Resistor and Capacitor before Op-amp Follower Circuit

A

Arno

I am still working on a personal project to use an Electrosmith Daisy Seed as a guitar pedal. While doing some research, I came up with my own textbook inverting amplifier setup to take the 10kOhm impedance output with 10dBV (9V p2p) of another guitar pedal and shrink it to values that the Daisy Seed ADC can handle ie. 3.6V p2p while providing high input impedance (1MOhm as seems to be standard).

While looking some more I found this website which offers guitar pedal PCBs and one specifically for the Daisy Seed. The documentation for this shows the solution for feeding audio into the Daisy Seed, and I am rather puzzled by the circuit:

Input buffer for Daisy Seed

I understand that the op-amp is setup as a voltage follower, I also understand that the voltage divider R1&R3 will bias the signal for the op-amp, and I will take a guess and say that C6 serves as DC blocker. But then I am puzzled by the functions of C1 and R7, as well as C7.


  1. Why are they here ? Especially R7, I thought I could just bias the signal using the voltage divider and go straight into the op-amp, why is R7 there ?


  2. Secondly, I am also unsure about what guarantees that the incoming signal won't fry the Daisy Seed, as the voltage follower does not scale it down to +1.8V/-1.8V and no DC blocking capacitor is on the output side to un-bias the signal. Am I missing something ? I am not sure what voltage is fed to the TL072 VCC pin, could that be the limiting factor ?

Thank you for helping me understand, as this ready-made solution differs greatly from the solution I came up with on my own and with the help of the nice people in the previous thread I posted.
 

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