Lower
About the Lower PCB
Lower is an open source PCB design by Chrismettal, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 52 × 40 mm, with 18 components from 13 distinct parts.
Other key parts include the TL072. By type, the board carries 6 resistors, 5 capacitors, 3 connectors, 1 IC, 1 transistor and 1 switch.
It belongs with the audio and test & measurement designs in this gallery.
From the project
Complete audio effect stompbox ecosystem and collection of designs
This is a convenient system for quickly creating stompboxes, as well as a collection of designs made with this system.
The design is split into two boards, a lower and an upper one. The lower PCB handles all of the I/O, switching, and power stuff, while the upper one focuses on the individual effect. The two boards plug together and fit neatly inside a commonly used Hammond 1590B. For each finished design there is also a PCB frontpanel so I don't have to deal with any actual design work and can just hide my designs behind technical looking stuff. The actual boards take full advantage of…
Main components on the Lower
Lower bill of materials (BOM)
18 components, 13 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TL072 | SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | AO3401A | SOT-23 | Q1 |
| 2 | AUDIOJACK3 AudioJack3 | Audio_Jack_PJ-602B | J1, J2 |
| 1 | Barrel_Jack | DC_Barrel_Jack_Thinline_Wired_Standing | J3 |
| 1 | SW_PUSH_3PDT SW_Push_3PDT | Footswitch_3PDT | SW1 |
| 1 | LED | LED_D5.0mm | D1 |
| 1 | 100UF 100uF | CP_Radial_D5.0mm_P2.00mm | C1 |
| 3 | 220NF 220nF | C_0603_1608Metric | C2, C4, C5 |
| 1 | 10UF 10uF | C_0805_2012Metric | C3 |
| 1 | 390R | R_0603_1608Metric | R1 |
| 1 | 2K2 2k2 | R_0603_1608Metric | R2 |
| 2 | 1M | R_0603_1608Metric | R3, R4 |
| 2 | 2M2 | R_0603_1608Metric | R5, R6 |
Lower design files
The KiCad project lives in the Chrismettal/PedalDev repository on GitHub; these links point at the commit this page was built from.
Lower: common questions
How big is the Lower PCB?
The Lower measures 52 × 40 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Lower?
18 components, from 13 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Lower design files?
From the Chrismettal/PedalDev repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Lower design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which Chrismettal chose for the repository.
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