Hi Yago,
Sure. I have tried will different power supplies, including an external battery, but is always noisy. Does the reading on pin 3 ring any bells? It's 0.8 instead of 0.1.
it may be because the pedal is taking too much current...
- Did you check the power supply voltages at the test points? do you have +5V, -5V, +3.3V and 1.6V (Bias)?
- What voltage can you measure on the pins of R2? they should be +1.6 and 0.8.
- Did you check if the output stage is working fine?
Keep us updated on your progress!