Thanks for replies,
clipped C10 out, no noticeable difference, but big gain change with C5 clipped. Just what I was hoping!!!
thanks again!
Actually that would be sweet. Too much of a noob to know off the top of my head how you'd wire that up. But I'd be interested in thatCould you put a switch on it to remove these from the circuit? That seems like it might be a nice little addition.
Yeah, I do, more range on the Drive knob before it gets real dirty.So do you dig the lower gain sounds without the c5 removed? Thinking about making the Benson but also interested in the lower gain side of the pedal.
Just to clarify since I'm interested in doing this also when I build a Benson, by clipped do you just mean you don't have anything in the pads for that capacitor? Or do you jumper the pads?Thanks for replies,
clipped C10 out, no noticeable difference, but big gain change with C5 clipped. Just what I was hoping!!!
thanks again!
No probs with the questions, we all gotta learn one way or another.Just to clarify since I'm interested in doing this also when I build a Benson, by clipped do you just mean you don't have anything in the pads for that capacitor? Or do you jumper the pads?
Also do you re-adjust the trimmers after? Sorry for the noob questions!
Thank you! I really appreciate this info! This forum is amazing and I'm learning a lot!Here’s some background on what’s going on with these.
the reactance from jfet Source to ground does two things:
1. Affects the DC bias of the jfet
2. Affects the gain of the transistor (less resistance means more gain).
DC can’t flow through the cap. So, the DC bias is set by the resistor, regardless of cap. That’s why the trimmers didn’t need reset when the cap was clipped out.
audio signal will flow right through the cap. Basically, audio signal sees the cap as no resistance from Source to GND, resulting in higher gain. Clip it out, and now audio has to go through the resistor.
caps will affect different frequencies differently. I think the C5 and C10 caps are large enough to pass all guitar frequencies (haven’t calculated though). If you use a smaller cap value, you can get higher gain on high frequencies, lower gain on low frequencies.
it’s the same concept as ‘cathode bypass cap’ on a tube amp.
Awesome! And then it sounds like for the first trimmer it's easiest to just set the resistance before installing it.Yep that’s it exactly.
I'm about to build one and I think I'm going to attempt to mod it with a switch so I can have the option of using the c5 cap and not using it.Could you put a switch on it to remove these from the circuit? That seems like it might be a nice little addition.