Eletric Guitar Tuner opamp problem

[Grumpy_Mike]

@rafalbormann

and what is the function of these capacitors in the circuit how do they act to prevent noise

Yes they prevent noise, this is how.
De-coupling tutorial

De-coupling Tutorial

De-coupling Once you get more than a handful of active components together you need to de-couple the power supply. What this is, and why, is described here. The problem When an otherwise good design works, but is erratic, unreliable or just goes crazy then nine time out of ten it is the power supply de-coupling. And you will find that the tenth time, turns out to be power supply de-coupling as well. So what is it, and why is it needed? Basically when an integrated circuit works it works by swi…