Sunday, 3 March 2019

transistors - Controlling LED with 300mV AC signal


I would like to control an LED with audio signal, but the problem is, that output signal is only 150mVpp (with 150mVpp positive offset). In my understanding, it needs to be higher than 0.6V to get the transistor running, therefore I am not sure what to use instead. Do I maybe need an opamp in the middle? Any tips?



schematic


simulate this circuit – Schematic created using CircuitLab




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