Hey. I am currently working on building a circuit that should receive sound input from an electret mic, and then based on the output voltage, light up a certain number of LED's. For example, if the sound is low it should light one LED, and if it's very high 3 LED's. I imagine that 3 LED's total is a good number. I have tried different setups with no luck so far. Does anybody here have any experience with a build like this, and is it possible to make without a programmed chip?