Audio board - Using mic in as input from Teensy ADC
Hello, I'm currently setting up my audio adapter board, and realized I could potentially connect the Teensy's DAC to the mic input somehow, so that I do not have to use one of the line in channels or make any funky mixing circuitry if I want to utilize the DAC with the handy output jack.
I have looked over the SGTL5000 datasheet and it appears that internally the mic input functions the same as the line inputs aside from the programmable gain.
What would I need to do, hardware-wise, in order to connect the pins? Here is what I've come up with so far, please guide me and feel free to correct me.
Hello, I'm currently setting up my audio adapter board, and realized I could potentially connect the Teensy's DAC to the mic input somehow, so that I do not have to use one of the line in channels or make any funky mixing circuitry if I want to utilize the DAC with the handy output jack.
I have looked over the SGTL5000 datasheet and it appears that internally the mic input functions the same as the line inputs aside from the programmable gain.
What would I need to do, hardware-wise, in order to connect the pins? Here is what I've come up with so far, please guide me and feel free to correct me.
- Make a voltage divider to keep the voltage below the ~2.8v maximum.
- Remove the 2.2k resistor between mic bias and the mic pin. (I am perfectly fine with permanently modifying the board in this way, if it is necessary)
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