This is the third video in our filter design series and we’re finally looking at variable filters! We’re starting off with an overview of some basic techniques and then switched resistor techniques in detail, building up an example and measuring it’s performance.
To get started, you can use the spreadsheet that we’re covered in our previous video here to design it for the highest frequency, and then use the techniques covered here to make it variable.
In the next video we’ll cover some more advanced techniques for variable filters still moving towards a microcontroller controlled filter.
