2 layers100 × 69 mm
2 layers47.5 × 28 mm
Loop switch
yagcioe/loop_switchThe circuit operates on a standard 9–12 V DC power supply and includes protection and signal conditioning stages to ensure reliable and clean performance.
- Size
- 47.5 × 28 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 25
- Nets
- 19
- Pads
- 74
- Tracks, vias
- 177, 20
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 5 Jun 2026
- Updated
- 7 Jun 2026
Overview
Loop switch is an open-source printed circuit board by yagcioe, from the yagcioe/loop_switch repository on GitHub. It is a 2-layer board of 47.5 × 28 mm with 25 parts on 19 nets, routed with 177 tracks and 20 vias.
It is built around the CD4053BE and NMJ4HCD2. Its parts include 8 resistors, 7 capacitors, 2 ICs, 2 connectors and 1 diode.
Main components
2README
README.mdModular Guitar Effect Loop Switch
KiCad Project & LT Spice Schematic
Overview
This project is a modular switch circuit designed for guitar effect loops. It allows flexible routing of audio signals while maintaining signal integrity and minimizing noise. The design is suitable for pedalboards or custom-built switching systems.
The circuit operates on a standard 9–12 V DC power supply and includes protection and signal conditioning stages to ensure reliable and clean performance.
Features
- Modular design for flexible chaining of multiple loops
- Supports 9–12 V DC input
- Reverse polarity protection to prevent damage from incorrect power connection
- Power supply ripple filtering for reduced noise
- Low impedance output buffer for improved signal stability and drive capability
- Designed for use with guitar-level signals
- connector for an external indicator Led when the Loop is active
- BOM includes links to the respective Digikey item
- PCB is mounted directly on the 1/4" (6.3mm) send and return Jacks of the effect loop
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R7 |
| 4 | 1u | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C5, C6, C7, C8 |
| 4 | Conn_01x02_Socket | Connector_Wire:SolderWire-0.5sqmm_1x02_P4.6mm_D0.9mm_OD2.1mm | IN1, LED1, OUT1, SW1 |
| 2 | 100u | Capacitor_SMD:CP_Elec_6.3x5.7 | C1, C3 |
| 2 | 1M | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R8 |
| 2 | NMJ4HCD2 | Connector_Audio:Jack_6.35mm_Neutrik_NMJ4HCD2_Horizontal | J1, J2 |
| 1 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4 |
| 1 | 4k7 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | Barrel_Jack | Connector_Wire:SolderWire-0.5sqmm_1x02_P4.6mm_D0.9mm_OD2.1mm | 9V1 |
| 1 | CD4053B | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U2 |
| 1 | D_Schottky | Diode_SMD:D_SOD-323_HandSoldering | D1 |
| 1 | OPA1692xD | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
Questions
How big is the Loop switch PCB?
It measures 47.5 × 28 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Loop switch use?
25 parts, built around the CD4053BE and NMJ4HCD2. 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 Loop switch KiCad files?
From the yagcioe/loop_switch repository on GitHub, at the commit this page was made from: the board is loop_switch.kicad_pcb and its schematic loop_switch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Loop switch design in my own project?
Its repository states no licence, so its author keeps all rights: ask yagcioe before reusing the design.
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