HardLabs

Under-Pressure

catalinacatalinacatalina·Under-Pressure·hardware/KiCad/under_pressure/under_pressure.kicad_pcb

Under-Pressure PCB layout, top view — open source board by catalinacatalinacatalina

About the Under-Pressure PCB

Under-Pressure is an open source PCB design by catalinacatalinacatalina, published on GitHub under the MIT license. It is a 2-layer board measuring 74 × 44.5 mm, with 30 components from 18 distinct parts.

Other key parts include the TL072. By type, the board carries 12 capacitors, 10 resistors, 2 ICs, 2 connectors, 2 diodes and 1 battery holder.

It belongs with the audio and dev boards & breakouts designs in this gallery.

From the project

DIY analog overdrive pedal inspired by a Wampler design. First prototyped on breadboard and later transferred to PCB using KiCad.

A complete documentation of designing and building an analog distortion pedal for electric guitars, based on Brian Wampler's minimal parts-count circuit design.

Under Pressure is named after the iconic 1981 song by David Bowie & Queen. The name captures the essence of what a distortion pedal does: it takes the natural dynamics of a guitar signal and compresses it under intense pressure, forcing it through clipping stages that create the characteristic aggressive and driven tone.

Under-Pressure, from the project README
From the project README

Main components on the Under-Pressure

TL072

Under-Pressure bill of materials (BOM)

30 components, 18 distinct parts.

QtyPartRefs
2
TL072
U1, U2
1
input
J1
1
output
J3
1
Battery
BT2
1
100kΩ
RV1
2
LED
D1, D2
2
47µF
C1, C3
4
22nF
C2, C8, C11, C13
1
680nF
C5
2
100pF
C6, C9
1
50nF
C7
2
0.47µF
C10, C12
2
1MΩ
R1, R5
4
10kΩ
R2, R4, R6, R7
1
2.2kΩ
R8
1
4.7kΩ
R11
1
680kΩ
R12
1
1kΩ
R13

Under-Pressure design files

The KiCad project lives in the catalinacatalinacatalina/Under-Pressure repository on GitHub; these links point at the commit this page was built from.

Under-Pressure: common questions

How big is the Under-Pressure PCB?

The Under-Pressure measures 74 × 44.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Under-Pressure?

30 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the Under-Pressure design files?

From the catalinacatalinacatalina/Under-Pressure repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Under-Pressure design in my own project?

Yes, under the terms of its MIT license, which catalinacatalinacatalina chose for the repository.

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