Monday, 3 April 2017

Difficulty with Common Emitter Amplifier



I'm trying to take the input from a microphone and use it to power an LED, so that it's off at ambient sound, and (the peak brightness) gets brighter with noise level. It's okay if it flickers, I'm just trying to get the peak voltage to be proportional to sound levels.


What I know: - The loudest sound I use causes the microphone to emit 80mV - The LED faintly lights at 1.8 V - The LED maxes out at 2.2 V - The transistor I'm using activates when V_be > 0.6 V


What I have:


schematic


simulate this circuit – Schematic created using CircuitLab


I tried to make a voltage divider so that the voltage between RC and RE was 1.8 volts, and 0.6 for R1 and R2. However, this doesn't work, simulated or on the breadboard. What am I doing wrong?




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