Wizardofwoz66
Member
Would anyone care to explain what the trimpot in the Roboto actually does? That Op Amp is set up in a pretty strange configuration (I'm fairly new to electronics, but it's not the way that I've seen either traditional inverting or non-inverting Op Amps set up) and it doesn't appear to be acting as a buffer. I ask because I built one of these for someone, and it's VERY loud with the trimpot in almost any setting except cranked all the way back, at which point the volume pot becomes slightly more useable. I'm assuming the TL072 is amplifying in some way and the trimpot controls the gain, but I'm looking to learn a bit more about how this specific op amp works since it's connected to 3.3V and not to ground anywhere. Any help is appreciated. Thanks!