2 layers60 × 30 mm
Controller
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
11 parts3kApache-2.0
2 layers28.4 × 9.4 mm
Regulator pcb
shelxty/regulator_pcbSimple regulator PCB that converts a volatile 3.4 to 5V input to a stable 3.3V output; contains 2 LEDs that indicate when inputs are received and outputs are successful.
- Size
- 28.4 × 9.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 6
- Pads
- 23
- Tracks, vias
- 20, 15
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 18 Jun 2026
- Updated
- 25 Jun 2026
Overview
Regulator pcb is an open-source printed circuit board by shelxty, from the shelxty/regulator_pcb repository on GitHub. It is a 2-layer board of 28.4 × 9.4 mm with 11 parts on 6 nets, routed with 20 tracks and 15 vias.
Its parts include 3 capacitors, 2 resistors, 2 diodes, 2 connectors and 1 IC. It belongs with the power boards of this library.
README
README.md5V to 3.3V TPS79333 Regulator Board
After a lot of struggle with attempting to understand KiCad (thank you Hack Club Fallout mentors!) I made a simple linear voltage regulator to get started with learning, since this was a project simple enough to actually understand completely (schematic, PCB, everything). It's the first PCB I fully finished, designed in KiCad. I guess it can also be counted as my first actual electronics project!
This is a tiny breakout board that takes unregulated input voltage (anywhere between around 3.4V to 5V) and outputs clean, fixed 3.3V volts.
Custom Features
- Two LEDs: This board has a red LED that lights up when input power is applied, and a green LED that confirms the output rail is working and regulating the voltage.
- Feed-forward capacitor (C3): On the feedback path, a feed-forward capacitor is set to improve noise rejection.
- Compactness: Each part has a footprint of 0805 or smaller, meaning this regulator board is extremely tiny and portable.
...and a very bad drawing I impulsively drew.
How the Circuit Works (w/ Labels)
| Label | Part | What it Does |
|---|---|---|
| U1 | TPS79333 | The actual regulator, which drops the input voltage to a fixed output of 3.3V |
| J1 | 2-pin connector | The power input (it takes in unregulated voltage), with a ground pin |
| J2 | 2-pin connector | The power output (outputs a regulated 3.3V), with a ground pin |
| C2 | 2.2uF capacitor | Input decoupler (it smoothes out incoming supply before it gets to the regulator) |
| C1 | 0.1uF capacitor | Output decoupler (keeps the 3.3V rail stable should turbulence arise) |
| C3 | 0.01uF capacitor | Feed-forward capacitor (improves noise rejection, according to the TI reference design) |
| R2 | 280Ω resistor | Causes a 1.9V drop (3.3V - 1.9V) / 5mA = 280Ω |
| R1 | 649Ω resistor | Causes a 1.75V drop (5 - 1.75V) / 5mA = 650Ω |
| D1 | Red LED | Lights up when input voltage is applied |
| D2 | Green LED | Lights up when 3.3V voltage is successfully outputted |
PCB Design
This small regulator board is a 2 layer PCB with 2 sets of connectors.
PCB Editor View
Schematic Editor View (w/ comments & text for beginners to understand because I'm a complete beginner)
Bill of Materials
| Item | Description | Reference | Qty | MOQ | Value | Unit Price ($) | Total Price ($) | Footprint | MPN | URL |
|---|---|---|---|---|---|---|---|---|---|---|
| Capacitor | Output decoupler | C1 | 1 | 25 | 0.1uF | 0.0061 | 0.15 | Capacitor_SMD:C_0805_2012Metric | C0805B104K500NT | Link |
| Capacitor | Input decoupler | C2 | 1 | 10 | 2.2uF | 0.024 | 0.24 | Capacitor_SMD:C_0805_2012Metric | CL21B225KAFNNNE | Link |
| Capacitor | Feed-forward capacitor | C3 | 1 | 50 | 0.01uF | 0.0094 | 0.47 | Capacitor_SMD:C_0805_2012Metric | CL21B103KBANNNC | Link |
| Red & green LEDs | Lights up upon input | D1,D2 | 1 | 100 | LED-RED,LED-GREEN | 0.0143 | 1.43 | LED_SMD:LED_0805_2012Metric | Link | |
| 2-pin connector | Power input/output | J1,J2 | 2 | 10 | Conn_01x02 | 0.0191 | 1.91 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | Link | |
| Resistor | 649 Ohms | R1 | 1 | 100 | 649 | 0.001 | 0.1 | Resistor_SMD:R_0805_2012Metric | HRC0805F6490FNTN | Link |
| Resistor | 280 Ohms | R2 | 1 | 100 | 280 | 0.0031 | 0.31 | Resistor_SMD:R_0805_2012Metric | FRC0805F2800TS | Link |
| TPS79333 | Regulator | U1 | 1 | 5 | TPS79333-EP | 0.3 | 1.52 | Package_TO_SOT_SMD:SOT-23-5 | TPS79333DBVR | Link |
| PCB Fabrication | Producing PCB from JLCPCB | 1 | 2.2 | 2.2 | ||||||
| PCB Fabrication | Producing PCB from JLCPCB | 1 | 3.12 | 3.12 | ||||||
| Total | 11 | 11.45 |
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J2 |
| 1 | 0.01uF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 2.2uF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 280 | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | 649 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | LED-GREEN | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | LED-RED | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | LOGO | LOGO | G*** |
| 1 | TPS79333-EP | Package_TO_SOT_SMD:SOT-23-5 | U1 |
Questions
How big is the Regulator pcb PCB?
It measures 28.4 × 9.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Regulator pcb use?
11 parts. 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 Regulator pcb KiCad files?
From the shelxty/regulator_pcb repository on GitHub, at the commit this page was made from: the board is pcb/regulator_pcb.kicad_pcb and its schematic pcb/regulator_pcb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Regulator pcb design in my own project?
Its repository states no licence, so its author keeps all rights: ask shelxty before reusing the design.
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