance phenomenon in electrincs, and why a circuit can not have a resonance more than what it has? does it depend on components nature or?[/quote]

This does not make sense to me. Can you pose the question more clearly?
 
In simple terms resonance occurs in a tuned circuit when the capacitive reactance(XC) = the inductive reactance (XL).
So the frequency and the value of the inductor and the capacitor affect the
resonant frequency. It can also be calculated using the formula Fr=1/√LC.
Where the inductance is in henries and the capacitance is in farads.

The formula for inductive reactance is XL=2∏FL
The formula for capacitive reactance is XC=1/(2∏FC)

Resonance can occur in both series and parallel LC circuits.
 

Correction in red. This formula follows from the 2 quoted above. Let XL = XC and solve for F.
 
Last edited by a moderator:
It is too bad that Epilot can't explain the basis of his confusion, but we are just spinning our wheels here.
 
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