I’d recommend either omitting the Volume control entirely or instead using a smaller value pot (for a low impedance output) like a 25K or 50K as the Volume at the output of the preamp before it hits the footswitch. Using a 250K pot first in the chain directly after a passive bass (which I assume has its own volume controls already) would load down the signal of your bass unnecessarily. If you do need a volume, put it after the preamp and it will be effectively buffered from loading the signal from your bass.Just love the nordstrand 2b preamp, i think it's the most clear sound without coloring the signal. I was thinking to buy the starfire preamp, but i was looking for something small, esasy to carry & cover my necesities, just 2 bands & volume its what i need.
I decide to make my own preamp pedal with a onboard pream& now im sharing probably,View attachment 4567584 will help more than one
interesting.
I’ve put an East-designed ACG filter in a box fed isolated power from a Cioks supply and noticed no extraneous noise issues, though it will depend quite a bit on the supply you use
ahh true, ..i have a Cioks too,...and a cheap multi PSU which has also isolated outs.
Any volume pot placed at the input to the circuit will load the high-impedance pickups in your bass, but the active preamp acts as a buffer and lowers the impedance of the signal so a volume pot put after the preamp won’t suffer from the same loading issues. For a low impedance signal you use a smaller value of volume pot because a larger value will act more like a switch (on/off) with all the volume sweep in a tiny portion of the resistance sweep while a smaller value pot can act more naturally and with no loading effects
As I mentioned above, if putting in a box you’ll want to either omit the volume controls entirely or move a single volume of a smaller value to the end of the circuit (to a point after the preamp has lowered the signal impedance). You could still use a typical 250K or 500K pot at the end of the circuit but the taper will be off.
Really simple. If you want a box with a bypass foot switch and LED you can copy the above diagram for the basic wiring of the jacks, LED, and foot switch. The Blue lead coming from the foot switch will be the input to the ACG preamp and the top right white lead to the foot switch will be where the output from the ACG preamp goes, the sleeve ground from the input will go to the ground of the ACG (ignore the pots in the diagram and wire the ACG according to the ACG preamp manual). If you are using an ACG with a Blend control (ACG EQ-01 for example), you’ll just have to choose either the neck or bridge input and leave the Blend control set to that side when using the box (since these preamps use a stacked control for Volume/Blend). You could also play around with splitting the input bass signal (again using the blue lead from the foot switch) to both neck and bridge inputs and if using the EQ-01 and it’s dual filters then you could blend between different filter settings!
My ACG pre at the time was an EQ-02 with only the single filter, so I just put my input into one side of the blend. If you have an EQ-01 I think you could send the input to both sides and actually blend two different filter tones which could be pretty neat!
