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Finding R and C values for an active second-order bandpass filter
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[QUOTE="The Electrician, post: 6859173, member: 101272"] He simplified things in a different way than I did and didn't show enough intermediate steps for me to follow his work. When I want to compare two algebraic expressions that may have been simplified to an apparently different result, I evaluate them numerically with random values. Because palacetrading interchanged R1 and R2 in the numerator of his final result, my test using random inputs gave a different result comparing what his expression evaluated to and what mine did. I see now that gneill pointed this out, which I did not notice. Using the values palacetrading found, his result and my result evaluate to the same value because R1 and R2 are both the same value, 100k, which might lead one to think his result was totally correct, which it is not unless the R1/R2 interchange is fixed. Now all he has to do is fix the R1/R2 mixup in his expression and set up two simultaneous equations and get the desired C1 and C2 values. I see that he hasn't been here lately; we may have seen the last of him. [/QUOTE]
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Finding R and C values for an active second-order bandpass filter
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