Fumble Boost Drill Template
PedalPCB · 125B
Template details
- Circuit
- Fumble Boost
- Vendor
- PedalPCB
- Enclosure
- Hammond 125B
- Dimensions
- 63.6 × 119.3 × 35.8 mm
- Layout
- 125B 2-Knob (Type 1)
- Category
- Boost
Export formats
- PDF: print at 1:1 scale
- SVG: vector graphic
About this drill template
Drill template for the PedalPCB Fumble Boost, sized for a Hammond 125B enclosure (63.6 × 119.3 × 35.8 mm). The pre-positioned holes match the PCB's pot footprint exactly, with the footswitch centred below the 2-knob layout. Print at 1:1 scale, tape to the enclosure face, centre-punch, and drill. PCB and parts not included.
PedalPCB description: “Compare to DUMBLE® BBC-1 / JHS NOTADÜMBLË Clean Channel”
A two-knob clean boost/preamp that PedalPCB compares to the Dumble BBC-1 and the clean channel of the JHS NOTADÜMBLË. Input sets how hard your signal drives the circuit and Level sets the output, which makes it one of the simplest drill layouts and builds in the catalogue.
Clean gain with a smooth top end: works as an always-on sweetener or a solo push in front of a breaking-up amp.
Build notes
Two-knob layouts leave plenty of space inside the enclosure: the PCB, jacks, and 9V supply all have room to breathe.
The Hammond 125B is one of the most common DIY pedal enclosures: a touch larger than a 1590B, slightly smaller than a 1590BB, with room for almost any single-effect PCB plus 9V supply.
Vendor specs: Designed for a 125B enclosure with top-mounted jacks
Controls
- Input
- Level
Drill measurements
Hole centres for the 125B 2-Knob (Type 1) layout. X runs left to right from the centre of the face being drilled. On the enclosure face, Y is measured from the centre, positive towards the top. For holes on a side, Y is the distance down the wall, measured from the face edge. Export the PDF for a 1:1 printable version with a scale check.
| Hole | Face | X (mm) | Y (mm) | Diameter |
|---|---|---|---|---|
| Pot | Enclosure face | -16.5 | 38.1 | 7 mm (0.28 in) |
| Pot | Enclosure face | 16.5 | 38.1 | 7 mm (0.28 in) |
| LED | Enclosure face | 0 | 12.7 | 6.4 mm (0.25 in) |
| Footswitch | Enclosure face | 0 | -45 | 12 mm (0.47 in) |
| DC Jack | Top side | 0 | 14.2 | 8 mm (0.31 in) |
| Jack | Top side | -15.2 | 24.3 | 9.5 mm (0.37 in) |
| Jack | Top side | 15.3 | 24.3 | 9.5 mm (0.37 in) |
Jig A covers 125B 2-Knob (Type 1)
Drop it over the enclosure, punch a mark through the holes this build uses, then lift it off and drill. It wraps onto the sides too, so the jacks and DC socket are covered.
Both jigs, $12 →