I calculated value of inductors and capacitors by using online calculators and document that I attached to post. I want to obtain 17 kHz cut off frequency. According to document and online calculator value of capacitors and inductor are given below. Since I have restriction in component heights in my PCB, I used these values L1 and L2 4.7uH, C1 and C3 4.7uF and C2 is 22 uF. According to these values I am getting 17Khz cut off frequency in LTSpice. According to document values that I used in LTSpice is not correct, but I get correct cut offf frequency. If cut off freqeuncy of filter depends on formulas how I can get correct cut off freqeuncy in LTSpice with wrong component values? Regards.
*I am using Butterworth Filter.
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