An allpass filter's output will be 90 degrees at 146Hz.walters said:This is that we have to do is this
.05uf with a 22K in parallel the frequency range is ?
An allpass filter's output will be 90 degrees at 340 Hz..047uf with a 10K in parallel the frequency range is?
One must be a resistor..01uf with a 100uf in parallel the frequency range is?
audioguru said:Changing the capacitor and changing the resistor in a RC circuit does exactly the same thing.
what do you mean NO?walters said:No its doesn't
uh, no. The capacitor value is a number. Audioguru pointed out a good equation for finding out the frequency based on a resistor and a capacitor.The Capacitor Value changes the frequency Range
NO! a capacitor is not a device that changes the frequency range. If it was that, radios wouldn't exist!a .01uf can only phase shift so many frequencys range so u have to change the .01uf to another value like a .47uf to change the frequency range
Your theory has blown me away. In other words, it doesn't make sense.The resistor can't go past the .01uf frequency range without changing the .01uf to another value like a .47uf to get a different frequency range with different phase shifts
100k with a .01uf is different than a 100k with a .47uf phase shift network whats the difference?
It's a schematic that is too small and is drawn with a lousy schematic-drawing program. I can see most of it on my big high-res LCD monitor.mstechca said:Audioguru, is that the way they gave the schematic to you, because I can't read 1/2 the writing.
Only a few of the capacitors are in parallel with a 100k resistor. Selected resistor values were calculated together with the different capacitor values to make a range of allpass filter frequencies, to cover the entire 20Hz to 20kHz frequency range.walters said:C1 through C12 all have different cap values in parallel with a 100K
What does this do?
If the capacitors and the resistors all had the same values then each stage would be tuned to the same frequency and have 90 degrees phase shift. The output would have 8 times 90 degrees= 720 degrees at that frequency, 8 times 180 degrees at 1/15th that frequency and 8 times 0 degrees at 15 times that frequency.If C1 through C12 all had the same values like .01uf what would change the phase shift?
I showed you the formula to determine the center tuned frequency of an allpass filter where its phase-shift is 90 degrees.walters said:How do i find out the frequency and phase degree for each frequency?
Which formulas do i use please to find the answers?
I showed you the formula to calculate the tuned center frequency of an allpass filter where the phase-shift is 90 degrees: 1, divided by (2 * pi * R * C).walters said:How did u get the frequency and the 90 degrees?
What formulas do u use to get the frequency at the other degrees please?
Look at the graph.walters said:how do u know its 90 degrees? with this formula
Look at the graph and make a ratio with its tuned center frequency and yours.How do i "transpose" this formulas so i can get other frequencys and phase degrees ?
Look at links about allpass filters in Google.What formulas do i use to get the phase degrees ?
Which school teaches the history of ancient guitar effects?mstechca said:Are you having us do 1/2 your school work?
The articles about allpass filters in Google might have a formula for you.walters said:Yes this formula 1, divided by (2 * pi * R * C).
doesn't work for getting other phase angles/degrees and different "input"
frequency
I need a formula that will take any "input" frequency and the RC time and give me the phase degree for the input frequency with the RC time what formula is this please?
walters said:yea i been looking there is some many formulas but i need this one only to get the answers for phase shift frequencys and degrees
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