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Mixing sine waves

#1 · December 3, 2024, 8:13 am

Can anybody help? I'm fidgeting with complex sine waves and filters. I create complex waves with different wave generators and then a low-pass filter (or a high one, or both) and check how the different waves get blocked accordingly... in theory. The problem is that all of them seem to pass the filter(s).

I'm sure I'm not doing it properly but I don't know where the problem is. Attached is an example.

Thanks.

Uploaded files:

filters.sim1_.zip

#2 · June 1, 2025, 3:11 pm

The filters you are using are a high pass and a low pass. They do not pass or block a narrow range of frequencies.

If you want to see the filtered output of one of the input frequencies you can use a bandpass filter (series resonant LC filter for the desired frequency.