![]() can you please tell because of what this is happening? here in circuit i'm using single power supply opam and LM358 as opam. ![]() so please help me to find the problem in circuit.how should i remove such noisy signals as when there is no input. This waveform should be exactly of zero gain as there is no input but it isn't. In practical application when i'm giving input through CT(it is around a wire of water pump from which i'm taking current wave as input and converting it into a voltage waveform using 10E resistor) waveform is not in proper sine wave form but still filter is working fine and giving proper output which it should have to give.but as soon as i shut the pump down i get some unexpected output i.e.noisy waveform on DSO of particular interval. i should get maximum gain at 50 and i got the result as im expecting but whenever i dont give any input to the input pin still i get some sort of signals.But this case happens when i go for practical but on simulations it works fine.I'm checking output after C3 capacitor.as only upto this circuit(means upto C3) it acts as filter after this it is a rectifier circuit.i'm taking input of 50 hz through current transformer(CT) and 10 E burden resistor. Hello, Everyone I've attached one file and there i tried to design a bandpass filter for 50hz.i.e.
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