Design an audio level indicator & amplifier circuit that lights up a different number of LEDs based the volume of the input signal and the circuit must turn on an LED when turned on and have at least 4 levels of audio indication using LEDs.The circuit must have a microphone and an aux input, easily switchable from one input to the other. The amplified sound output should measure 70 dB at 3 feet away from the speaker(Speaker= approx. 8ohm load). Need a working schematic.