I am looking to build some modular bandpass and lowpass filters for some projects.

Here is an example of a 40m Butterworth bandpass filter

I am using the AADE software for the modeling.

Goals:

I would like to design some filters that use common value components.
Bandpass
Lowpass
Make a small modular board with header pins

The idea is that you could plug the modular card into a breadboard or pcb with header pins. There are a lot of times when I am prototyping that I would like to have some filters on hand and a modular approach would be incredibly helpful.

So tonight I am spent a little bit of time bonding with the software looking at some design options and then comparing the part values with standard parts that are available at Mouser and/or Digikey.

Part of the magic is converting the parts to standard sizes and then rerunning the model to see if the parameters are still close enough that the design remains valid.

73 de NG0R