How do i measure the cutoff point?

how do i measure the rolloff?

How do i measure the critical point?

Is butterworth,bessel,Chebyshev just different rolloff , and critical points ?
Whats the difference between these?

Does butterworth,bessel,Chebyshev have different resonance frequency?
and different phase angles/degrees?

Whats the different phase angles/degrees from each of these butterworth,bessel,Chebyshev?

 

Some basic descriptions can be found here.

http://www.filter-solutions.com/description.html

 

It depends on which test instruments are used.

I have never heard of it.

Everyting shown in Optikon's tutorial is different about them.

I have never heard of them.

They are lowpass or highpass filters that normally don't resonate. If their Q is too high then they resonate.

Yes they are different.

It depends on how many stages and the frequency. The curves in Optikon's tutorial show the amount of phase-shift vs frequency for a single stage.

__________________
Uncle $crooge

 

Do you mean the key points on a sine/cosine wave? For example, and axis cross or relative maxima or minima? I think that might be it....

*shrugs*

Hope that helps....

-Infamous

__________________
-Ian

 

Thanks guys for the help

How is the butterworth,bessel,Chebyshev phase shifts differ?

Whats the DB roll off differ from all these butterworth,bessel,Chebyshev?

Do i measure the BD "roll off" with a AC meter?

How do i tell its the roll off is 3bd or 6bd or 9db?

How do i tell if the filter is a butterworth,bessel,Chebyshev how would i know?

 

Ho hum.

__________________
Uncle $crooge

 

ok

 

I don't know why I bother reading his posts anymore, everytime I'm finished I feel like I've lost a part of my life I'll never get back.

 

why does a Butterworth filter have a Flatness in the passband?

why is a butterworth filter have a -20db decade/pole roll off?

why does a Bessel filter have a linear phase?

why does a Chebyshev have "ripples" in the passband?

 

I also don't know why I bother reading his posts anymore. He doesn't learn anything. Maybe we are lousy teachers.

__________________
Uncle $crooge

 

Butterworth
1.) flat amplitude response
2.) Phase response is NOT linear
3.) phase shift is nonlinearly with frequency
4.) each frequency have a different time delay

Chebyshev
1.) overshoot and ripples
2.) Linear phase response

Bessel
1.) Linear phase response
2.) phase shifts are linear with frequency


All these types of filters are used for ONLY pulses wavefroms?

 

Damping Factor- is just negative feedback?

Negative feedback changes the frequency response
and output voltage

Damping factor- is to just get a FLAT fresponse?

 

Does the number of "poles" change the Cutoff"critical frequency?

Number of poles= roll off rate= change the Cutoff frequency?

Cascaded stages changes the roll off rate?

So whats the difference between a 8 pole filter VS a four cascading 2 pole filter stages ?

 

You could learn this stuff or just try the circuits to see what happens.
I did both.

__________________
Uncle $crooge

 

Well here you go again Walters :cry: in 7 posts in this thread you've managed about 24 questions and a few negative posts. Remember back a few weeks ago and did anything of what we said sink in. :shock: or is this thread part of your 500,000 questions your bombarding us with. Any normal student would go to the library and read a book to learn or search the net.

__________________
" The only way to avoid human error is to avoid the use of humans"