Part 1) Precision Half Wave Rectifier
Half wave rectifier only allows half of the wave to flow in the positive direction. The output of this circuit is only the positive half of the input, and is 180 degrees off phase
Part 2) Envelope Follower
Part 2) Envelope Follower
Envelope follower outlines the peak of the wave, and it smooths at higher frequency.
Part 3) Comparator
Part 3) Comparator
Right now the LED lights up purely in response to the volume of your audio. What would you add to your circuit if you wanted the LED to be triggered only by high pitched sounds? By bassy sounds?
- To make the LED be triggered only by high pitched sounds or by bassy sounds, I would add a highpass filter or lowpass filter before the circuit.