All Pass Filter Problem

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ShayanZulfiqar

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Hello guys,
I am currently working on an all pass filter. I am using 1uF capacitor and 20k pot to vary cut off frequency and the other two resistors are of 1k. I have tried various op amps (tl032, 062,072,082) but nothing is happening. There is no phase shift in the output wave whatsoever. Any suggestions?

Thanks in advance.
 

Hi,

R is no pot in the circuit.
And if you really installed a pot, then show us how.

Klaus
 

I have no problems to imagine R as a variable resistor. But all we can say is, the circuit will surely work if build correctly. In other words, if there's a problem in your hardware, it can't be seen in this schematic.

Next step is to reveal the complete test setup. How is the OP supplied, what's the signal source, how do you measure the expected phase shift?
 

ShayanZulfiqar said:
...... but nothing is happening. There is no phase shift in the output wave whatsoever. Any suggestions?
Click to expand...

"...nothing is happening"? I can`t believe!
Either you will have a DC voltage at the output or an ac signal or something else...
I think, we can give an anser onlx if you tell us what the input signal is and what you can see at the output.
 

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