LEDs to Signal Activity

[Shambles]

I'm fairly new to circuitry and playing around with a project. Its a three parter but all parts are similar. I want to add LEDs to let me know when certain things are active. I have a Microphone module, a Wireless Module, and Specific Pin that transfers Data that I want to track.

What I'm wondering would be, given a simple microphone on a wire that connects into a circuit board, how hard would it be to add a LED to note when it is powered and ready to receive voice data.
I have a LED with Resistor that function well, with minimal power. But I'm not sure how to approach this.

 

[audioguru]

An electret mic uses a DC current of only 0.5mA. But an LED is very dim with only 0.5mA so a DC amplifier (a transistor) is needed to light the LED when the mic is powered.
Maybe whatever turns on the power for the mic can also light the LED.

 

[mbarazeen]

you mean the specific pin transfers data digitally? and you want to know when its active?
if thats the case, you can use a diode & a capacitor to rectify the out put and then feed it to a transsitor that would turn on the LED.