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StewMac EC Expander Pedal Kit

StewMac EC Expander Pedal Kit

StewMac EC Expander Pedal Kit With Bare Enclosure

With Bare Enclosure

Item # 2352
In stock, ready to ship!


StewMac EC Expander Pedal Kit With White Enclosure

With White Enclosure

Item # 2352-W
In stock, ready to ship!


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StewMac EC Expander Pedal Kit

About This Item

The secret weapon of a blues god
The EC Expander is a powerful mid-boost that will instantly supercharge the tone of your pickups, pedals, and more. Now you can finally get this tone in a pedal.

This pedal kit is our take on the famous Strat MDX control Eric Clapton installed on all of his guitars. With just the turn of a knob this powerful mid-boost changed his bright and sparkly single coils into creamy vintage PAF-style humbuckers.

Don't buy your next pedal—build it!
We loved this unique circuit so much we made it into a pedal kit. Now you don't have to modify your guitar—you can instantly add this tone to any instrument. Step on the pedal and your single coils sound fuller, and humbuckers sound richer and more dynamic.

But the pedal you build is not just a one-trick-pony! With just two knobs you've got endless ways to shape your tone. Add just a touch of mids to fill out your sound, or crank it to totally change the tone of your amp. And it stacks well with your favorite overdrive or distortion pedal for added flexibility. If you've got some drive or fuzz pedals that just turn to mush in the mix, adding some mids from the EC Expander will make these pedals come alive.

It's more than just a schematic
We include everything you need to build your new pedal:

  • Top quality components from resistors to switch
  • Road-worthy rugged metal enclosure with all holes pre-drilled
  • Bare or powder coated white finish
  • 3PDT breakout board for low noise
  • Input, output, and power jacks rear mounted for easy cable routing
  • True bypass switch
  • Custom printed labels
  • Easy! Download your instructions
    We've made these instructions ready to download now. You can zoom in on every solder joint and resistor value to make sure your build is perfect from start to finish. With these step-by-step instructions, full color illustrations, and complete wiring guide you'll build a pedal you'll enjoy for a lifetime. Be proud every time you step on the custom pedal that you built.

    Make your pedal your way
    It's never been easier to have an inspiring sounding and looking pedal. We include labels for all of the knobs for a professional look. Paint your own raw metal enclosure or choose a powder coated enclosure that is ready to put on your board now.

    Take the first step to customize your sound.

    WARNING: Cancer and Reproductive Harm -



    Product Instructions

    StewMac Pedal Kit Instructions

    Download the assembly guide and wiring diagrams.

    Customer Reviews

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    • 4.00 average rating from 2 reviews
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    Good pedal, fun build, mismatched knobs


    Verified Buyer

    This was my first pedal build, soldering is a bit hideous, but it still works great. As another reviewer said, reading the stripes on the tiny resistors is a challenge; I resorted to a multi-meter to ensure I was putting the right component in the right place. Tedious? Yes, but in a good way! My one disappointment was the mismatch between the two knobs...slightly different shade of red, slightly different size. I opted to order clear replacement knobs, which matched well with white/black/silver elsewhere.


    Always on pedal? Great customer service.


    Verified Buyer

    This kit has great instructions and was pretty easy to assemble. I had issues with the pedal not sounding good and having very low gain. Fantastic customer service gave me the choice of a replacement or go through some trial and error with component replacement(desoldering nightmare). I chose a replacement and it was shipped promptly. After putting the replacement together, it worked great, with adequate gain and a mid boost. Adds a bit of fat to single coils. Dialed in, it could be an always on pedal.