I design a Butterworth LPF of order(5) by use op-amp.The problem is i test the circuit But it didnot work,i donot know the reson of that.My cutoff frequnacy is 3.5kHz and the resistanse(4.5kΩ) and capacitor(10nf) which used in cutoff frequancy.My ciruit has 3 statges.
Please any suggest or any Sites to know, What is rong in my cicuit? and Why there isnot output? and How can do agood test and get the output?
Post the circuit, one problem comming to my mind is that "WHY FIFTH ORDER?" guess how much power is lost in opamps?
Theoretically and in high tech corporations labs situation is perfect and ok, but as I think it is practically the fifth order active filter and your situation is most likely academic one is not a good idea.
its best to design it in spice first, then build the circuit. unless it works in spice, don't bet the real circuit will work. normally it doesn't work on the first 100 tries.
I guess you can find some circuit similar to yours at
discovercircuits.com . Try to understand that and try to work it out.
May be you end up finding the problem in your circuit.
bye
I design a Butterworth LPF of order(5) by use op-amp.The problem is i test the circuit But it didnot work,i donot know the reson of that.My cutoff frequnacy is 3.5kHz and the resistanse(4.5kΩ) and capacitor(10nf) which used in cutoff frequancy.My ciruit has 3 statges.
Please any suggest or any Sites to know, What is rong in my cicuit? and Why there isnot output? and How can do agood test and get the output?
1-I mad simulation by pspice which be in orcad and is told me is good and can use it.
2-I choice the order of filter because i make this fiter to receive a signal from Microphone and make flitration to get the Human beand frequancy(0 to 3.5kHz). If u has any suggest of the order of the filter tell me.