Fingerprint Sensor AS608 - A Beginner's Guide
One touch can replace keys. This project uses an optical fingerprint sensor to enroll users and then grant access with a quick scan.
read tutorial →
Stable 9V Power for Embedded Builds
The 9V, 2.9A Step-Down Voltage Regulator D30V30F9 is a compact switching regulator for projects that need a lower and more stable DC rail from a higher input source.
It is a strong fit for robots, control boxes, battery-powered builds, and embedded systems that need efficient power conversion with less heat than a linear regulator.
Important: Choose a regulator based on your full input-voltage range, startup current, thermal limits, and required headroom. Real output current depends on input voltage, airflow, and temperature.
Why you'll love it
- 9V sensor / radio / audio rails from 12V–24V supplies
- Robotics power (servos/logic rails that need stable 9V)
- Portable rigs where efficiency + heat control matter
- Projects that want enable/sleep control + a power-good signal
- Efficient 9V from high input: switching regulator design reduces heat vs linear regulators
- Enable / sleep control: disconnect load and enter low-power mode (great for battery builds)
What you can build
Great for powering 5V or 12V rails in robots, controllers, sensor hubs, SBC projects, vehicle electronics, and custom battery systems.
Compare regulator options
| Model | Topology | Output | Max current |
|---|---|---|---|
| D24V22F12 | Buck | 12 V | 2.2 A |
| D36V28F12 | Buck | 12 V | 2.4 A |
| D24V22F5 | Buck | 5 V | 2.5 A |
| D30V30F9 | Buck | 9 V | 2.9 A |
| D36V28F5 | Buck | 5 V | 3.2 A |
| D30V30F5 | Buck | 5 V | 3.4 A |
| D42V55F12 | Buck | 12 V | 4.5 A |
Technical specifications
| Product | 9V, 2.9A Step-Down Voltage Regulator D30V30F9 |
|---|---|
| Brand | Pololu |
| Model | D30V30F9 |
| Category | DC-DC Step-Down Regulator |
| Topology | Step-Down (Buck) |
| Output Voltage | 9 V |
| Max Current | 2.9 A |
| Operating Voltage | 9-45 V |
| Support | Official Pololu product search and support resources linked below |
Official resources
Find this product on Pololu | Pololu support and resources
What’s in the box
1 × 9V, 2.9A Step-Down Voltage Regulator D30V30F9
Frequently Asked Questions
Can I power a microcontroller with this?
Yes, if the regulator’s output voltage and current match your controller and all attached loads.
Yes, if the regulator’s output voltage and current match your controller and all attached loads.
Will it run cool at full load?
It depends on input voltage, airflow, and load current. Check thermal limits in the official Pololu resources.
It depends on input voltage, airflow, and load current. Check thermal limits in the official Pololu resources.
Is this better than a linear regulator?
For many builds, yes. Switching regulators are usually more efficient and waste less heat.
For many builds, yes. Switching regulators are usually more efficient and waste less heat.
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
Compatibility & downloads
// downloads
Customers also bought
Build with this board
Thumb Joystick - A Beginner's Guide
Wire a joystick to your Arduino, read X/Y, then print UP / DOWN / LEFT / RIGHT to the serial monitor.
read tutorial →Motor Drive (BTS7960 43A) - A Beginner's Guide
Bench-test a 43 A motor driver before wiring the full project. Catches weak power, mis-pinning, and dead boards before they cost you time.
read tutorial →Raspberry Pi Pico (RP2040) - A Beginner's Guide
Coming from UNO and the Pico won't show a COM port? Here's the BOOTSEL trick, the driver fix, and the first sketch that actually works.
read tutorial →Notes from the bench
Ask the community
Project Showcase — show what you built
Share what you built. Photos, BOM, what worked, what didn't.
view thread →How to ask a good question (and actually get answers)
Symptom + what you tried + clear photo = answers within hours.
view thread →ESP32 brownout when wiring a sensor — fixes that worked
Brownout reset when adding a sensor? Notes on supply decoupling and GPIO checks.
view thread →First Arduino — sketch upload error, what to try?
Upload failing on your first Uno? Driver, COM port, board match — checklist inside.
view thread →