is there somebody who knows a way to make a frecuency level display?somebody to tell me a site to help me fo this?i have find a circuit with leds but i want to make a lot of levels to display all frecuency from 20hz to 20khz.
I think you would build a VU meter, (look up a LM3915 IC) and just use a active bandpass in say 15 sets. Similar to an equalizer.
I'm not sure if there is an easier way.