Blue box starve mod

[SprinkleSpraycan]

I've been modding an mxr blue box pcb and I want to see what kind of craziness a starve pot might do.

If you look at the power section I drew in what I did on the voltage divider. Works well to get splatty/spotty sounds. Im curious though, would i get better results targeting a specific vref point to the 4558 instead of dropping the entire vref voltage across the board?

[Mark Hammer]

A "normal" functioning Blue Box will be sputtery and splatty on its own, simply because of  inconsistencies built in to its tracking.  So I'm not sure what value starving the chip would provide.

Note that the rectified voltage, coming off D1 feeds R13 and R19, turning Q2 and Q3 on.  In effect, the circuit provides a gate to compensate for the poor tracking. But what if we played with the gate?  So, add a little slower turn-on and turn-off time.

[Rob Strand]

I've been modding an mxr blue box pcb and I want to see what kind of craziness a starve pot might do.

If you look at the power section I drew in what I did on the voltage divider. Works well to get splatty/spotty sounds. Im curious though, would i get better results targeting a specific vref point to the 4558 instead of dropping the entire vref voltage across the board?

I have a feeling it's the vref to IC1.1 but like all these things you need to experiment. 

See what happens when you vary Vref on IC1.1 alone,

- vary Vref to  R3  (and C2, C4)

and then try, varying Vref on IC1.2

- vary Vref to R5, R6

Put a fix Vref on the "Vref" that isn't varied.