Resonance - Electronic Circuits Projects Diagrams Free

epilot · 7th February 2006, 09:19 PM

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

ljcox · 7th February 2006, 09:35 PM

I explained resonance to someone in this thread.

http://www.electro-tech-online.com/v...ight=resonance

If you need further help, please feel free to ask more questions.

Russlk · 7th February 2006, 09:50 PM

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..

epilot · 7th February 2006, 10:57 PM

Quote:

Originally Posted by ljcox

I explained resonance to someone in this thread.

http://www.electro-tech-online.com/v...ight=resonance

If you need further help, please feel free to ask more questions.

thanks,but it was a thread about filters,inductors
there was no info about resonance,

what i could learn in that thread is taht i will have a big chalenge with Laplace at university :lol:

epilot · 7th February 2006, 10:58 PM

Quote:

Originally Posted by Russlk

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?

Russlk · 8th February 2006, 01:33 AM

[
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?

zachtheterrible · 8th February 2006, 02:29 AM

A little search turned this up, hope it's helpful.

http://www.electro-tech-online.com/v...ight=resonance

k7elp60 · 8th February 2006, 03:34 AM

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.

akg · 8th February 2006, 04:52 AM

will this do.?
http://en.wikipedia.org/wiki/Electrical_resonance
http://mail.sci.ccny.cuny.edu/~physd.../resonance.pdf

ljcox · 8th February 2006, 10:09 PM

Quote:

Originally Posted by k7elp60

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=1/2∏ √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.

ljcox · 8th February 2006, 10:10 PM

Quote:

Originally Posted by epilot

Quote:

Originally Posted by ljcox

I explained resonance to someone in this thread.

http://www.electro-tech-online.com/v...ight=resonance

If you need further help, please feel free to ask more questions.

thanks,but it was a thread about filters,inductors
there was no info about resonance, Yes there is.

what i could learn in that thread is taht i will have a big chalenge with Laplace at university :lol:

Russlk · 9th February 2006, 02:49 AM

It is too bad that Epilot can't explain the basis of his confusion, but we are just spinning our wheels here.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

7th February 2006, 09:19 PM	(permalink)
epilot	Resonance 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

7th February 2006, 09:35 PM	(permalink)
ljcox	I explained resonance to someone in this thread. http://www.electro-tech-online.com/v...ight=resonance If you need further help, please feel free to ask more questions. __________________ Len

7th February 2006, 09:50 PM	(permalink)
Russlk	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.. __________________ see my website: www.geocities.com/russlk

8th February 2006, 01:33 AM	(permalink)
Russlk	[ 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? __________________ see my website: www.geocities.com/russlk

8th February 2006, 02:29 AM	(permalink)
zachtheterrible	A little search turned this up, hope it's helpful. http://www.electro-tech-online.com/v...ight=resonance __________________ I'm no electronics god, i just talk too much.

8th February 2006, 03:34 AM	(permalink)
k7elp60	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. __________________ The great thing about electronics is unlimited ways to do the job. The only limit is one\'s imagination. I generally think my way is best. Show me a different way. I have an open mind.

8th February 2006, 04:52 AM	(permalink)
akg	will this do.? http://en.wikipedia.org/wiki/Electrical_resonance http://mail.sci.ccny.cuny.edu/~physd.../resonance.pdf

9th February 2006, 02:49 AM	(permalink)
Russlk	It is too bad that Epilot can't explain the basis of his confusion, but we are just spinning our wheels here. __________________ see my website: www.geocities.com/russlk