Notch Filter 50Hz - frequency response

215

03:48:54

Notch filter for 50Hz using single opamp. 

published 8 years ago

thebugger

8 years ago

You can get a more a much steeper attenuation by using a second ordee filter (LC). -30dB is not very attenuated. I like to attenuate the fundamental up to around 60-80dB, maybe somewhat higher if the input swing amplitude is large.

2ctiby

8 years ago

Is this any use? http://everycircuit.com/circuit/5329985409122304

2ctiby

8 years ago

Here is yours...adjusted input and op amp: http://everycircuit.com/circuit/5087304321859584

thebugger

8 years ago

Yeah, that's better, just keep the characteristic impedance of the notch filter low, so that variations of the capacitance or resistance don't affect the center frequency much (in reality). Also use a MOS op amp. I usually like to use LC filters, but they're harder to tweak, so an Rc filtet does the job sometimes as well.

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