I got very good results with the AGC. It's working very well! The only interesting behavior is this.
Experiment #1:
When I connect the output both to the input of the MSGEQ7 and to the iPhone headphones, I get the sound in the phones but the chip receives nothing. OK, so I put a 1K resistor between the output of the AGC and the headphones input. That worked. I both heard the music and the chip was receiving input. What's the reason for this behavior? Does that have to do with the output impedance of the AGC?
Experiment #2:
Instead of going from the output of the AGC to the headphones, I put a splitting Y-adapter into the output of the iPhone so that both the AGC and the headphones received the signal independently. In this case, I didn't hear anything until I turned the volume of the iPhone all the way up.
Just curious.
Experiment #1:
When I connect the output both to the input of the MSGEQ7 and to the iPhone headphones, I get the sound in the phones but the chip receives nothing. OK, so I put a 1K resistor between the output of the AGC and the headphones input. That worked. I both heard the music and the chip was receiving input. What's the reason for this behavior? Does that have to do with the output impedance of the AGC?
Experiment #2:
Instead of going from the output of the AGC to the headphones, I put a splitting Y-adapter into the output of the iPhone so that both the AGC and the headphones received the signal independently. In this case, I didn't hear anything until I turned the volume of the iPhone all the way up.
Just curious.
