Hi guys.
First off I know nothing about audio, and am slowly learning electronics.
This will be my first electronics project that has to do with audio so we'll see how it goes.
I am looking to eventually make some simple lights that fade in and out with music from my computer.
I have found an op-amp circuit which works fine, however i've hit a snag when it came to the envelope detector part of the circuit. I've never heard of an envelope detector before but apparently it's supposed to take a signal and average it out like this: http://upload.wikimedia.org/wikipedia/commons/d/d7/Analytic.svg
So I am trying to get mine to take the audio from my laptop and average out the signal. However when I try it with an led hooked up, the led blinks quite a bit which makes me think that it is not working correctly.
here is the circuit I am using: http://i.imgur.com/7QuQPa3.png (should say "envelope detector" rather than "lowpass filter")
When I play something like a 1khz tone the led's flicker rather than their brightness being constant.
I'm not sure if the envelope detection circuit is built wrong or if the values of the capacitor and resistor are wrong.
If I hook the led up before the signal goes through the envelope detector, it is pretty much the same result. So obviously its not doing what its supposed to.
I would really appreciate any help!!!
thanks in advance,
James
First off I know nothing about audio, and am slowly learning electronics.
This will be my first electronics project that has to do with audio so we'll see how it goes.
I am looking to eventually make some simple lights that fade in and out with music from my computer.
I have found an op-amp circuit which works fine, however i've hit a snag when it came to the envelope detector part of the circuit. I've never heard of an envelope detector before but apparently it's supposed to take a signal and average it out like this: http://upload.wikimedia.org/wikipedia/commons/d/d7/Analytic.svg
So I am trying to get mine to take the audio from my laptop and average out the signal. However when I try it with an led hooked up, the led blinks quite a bit which makes me think that it is not working correctly.
here is the circuit I am using: http://i.imgur.com/7QuQPa3.png (should say "envelope detector" rather than "lowpass filter")
When I play something like a 1khz tone the led's flicker rather than their brightness being constant.
I'm not sure if the envelope detection circuit is built wrong or if the values of the capacitor and resistor are wrong.
If I hook the led up before the signal goes through the envelope detector, it is pretty much the same result. So obviously its not doing what its supposed to.
I would really appreciate any help!!!
thanks in advance,
James