Separating bass mid and treble from an audio signal

[Laurice]

I will be working on a project that will use an audio signal to control a set of leds.

I wanted to separate the bass, mid and treble of the signal and each one will control its own set of lights. Those signals

will then be the input to the pic18lf45k22 ADC and the micro will then pulse modulate the brightness of the lights based on the amplitude of the signal.

My question is, should I use an active filter or a passive filter?

the signal will be coming from an audio jack which, based from my measurement, has an output voltage of about 3v pk-pk at max volume.

Thanks!

[Ashutosh Bhatt]

this u can easily do using 3rd order or 4th order butterworth HPF and LPF for mid range u can use notch filter – readily available ICs. with some extra additional components.

[SalDavy]

As you are working on a audio circuit and want to separate the different frequency signals. So for better efficiency you must use the active filter. You can build it using simple op-amp,microcontroller or using DSP.

[Mario Tondo]

i also want to do that kind of module or project.. can you help me do that module/circuit or do you have an idea where i can buy or who can do that circuit or module?

[Author]

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