I searched but couldn't find an answer.
Building a silence detector for one of our remote radio stations.
Using the headphone output of a portable transitor radio as the input signal. Needed to build a peak detector/envelope follower circuit which would have complicated the power supply so I decided to try to use the Sparkfun Sound Detector instead since it appears to have all the outputs I would need. I've already got the code working to detect and send an email upon detected silence. I just couldn't get the signal clean enough without a peak detector or envelope follower.
My Idea is to remove the Electret mic and replace it with the headphone output from the radio. Is this feasable? I looked at the data sheet for the mic but it doesn't appear to list anything for output. My concern is over-driving the Sound Detector's circuit with the headphone signal.
I realize I can decrease the gain if needed by adding a resistor to R17 but I don't want to blow it up right off the bat and do not understand the circuit (and these mics) enough to know if this is even possible.
Thanks in advance for any help!