Multi-Notch Filter: Why 3 Not Working?

[m718]

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.

 

[vk6kro]

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.

 

[oswaler]

There could be several reasons why using multiple notch filters in a circuit may not be effective. One possible explanation is that the filters may be interacting with each other and causing interference, resulting in only the first filter being effective. This could be due to the frequency response of the filters overlapping and canceling each other out. It is also possible that the filters are not properly matched in terms of impedance, which can affect their performance when used together.

Another possibility is that the filters may not be designed to work together in series. Each filter may have a specific range of frequencies it is designed to attenuate, and when used in conjunction with other filters, they may not be effective in targeting the same frequencies. Additionally, the overall circuit may not be properly designed to accommodate multiple filters, leading to a decrease in their individual effectiveness.

It is also important to consider the quality and accuracy of the filters being used. If the filters are not well-designed or of low quality, they may not perform as expected, especially when used in combination with other filters.

In order to determine the exact cause of the issue, it may be necessary to analyze the circuit and the individual filters in more detail. This could involve conducting simulations or experiments to understand how the filters are interacting and where the problem may lie. Additionally, consulting with experts in the field of filter design and circuitry could provide valuable insights into potential solutions or alternative approaches.

In conclusion, there are several factors that could contribute to the ineffectiveness of using multiple notch filters in a circuit. It is important to carefully consider the design and compatibility of the filters, as well as the overall circuit, in order to troubleshoot and address any issues.