Try This Mod! [Ep 4] DIY Overdrive Build - Breadboard Guitar Pedal Circuit

[@raden_mangkugitar]

how to make an overdrive more tight? where we can change some capacitor value or resistor value usually?

[@arito]

Thanks for watching! It depends on your image of "tight," but if you want to adjust the low end response, check out Episode #2 of this series!

[@miyanovic]

What is the difference between connecting the diodes to Vb and not to ground?

[@Aleph_Null_Audio]

I don't think it changes the sound much, but it does mean you don't have to use decoupling capacitors between the opamp stages and you can bias them together instead of independently. So It saves you two caps and a resistor.

[@arito]

Thanks for watching! The simple answer is; if you connect it to ground, you won't get a useable signal out of the pedal. Without getting too technical, Vb is a DC bias voltage that is used as a "virtual ground" while the signal travels through the two op amp stages. As the viewer above has touched upon, unless you decouple the signal and bring it back to "true ground," you want the signal/circuit to reference Vb as if it were ground. I talk a little about virtual ground in my "Breadboard Overdrive Build Part 3" video around the 32min 43sec mark. Hope this helps!