MOSFET Driver Drill Template
PedalPCB · 125B
Template details
- Circuit
- MOSFET Driver
- Vendor
- PedalPCB
- Enclosure
- Hammond 125B
- Dimensions
- 63.6 × 119.3 × 35.8 mm
- Layout
- 125B 4-Knob (Type 1)
- Category
- Overdrive
Export formats
- PDF: print at 1:1 scale
- SVG: vector graphic
About this drill template
Drill template for the PedalPCB MOSFET Driver, 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 4-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 BK Butler Tube Driver”
A MOSFET-based take on the BK Butler Tube Driver, the overdrive associated with David Gilmour and Eric Johnson. Drive and Volume set gain and output while Hi and Lo shape treble and bass independently for an amp-like drive.
Rich, harmonically full overdrive with a wide, amp-like EQ range and smooth sustain.
Build notes
Four-knob layouts give you room for an extra parameter (a presence control, a blend pot, or an active EQ band) without crowding the footswitch.
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
- Hi: Adjusts the treble content
- Lo: Adjusts the bass content
- Drive: Controls the amount of gain
- Volume: Controls the overall output volume
Drill measurements
Hole centres for the 125B 4-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 | 25.4 | 6.4 mm (0.25 in) |
| Pot | Enclosure face | -16.5 | 12.7 | 7 mm (0.28 in) |
| Pot | Enclosure face | 16.5 | 12.7 | 7 mm (0.28 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 4-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 →