Loop btn
About the Loop btn PCB
Loop btn is an open source PCB design by usr-ein, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 109 × 34.1 mm, with 12 components from 9 distinct parts.
By type, the board carries 4 capacitors, 3 switches, 2 diodes, 2 resistors and 1 connector.
It belongs with the audio designs in this gallery.
From the project
Open source standalone DJ multimedia player, compatible with Rekordbox
A custom DJ media player — a CDJ-style deck — built from scratch around a Raspberry Pi, designed to run Mixxx DJ software. It reuses an original Pioneer CDJ's buttons and jog wheel behind custom PCBs and a 3D-printed chassis for an authentic DJ feel, and reads Rekordbox-formatted USB sticks — no laptop required.
The 1024×600 touchscreen runs a purpose-built Mixxx skin (mixxxconfig/TriMixxxskin). There is no mouse and no laptop: every control is either on the deck or under a thumb, so the UI is built around big targets and the browse encoder rather than around pointer precision.
Loop btn bill of materials (BOM)
12 components, 9 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LOOP | JST_XH_B7B-XH-AM_1x07_P2.50mm_Vertical_Etch | J6 |
| 1 | SW_START | SW_PUSH_6mm_H4.3mm | SW1 |
| 1 | SW_END | SW_PUSH_6mm_H4.3mm | SW2 |
| 1 | SW_RELOOP | SW_PUSH_6mm_H4.3mm | SW3 |
| 1 | P6SMB6.8CA LED_START | LED_D5.0mm | D1 |
| 1 | B5819W_C8598 LED_END | LED_D5.0mm | D2 |
| 3 | 100N 100n | C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2, C4 |
| 1 | C15195 10µ | C_Disc_D5.0mm_W2.5mm_P5.00mm | C3 |
| 2 | C11702 150 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
Loop btn design files
The KiCad project lives in the usr-ein/TriMixxx repository on GitHub; these links point at the commit this page was built from.
Loop btn: common questions
How big is the Loop btn PCB?
The Loop btn measures 109 × 34.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Loop btn?
12 components, from 9 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 Loop btn design files?
From the usr-ein/TriMixxx 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 Loop btn design in my own project?
Yes, under the terms of its GPL-3.0 license, which usr-ein chose for the repository.
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