Hi members,
I am doing an audio amplifier and I need a low pass and a high pass filter to block unwanted signals. In simpler words what I want is a bandpass filter, but I know how to do a low pass and high pass only one tackling them as an individual and not when I need to use them together as my knowledge I have, thats what I imagine that would need to happen. Is there any good tutorial on how to this for an inverting amplifier please as shown in the below link.

http://www.play-hookey.com/analog/images/non-inverting_amp.gif

Thanks in advance.

Regards
Fiat uno

 

An easy way to design active filters is the free Filterpro program from TI.

 

Thanks for your help, but what I need is to work it from first principles. I know how to work out the capacitors and resistors needed for a high pass filter and for a low pass filter, my only problem is how do I configure both at once it to have a bandpass filter. Thanks again.

 

check this out, most basic http://www.electronics-tutorials.ws/filter/filter_4.html

really you are simply cascading the two letting the signal pass through both.