Hi,

I'm working on a Teensy circuit to measure audio frequency input. See schematic of what is recommended. It wants a bias voltage of 0.6v at the Teensy input. I understand why it's 0.6v at point A, but I don't get how it is also 0.6v at the Teensy Input. Please explain.

Thanks!

 

It depends on the input impedance of “teensy input.” If it is 1M, there is very little drop across R3. If it is 47K, the voltage is halved.