- #1
Rob119
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http://www.flickr.com/photos/61432156@N02/5593767202/
Ok so I'm trying to find the transfer function relating voltage across the 8 ohm resistor (speaker) with the input voltage for the circuit shown above...
The two op amps simply provide a gain of 3... and by simple voltage division I am getting the transfer function (Vspeaker / Vinput) to be 3*(8/(8+1/sC1)) or [24sC1/(8sC1 + 1)].
It looks to me as if C2 and R5 have no effect on the transfer function...
But my professor is asking to design C1 and C2 such that there are TWO corner frequencies (-3dB points) at 80Hz and 28kHz... how can this be possible if the output across the speaker is simply a high pass filter? Or did I calculate the transfer function wrong??
Ok so I'm trying to find the transfer function relating voltage across the 8 ohm resistor (speaker) with the input voltage for the circuit shown above...
The two op amps simply provide a gain of 3... and by simple voltage division I am getting the transfer function (Vspeaker / Vinput) to be 3*(8/(8+1/sC1)) or [24sC1/(8sC1 + 1)].
It looks to me as if C2 and R5 have no effect on the transfer function...
But my professor is asking to design C1 and C2 such that there are TWO corner frequencies (-3dB points) at 80Hz and 28kHz... how can this be possible if the output across the speaker is simply a high pass filter? Or did I calculate the transfer function wrong??