Mosky XP Boost / Expression Pedal Modification
Hi All!
I bought a Mosky XP Booster pedal (one-knob clean boost) with the idea of hacking into the pot. and wiring a jack in it that I could plug an expression pedal into so I could run it as a volume-pedal / booster with a remote expression pedal.
I do like a linear expression pedal for my purposes more than an audio taper.
Does anyone know what value expression-pedal would be optimal, or even better how I could add an expression pedal that would make the range go 0-to-75%?
Thanks!!!
I bought a Mosky XP Booster pedal (one-knob clean boost) with the idea of hacking into the pot. and wiring a jack in it that I could plug an expression pedal into so I could run it as a volume-pedal / booster with a remote expression pedal.
I do like a linear expression pedal for my purposes more than an audio taper.
Does anyone know what value expression-pedal would be optimal, or even better how I could add an expression pedal that would make the range go 0-to-75%?
Thanks!!!
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- mauman
- Resistor Ronker
Welcome to the forum!
Mosky say it's based on the Xotic EP booster, if so, thread and schematic: viewtopic.php?t=7881 The Boost pot is a 10kC that bypasses the Q1 source resistor (in series with a cap), so that would require a 10k pot in your expression pedal. Wire the pedal just like the Boost pot, with lugs 1 & 2 to ground, lug 3 tied back to the Q1 source bypass caps. You'll want a switch to select either the internal Boost pot or your external expression pedal, else they'll be in parallel and won't give you much range.
Mosky say it's based on the Xotic EP booster, if so, thread and schematic: viewtopic.php?t=7881 The Boost pot is a 10kC that bypasses the Q1 source resistor (in series with a cap), so that would require a 10k pot in your expression pedal. Wire the pedal just like the Boost pot, with lugs 1 & 2 to ground, lug 3 tied back to the Q1 source bypass caps. You'll want a switch to select either the internal Boost pot or your external expression pedal, else they'll be in parallel and won't give you much range.
Hi thanks so much for this!
10k is a relief, as there are a host of expression-pedals already with that value.
I think I'm just going to replace the pot with the jack and not have a pot on the stomp box.
One more question if you don't mind?
If I want to limit the range to 0-75%, could I just insert a resistor into the circuit to achieve this?
Thanks again!
10k is a relief, as there are a host of expression-pedals already with that value.
I think I'm just going to replace the pot with the jack and not have a pot on the stomp box.
One more question if you don't mind?
If I want to limit the range to 0-75%, could I just insert a resistor into the circuit to achieve this?
Thanks again!
- mauman
- Resistor Ronker
If you're using a 10kB expression pedal, add a resistor in series, somewhere around 500 to 700 ohms. That will limit the 10kB to a 95% value at full rotation, which matches a 10kC Boost pot that's limited to 75% rotation. The fully counterclockwise direction will not be noticeably different, although the taper will be different.
Whoops!
I just had that "duh" moment.
I realize that the potentiometer on the booster pedal I ordered (Mosky XP Booster) will probably not be zero-volume to plus-boost sweep.
It will probably be a zero-boost to plus-boost sweep,
Now I am wondering if any combo of pots and resistors would give me a zero-volume to boost sweep?
Or should I rethink this and just find an active volume-control circuit and build it?
Thanks!
I just had that "duh" moment.
I realize that the potentiometer on the booster pedal I ordered (Mosky XP Booster) will probably not be zero-volume to plus-boost sweep.
It will probably be a zero-boost to plus-boost sweep,
Now I am wondering if any combo of pots and resistors would give me a zero-volume to boost sweep?
Or should I rethink this and just find an active volume-control circuit and build it?
Thanks!