Trying to understand whats happening in this Tone Job pedal

[kylewetton]

Trying to level up here

https://docs.pedalpcb.com/project/BoxAndAll-PedalPCB.pdf

Looking at the input and output buffers, what is the role of R2 and R11 coming from the voltage divider in the power section? Why connect the input to VREF like that when the op amp is powered by pin 8 already?

 

[kylewetton]

Ah never mind, the answer of course came from Jack Orman, who wrote about op amp buffer patterns https://www.muzique.com/lab/buffers.htm

 

[Robert]

We were just discussing VREF in another thread the other day:

Understanding VRef

Hi everyone, I've recently been playing around with circuits on a breadboard and as I wade a little deeper I'm starting to come across VRef but I'm not completely understanding what it is or its function. Why is it necessary to have a virtual ground as opposed to GND? For example, in the...

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