Want recommendation about 60 Hz notch filter..

[SeungminLee]

Hi,

Recently I used various notchfilters but I am still undergoing some bad results.

Sometimes, center frecuencies varied as time passed by or Q value is not good enough.

Anyone plz recommend nice 60Hz notch filters?

 

[Kral]

Hi,
Check this out:
**broken link removed**

 

[keith1200rs]

Maybe you could post your circuit? The main problem with notch filters is making sure you take the tolerances and temperature coefficients into account. I have used simple, passive notch filters successfully but you do have to make sure you buy the right tolerance components.

Keith.

 

[liusupeng]

how about digital filter?

 

[Kral]

You can design excellent digital notch filters. Th problem is that they require so much "infrastructure"; A/D converter, a processor, D/A converter and a power supply for these components. If these subsystems are already available, then digital is the way to go. Otherwise, an analog filter makes more sense.