2 layers104 × 60 mm
UTAC PCB
X-zeed/UTAC-PCB
4-channel smart relay control board with ESP32-C3 SuperMini - KiCad PCB Design v0.2.0
59 parts2
2 layers38 × 26 mm
Single CH Relay
ampnics/Relay-Module-HW-Design25V single channel relay module
- Size
- 38 × 26 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 10
- Nets
- 9
- Pads
- 24
- Tracks, vias
- 49, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Nov 2025
- Updated
- 15 Nov 2025
Overview
Single CH Relay is an open-source printed circuit board by ampnics, from the ampnics/Relay-Module-HW-Design repository on GitHub. It is a 2-layer board of 38 × 26 mm with 10 parts on 9 nets, routed with 49 tracks and 0 vias.
It is built around the MMBT2222A and MRA4003T3G-MS. Its parts include 3 resistors, 2 diodes, 2 connectors, 1 transistor and 1 switch. It belongs with the home automation and IoT boards of this library.
Main components
2Parts
10| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10K | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 1 | 1K | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal | J1 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | MMBT2222A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | MRA4003T3G | Diode_SMD:D_SMA | D1 |
| 1 | SANYOU_SRD_Form_C | Relay_THT:Relay_SPDT_SANYOU_SRD_Series_Form_C | K1 |
| 1 | Screw_Terminal_01x03 | TerminalBlock:TerminalBlock_bornier-3_P5.08mm | J2 |
The 9 most common of 10 parts.
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Questions
How big is the Single CH Relay PCB?
It measures 38 × 26 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Single CH Relay use?
10 parts, built around the MMBT2222A and MRA4003T3G-MS. 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 Single CH Relay KiCad files?
From the ampnics/Relay-Module-HW-Design repository on GitHub, at the commit this page was made from: the board is Single-CH-Relay.kicad_pcb and its schematic Single-CH-Relay.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Single CH Relay design in my own project?
Its repository states no licence, so its author keeps all rights: ask ampnics before reusing the design.