Multi-Notch Filter: Why 3 Not Working?

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SUMMARY

The discussion centers on the issue of using multiple 60Hz notch filters in a circuit, specifically why only the first filter functions effectively when three are connected in series. Each filter provides 12 dB attenuation individually, but the cumulative effect is not achieved due to load problems. The participants emphasize the significance of load considerations in filter design, particularly how the output of the first filter interacts with the input of the second filter.

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m718
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how come more than one noth filter doesn't work. I Have three 60hz filters that have 12 db attenuation each when used one at a time but when I put them one after another in the circuit only the first works. all connections are proper I made the circuit many times because I thought I was doing somthing wrong.
 
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Sounds like a load problem.

Load is an important factor in filter design, so you would need to consider how the input of the second filter looks to the output of the first one.
 

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