I would like to start this thread in simple terms, at least initially, just to get an idea of what is required for the following project and then get more in detail when necessary. We are working on a project where we are using a simple mic an amplifier, controller and a few LEDs. the Idea is that the leds will be activated by the mic once the dB level har reached a critical level. (You talk and the lights go on basically). What I would like to discuss and get some feedback on is how to make possible a circuit so that the LEDs fade in and out when we have sound. We are right now thinking of using a condensator for this purpose. But we are not sure how to implement it in the system to make the idea funtion. Can one just connect the right condensator between the microcontroller and LED as simple as that or does one have to take more into account? Does AC/DC play a factor here. Attached you will find a picture of the circuit schematics. Thanks for your time.