Sliding Servo Tester Brushless ESC PWM Signal Generator Speed Controller

Sliding-Type Servo Tester & Brushless ESC Motor Speed Controller

Take precise control of your brushless motors, high-voltage servos, and DIY fan projects with this compact Sliding-Type Servo Tester and PWM Signal Generator. Featuring a smooth slider mechanism and wide 5–26V input voltage range, this controller eliminates the need for a voltage step-down module — making it an ideal solution for hobbyists, makers, and electronics enthusiasts alike. Made in Mainland China.

Key Features

• Wide Voltage Input: Accepts 5V to 26V DC — no voltage reduction required, compatible with a broad range of power sources.
• PWM Output Signal: Generates a clean PWM signal with a pulse duration of 1.5ms ± 0.5ms at 50Hz for reliable motor and servo control.
• Sliding Stroke Control: Approximately 1cm sliding stroke for intuitive, hands-on speed adjustment.
• Versatile Use Cases: Perfect for brushless ESC speed control, high-voltage servo testing, DIY small brushless fans, car wash machine speed regulation, and more.
• Compact & DIY-Friendly: Lightweight design fits easily into custom builds and DIY electronics projects.

Technical Specifications

Important Usage Notes

1. Not Waterproof: Keep away from moisture and wet environments to avoid damage.
2. No Auto-Return: The slider does not return to its original position automatically — manual repositioning is required.
3. One-Way Motors Recommended: This controller is optimized for single-direction motor control. While it can operate two-way motors (slider center = stop; forward/backward = motor direction), the lack of a return-to-center function makes stopping less convenient for bidirectional applications.
4. Throttle Calibration: If the motor fails to start, perform a throttle travel calibration: slide to maximum, power on, wait ~5 seconds, then slide to minimum. Upon hearing the prompt sound, calibration is complete.

What's in the Box

• 1× Brushless Electronic Speed Controller (Sliding Servo Tester / PWM Generator)

Please Note

• Colors may vary slightly from images due to lighting and screen differences.
• Please allow 1mm–1cm tolerance due to manual measurement.

For more information on safe electronics handling and DIY electrical safety standards, visit the U.S. Consumer Product Safety Commission (CPSC).

Frequently Asked Questions

Q: What is a PWM signal generator and what does this brushless ESC servo tester do?

A: A PWM (Pulse Width Modulation) signal generator produces timed electrical pulses that control the speed of brushless motors or the position of servo motors. This sliding-type tester outputs a 50Hz PWM signal with a 1.5ms ± 0.5ms pulse duration, letting you manually adjust motor speed or test servo response using a simple slider — no external transmitter or receiver required.

Q: What voltage range does this motor speed controller support?

A: This controller supports a wide input voltage range of 5V to 26V DC, meaning it works with most standard RC battery packs, bench power supplies, and DIY power sources without requiring an additional voltage step-down regulator.

Q: Can I use this servo tester for two-way (bidirectional) motors?

A: Technically yes — the center slider position acts as a stop, with forward and backward slider movement controlling motor direction. However, because the slider does not automatically return to center, stopping the motor mid-operation requires manual adjustment, which can be inconvenient. For best results, this controller is recommended for single-direction (one-way) brushless motor applications.

Q: How do I perform the throttle travel calibration if my motor won't start?

A: Slide the controller to its maximum position, then power on the system and wait approximately 5 seconds. Then, slide the controller to the minimum position. When you hear the calibration prompt tone, the throttle travel calibration is complete and your motor should now start correctly from the minimum position.