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).
For other amounts of phase shift you can change the center tuned frequency, look at the graph or look in Google for a detailed and complicated formula.

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Uncle $crooge

 

1, divided by (2 * pi * R * C).

This is only for the "center frequency" only and how do u know its 90 degrees? with this formula

How do i "transpose" this formulas so i can get other frequencys and phase degrees ?

Like whats the phase degree at 100hz
phase degree at 200hz
phase degree at 500hz

What formulas do i use to get the phase degrees ?

 

I think that phase shift circuit is actually meant to be part of an SSB modulator...

One method that I don't think anybody mentioned yet is to use an op-amp to "amplify" the capacitance of a varactor using the Miller effect. The only limitation is the total amount of charge this "capacitor" can hold--the voltage across the capacitor is multiplied by the same gain that its C value is, and this voltage can't be any higher than Vdd - Vin (or less than Vss - Vin, depending on the polarity of Vin).

 

Look at the graph.
Look at links about allpass filters in Google.

Look at the graph and make a ratio with its tuned center frequency and yours.

Look at links about allpass filters in Google.

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Uncle $crooge

 

I think 2 * pi in the equation converts radians into degrees.
Isn't pi also 90 degrees, or no?

And Walters, What do you intend to do with phase shifts anyway?

You seem to be asking all sorts of questions, and I just don't know exactly how you use our answers. Are you having us do 1/2 your school work?

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-=: The best low-priced components to troubleshoot with are the speaker and the LED :=-

 

Which school teaches the history of ancient guitar effects?
I think "flanging" was discovered "a few hundred years ago" by the Beatles, when two tape players weren't quite syncronized. Later, when every guitar player on earth bought bucket-delayline ICs to make the effect electronically, nobody bought the ICs anymore so most Semi companies stopped making them.
I am surprised that nobody makes a fuzz IC with famous guitar players' names on the pins to be shorted to ground for their particular kind of severe distortion. :lol:

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Uncle $crooge

 

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?

 

The articles about allpass filters in Google might have a formula for you.

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Uncle $crooge

 

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

 

I don't know how you plan to understand electronics with out first understanding basic mathematics.

 

just self taught with some books

do u know the formulas i need please

 

Using a formula isn't the answer. Understanding the "why" will answer the "how."

 

I think walters needs this question asked to him again:

What are you trying to achieve?

I mean why would you want one formula for input, RC time, and phase? To me it is senseless to try to combine everything into one formula.
I only look at the RC time. Input is just input. and if the input is a speaker, check it's resistance, and then treat it as a resistor.

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-=: The best low-priced components to troubleshoot with are the speaker and the LED :=-

 

The low frequency resonance of a speaker causes it to be a lousy microphone.
Try making an allpass filter, a variable phase shift or a comb filter with just a speaker.

I know what you can do with the speaker: spin it! :lol:

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Uncle $crooge

 

In fact, connect a speaker to a circuit of some sorts, and to a motor, and see if you can power the motor from the techno music in the room! :lol: :lol:

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-=: The best low-priced components to troubleshoot with are the speaker and the LED :=-