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1. How do I scale RV1? Do I have to check the amplitude of the signal first? Because I want to use it in my FX loop and I donot know the output level of my FX Send. My understanding from MXR Micro Amp is, that it is one of the control knobs, so in this case the Level, but if so, wouldn't it be mentioned in the interface section of the circuit? And why are there only 3 knobs on the pedal if there are RV1 to RV4?
2. Is the +3.3V supplied by the +3.3 pin of the arduino to the whole circuit? So I just connect for example the T1 and the RV2 to this pin?
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But then I can only go louder, can't I? Because if the signal is for some reason let's say 4 V and I need to attenuate it, I cannot do it in this configuration, because the lowest amplification factor is 1.The VR1 trimmer will set the input gain of the input stage (between 1 and 20) once you set it for your guitar (or input device) you wont need to move it. I usually adjust it by ear, when it sounds distorted I turn it a bit down and that is all.
You already made it clear to me, thanksYes, the 3Ve comes from the Arduino board, and I dont understand what do you mean by "I just connect for example the T1 and the RV2 to this pin", could you explain it a bit more?
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Yes, the lowest amplification value is 1, normally a guitar signal is 200mVpp, so it needs to be reasonably amplified to have a good signal to noise ratio at the input of the ADC.But then I can only go louder, can't I? Because if the signal is for some reason let's say 4 V and I need to attenuate it, I cannot do it in this configuration, because the lowest amplification factor is 1.
you can use the 3V3 of the arduino, yes.I was just wondering, if there is some other voltage source of 3 V where I need to connect the T1 and RV2, or if it is the +3V3 pin of the Arduino.
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1Vpeak to peak is a bit high as the pedal was designed for guitar signals that usually go from 200mVpp to 500mVpp, BUT you are right, the input stage has a gain factor from 1 to 21 so using 1Vpp and x1 as a gain factor should not clip the signal.1vpp or 0.35Vrms sine wave.
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