4 layers33.5 × 15 mm
4 layers37.6 × 112.5 mm
Slow LFO-8HP Carrier RevB 2350
actuallysparky/SloLFO1Slow Eurorack LFO and VCV Rack prototype by Bearamin
- Size
- 37.6 × 112.5 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 41
- Nets
- 32
- Pads
- 129
- Tracks, vias
- 264, 0
- Pours
- 95
- Routed
- Yes
- KiCad
- KiCad 10.99 (file 20260831)
- Created
- 28 Sep 2026
- Updated
- 22 Oct 2026
Overview
Slow LFO-8HP Carrier RevB 2350 is an open-source printed circuit board by actuallysparky, from the actuallysparky/SloLFO repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 37.6 × 112.5 mm with 41 parts on 32 nets, routed with 264 tracks and 0 vias.
It is built around the R-78B5.0-1.0. Its parts include 21 resistors, 9 capacitors, 4 connectors, 3 ICs and 3 diodes. It belongs with the RP2350 boards of this library.
Main components
1README
hardware/README.mdHardware
Slow-LFO-8HP-Carrier-RevB_2350.kicad_pcb and Slow-LFO-8HP-Faceplate_8x8.kicad_pcb are the RP2350/8×8 carrier and faceplate designs. SlowLFO.pretty contains the custom footprints referenced by the carrier, and fp-lib-table points KiCad to that directory.
The boards are the current design files in this private development repository. The carrier has open electrical and fit work; fabrication and validation are the next hardware milestones. See RP2350 fork notes and the functional specification for the pin map and circuit design.
Open either PCB in KiCad to inspect or continue the layout. The matching RP2350 firmware source is in ../firmware/.
Parts
41| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10uF | SlowLFO:CP_Radial_D5.0mm_P2.00mm_CenterLabel | C2, C3, C4, C5, C8 |
| 4 | 10k | SlowLFO:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical_CenterLabel | R19, R20, R21, R22 |
| 4 | 3k3 | SlowLFO:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical_CenterLabel | R1, R2, R6, R7 |
| 3 | 12k | SlowLFO:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical_CenterLabel | R3, R8, R11 |
| 3 | 1N5819 | Diode_THT:D_DO-41_SOD81_P2.54mm_Vertical_AnodeUp | D1, D2, D3 |
| 3 | 330R | SlowLFO:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical_CenterLabel | R5, R10, R13 |
| 3 | 5k76 | SlowLFO:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical_CenterLabel | R4, R9, R12 |
| 2 | 100nF | SlowLFO:C_Disc_D5.0mm_W2.5mm_P5.00mm_CenterLabel | C6, C7 |
| 1 | 0.33F 9V | SlowLFO:SCMR14L334SRBB0 | C11 |
| 1 | 10R >=3W pulse | SlowLFO:ChargeResistor_3W | R18 |
| 1 | 10k5 | SlowLFO:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical_CenterLabel | R14 |
| 1 | 10pin IDC keyed | Connector_IDC:IDC-Header_2x05_P2.54mm_Latch_Vertical | J1 |
| 1 | 2u2 X7R 25V | SlowLFO:C410_Aximax_Axial_Vertical_P2.50mm_HandFormed | C9 |
| 1 | 30k1 | SlowLFO:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical_CenterLabel | R15 |
| 1 | 3k3 | SlowLFO:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical_CenterLabel | R16 |
| 1 | A/B/C plus switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm_CircularMountingHoles | ENC1 |
| 1 | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | SlowLFO:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_J4 | J4 |
| 1 | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | SlowLFO:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_J3 | J3 |
| 1 | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | SlowLFO:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_J2 | J2 |
| 1 | R-78B5.0-1.0 | SlowLFO:RECOM_R78B5.0_Rear | U2 |
| 1 | RP2350-Matrix | SlowLFO:RP2350-Matrix_8x8_THT | U1 |
| 1 | TL074 | Package_DIP:DIP-14_W7.62mm | U3 |
Questions
How big is the Slow LFO-8HP Carrier RevB 2350 PCB?
It measures 37.6 × 112.5 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Slow LFO-8HP Carrier RevB 2350 use?
41 parts, built around the R-78B5.0-1.0. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Slow LFO-8HP Carrier RevB 2350 KiCad files?
From the actuallysparky/SloLFO repository on GitHub, at the commit this page was made from: the board is hardware/Slow-LFO-8HP-Carrier-RevB_2350.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Slow LFO-8HP Carrier RevB 2350 design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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