I want to make a bandpass filter with a differential input. The filter I wanted is ready, but I made it for a single input. How do I make this filter suitable for differential inputs?

The filter I made:

the filter I made

  • \$\begingroup\$ Use a decent audio transformer at the input --> massive common mode rejection is a big bonus along with another big bonus of signal isolation. \$\endgroup\$
    – Andy aka
    Sep 7 at 8:59
  • \$\begingroup\$ Why not use an active 2nd order filter, instead of the two 1st order sections (the overall response is, at the very best, a critically damped response). \$\endgroup\$ Sep 7 at 9:43
  • \$\begingroup\$ I'm just starting to learn about these issues. @aconcernedcitizen , 2nd will the input signal be differential input when I use an active filter of order? Could you you give some detailed information? Thank you. \$\endgroup\$ Sep 7 at 9:50
  • \$\begingroup\$ @Andyaka Can you tell me some sample circuits? I'm just learning about these things. \$\endgroup\$ Sep 7 at 9:57
  • \$\begingroup\$ @dmrmuhammet unfortunately this is not what this site is about. It's a question and answer site. \$\endgroup\$
    – Andy aka
    Sep 7 at 10:22


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