Anyone can give me an idea of how I can build a bandpass filter using a single supply amplifier please, between 200Hz to 20kHz please. Thanks in advance regards
Yup!
First of all you would do it as a low pass plus a high pass. If it's a first order you want then you can do it with a single amp, esp with a jfet device. You make one Resistor 10x the value of the other and for economy you would make the bigger one the high pass (so you can get a smaller capacitor.
For 2nd order and above follow textbook examples. This will require at least one op amp per filter or use half a TLO72.
First of all you would do it as a low pass plus a high pass. If it's a first order you want then you can do it with a single amp, esp with a jfet device. You make one Resistor 10x the value of the other and for economy you would make the bigger one the high pass (so you can get a smaller capacitor.
For 2nd order and above follow textbook examples. This will require at least one op amp per filter or use half a TLO72.
Go to the Texas Instuments site and search for ap. note sloa058. All you ever wanted to know about opamps on single rails.
What do you need the filter for?
Osvaldo, A MFB filter night be a little tough for a beginner, do you not think?
Osvaldo, A MFB filter night be a little tough for a beginner, do you not think?
BTW Fiat Uno, if that application note is the one I think it is, then please take my advice and IGNORE the section on bandpass filters. You are not trying to isolate a very narrow band, quite the contrary, and those filters are both complicated to build and can very easily pick up oscillation. Look at the parts on Low Pass and High Pass filters - that is what you will need. One of each (though why you want to filter out things above 20kHz, I still don't know).
CT
CT
The only reason I can see someone wanting a 200hz to 20 khz bandpass is if you are trying to attenuate everything over 20khz and everything under 200hz ......
I can see attenuating everything under 200hz if you were building an active crossover and had a seperate filter for the sub 200hz range but over 20khz no one can hear and most all music isn"t going to have much if any music in the 20khz+ range ......
I can see attenuating everything under 200hz if you were building an active crossover and had a seperate filter for the sub 200hz range but over 20khz no one can hear and most all music isn"t going to have much if any music in the 20khz+ range ......
For this reason I suggested to use online calculators that work fine.
One of them is:
Multiple Feedback Low-pass Filter Design Tool
Salu2.
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