How does a PWM controller differ from a simple voltage regulator?

A PWM (Pulse Width Modulation) controller regulates speed by rapidly turning the power on and off, rather than dropping the voltage like a traditional resistor. This method is vastly superior because it allows the DC motor to maintain high torque and efficiency even when running at very low speeds (e.g., 5%).

Can I use this controller to dim 12V or 24V LED lights?

Yes, this PWM Motor Speed Controller works perfectly as a heavy-duty dimmer switch for single-color 12V or 24V LED strips. The high-frequency PWM signal will smoothly dim the LEDs from 5% to 100% brightness without causing visible flickering or color shifting.

What happens if I accidentally wire the power input backward?

If you wire the power input backward, the controller will be instantly and permanently damaged. This module does not feature reverse polarity protection, so you must use a multimeter to verify your positive (POWER+) and negative (POWER-) wires before applying any voltage.

Does the rotary knob completely turn off the power to the motor?

Yes, the B100K potentiometer features a built-in mechanical switch. When you turn the knob fully counter-clockwise past the 5% mark, it will "click" and completely cut the electrical circuit, stopping the motor without needing an external toggle switch.

Can I get advice on wiring this controller to my CNC machine at your store?

Yes, you can bring your wiring diagrams to Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po for expert technical advice. Our staff can help you verify your power supply voltage and ensure your CNC spindle motor does not exceed the 10A maximum limit.

10A PWM DC Motor Speed Controller 12V-24V

Name: 10A PWM DC Motor Speed Controller 12V-24V | DIY Dimmer Switch
Brand: Sun Cheong Computer Company Limited
SKU: 21PS002674
Price: 25.0 HKD
Availability: InStock

Short Product Description

The 12V-30V 10A PWM DC Motor Speed Controller is a high-efficiency power regulator designed for DIY robotics, CNC machines, and custom LED lighting. Featuring a B100K potentiometer with a built-in click-off switch, this module provides smooth, stepless speed adjustment from 5% to 100% while handling up to 10A of peak current. Available for instant pickup at Sun Cheong Computer Co. Ltd.(新昌電腦有限公司) in Sham Shui Po, our technical staff can provide expert advice on integrating this PWM dimmer into your specific 12V or 24V STEM projects.

Key Features

Stepless Speed Adjustment: Smoothly regulates DC motor speed from 5% to 100% using high-efficiency Pulse Width Modulation (PWM).
Integrated Power Switch: The rotary knob includes a tactile click mechanism to completely shut off power when turned fully counter-clockwise.
High Current Capacity: Supports a rated continuous current of 7A and can handle peak loads up to 10A for heavy-duty applications.
Robust Thermal Design: Features a thick aluminum heatsink to dissipate heat efficiently during continuous high-power operation.
Solderless Installation: Equipped with a 4-pin screw terminal block (POWER-, POWER+, MOTOR+, MOTOR-) for quick and secure wire connections.
Wide Voltage Range: Compatible with any DC power source between 12V and 30V, making it highly versatile for various DIY projects.

Full Product Description

Precise PWM Speed Control for DIY Robotics

This PWM DC Motor Speed Controller utilizes Pulse Width Modulation (PWM) to adjust the speed of your motors without sacrificing torque at low RPMs. Whether you are building a custom robotic rover, a variable-speed ventilation fan, or a motorized camera slider, this module translates your 12V to 30V DC power into smooth, controllable mechanical motion. By turning the rotary knob, you can seamlessly scale the output from a slow 5% crawl up to 100% full power, giving you absolute precision over your mechanical builds.

High-Efficiency 10A Power Handling

Built to withstand demanding electrical loads, this Adjustable Speed Regulator safely handles a rated continuous current of 7A and a maximum peak current of 10A. The PCB is equipped with three high-capacity capacitors and a dedicated aluminum heatsink mounted directly to the power MOSFETs. This robust thermal design ensures the controller remains cool and stable even when driving power-hungry 24V industrial motors or long strips of high-wattage LEDs for extended periods.

Built-in Switch & Easy Screw Terminal Wiring

The integrated B100K potentiometer features a tactile "click-off" mechanism, allowing you to completely cut power to the motor by turning the knob below the 5% threshold without needing a separate power switch. Wiring the module is incredibly straightforward thanks to the clearly labeled 4-pin screw terminal block on the back. You simply insert your stripped wires into the designated POWER (+/-) and MOTOR (+/-) slots and tighten them with a small screwdriver for a secure, solder-free connection.

Pro Tip from Our Technicians

When wiring this PWM Motor Controller, our Sham Shui Po technical team strongly warns you to double-check your power supply polarity before turning it on. This specific module does not have reverse polarity protection; connecting the positive and negative power inputs backward will instantly destroy the onboard chips. Additionally, while designed for motors, this PWM board is also an excellent, flicker-free dimmer switch for 12V/24V single-color LED light strips!

Technical Specifications

Product Type: PWM DC Motor Speed Controller
Input Voltage Range: DC 12V - 30V
Applicable Current: Rated 7A (Maximum Peak 10A)
Speed Adjustment Range: 5% - 100%
Control Mechanism: B100K Potentiometer (with built-in OFF switch)
Cooling System: Integrated Aluminum Heatsink
Wiring Interface: 4-Pin Screw Terminal Block
PCB Dimensions: 50mm x 32mm
Knob Dimensions: 14mm diameter x 16mm length
Net Weight: 32g

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

How does a PWM controller differ from a simple voltage regulator?A PWM (Pulse Width Modulation) controller regulates speed by rapidly turning the power on and off, rather than dropping the voltage like a traditional resistor. This method is vastly superior because it allows the DC motor to maintain high torque and efficiency even when running at very low speeds (e.g., 5%).
Can I use this controller to dim 12V or 24V LED lights?Yes, this PWM Motor Speed Controller works perfectly as a heavy-duty dimmer switch for single-color 12V or 24V LED strips. The high-frequency PWM signal will smoothly dim the LEDs from 5% to 100% brightness without causing visible flickering or color shifting.
What happens if I accidentally wire the power input backward?If you wire the power input backward, the controller will be instantly and permanently damaged. This module does not feature reverse polarity protection, so you must use a multimeter to verify your positive (POWER+) and negative (POWER-) wires before applying any voltage.
Does the rotary knob completely turn off the power to the motor?Yes, the B100K potentiometer features a built-in mechanical switch. When you turn the knob fully counter-clockwise past the 5% mark, it will "click" and completely cut the electrical circuit, stopping the motor without needing an external toggle switch.
Can I get advice on wiring this controller to my CNC machine at your store?Yes, you can bring your wiring diagrams to Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po for expert technical advice. Our staff can help you verify your power supply voltage and ensure your CNC spindle motor does not exceed the 10A maximum limit.

Target Users / Applications

STEM Robotics Builders: Controlling the exact driving speed of 12V geared DC motors in custom remote-controlled rovers or robotic arms.
Custom PC & Server Modders: Manually regulating the speed of high-RPM 12V industrial cooling fans to balance airflow and noise levels.
Van Life & RV Enthusiasts: Creating heavy-duty, flicker-free dimming circuits for 12V/24V interior LED cabin lighting.

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12V-30V 10A PWM DC Motor Speed Controller | Adjustable Regulator Switch