I just watching a few videos on you tube about guitar pental effect sircuits and i just plug the oscilloscope terminal probes into my guitar's output and take peaks mazurment, 50mv up to 600 mv common Vpeak range and 800mV-1V just for fragments of mS then i deside to make this sircuit without plug any voltage from 9V battery instead i use a audio transformer to create +-4V, this sircuit it would work like distortion from 100mV-600mv from guitar's pickup input above 600mV the waveform start to became like square wave and less 100mV start loosing gain and looks mostly like shine wave and all this with 30-40 turns on primary if you wound 10 turns you get more output voltage thus more efficiency/ my opinion is to use 1:15 scale ZXY2207 600:10k is audio transformer i find it on Aliexpress i just place an order......if samebody get any positive results from this sircuit contact at FIESD@proton.me
