Multi-Notch Filter: Why 3 Not Working?

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Using multiple notch filters in a circuit can lead to issues where only the first filter functions effectively, often due to load problems. The interaction between the filters can affect their performance, particularly how the output of one filter presents to the input of the next. Proper consideration of the load impedance is crucial in filter design to ensure each filter operates as intended. Testing the circuit with different configurations may help identify the underlying issue. Understanding these dynamics is essential for achieving the desired attenuation across multiple filters.
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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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