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My circuit (Butterworth LPF) doesn work (no output)

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hisham335

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My circuit donot work

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?
 

My circuit donot work

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.

Again post your circuit as image.
 

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    hisham335

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Re: My circuit donot work

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. :)
 

My circuit donot work

hi.
please simulate your circuite in orkad or pspice.

and then set up this .
 

Re: My circuit donot work

post ur circuit as an image
otherwise the answers u get will be gusses at best
if ur beginner use only PSpice
do not go for orcad

no body can solve ur prob without seeing the circuit diagram
 

Re: My circuit donot work

uses simulate with electronic workbench, you can analyse with osciloscop, frequency generator. very simple and quickly..
 

Re: My circuit donot work

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
 

My circuit donot work

If T=RC,then maybe the frequency is up 3.5kHZ.So the circuit can not work.another case is the capacitor is bad.
 

Re: My circuit donot work

hisham335 said:
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?
Click to expand...


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.
 

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