I connected this to a 4.3 amp Fantastic RV fan to save energy. However now the motor whines at low speed at the PWM freq. How can I stop the noise?

You might cure that with a capacitor with a voltage rating higher than the supply voltage, and perhaps a capacity rating of 100 mfd. This capacitor type is polarity rated, so you would need to put it across the terminals going to the fan in way you are supplying the voltage. You would also have to be sure not to reverse the power to make the fan go the other direction. capacitor could probably be as low as 20 mfd. It can be placed anywhere in the line, or right at the fan. The capacitor should smooth out the chopping voltage. As scott says, it might not list to run on low power.

can this contoller switch be used for a razor motor scooter E 300 is 300 watts but if i put a 12 volt battery???

No. Your scooter will require a controller that will handle at least 25 amps (the formula is 300 watts, divided by 12 volts, equals 25 amps). This controller is rated at 3 amps continuous and 4 amps peak - at 12 volts that's only 36 watts continuous.

I want to build an electric scooter. Is this a good reverse and speed controler for a DC 12v motor and battery

Actually - No, not if it's something you want to ride on. The circuitry in this is simply not heavy duty enough to handle that kind of load or that large a motor. This circuit is intended for something on the order of a toy motor, no more than an amp or two at most.

Can anyone help me find a wiring diagram for this item please.

The third picture shows how to connect the power supply and the motor. That should be all you need.

Riorand Upgraded Adjustable Dc Motor Speed Pwm Controller 10v 12v

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Description

⚙️ Power Up Your Projects with Precision!

WIDE PWM RANGE - Adjust your PWM pulse width from 5% to 95% for ultimate control over your motor's performance.
PRECISION CONTROL - Enjoy a PWM frequency of 500 KHz for smooth and efficient motor speed adjustments.
UNLEASH YOUR POWER - Experience a maximum output of 80W for all your high-performance needs.
QUICK RESPONSE TIME - Short circuit time of less than 30 seconds ensures rapid adjustments and reliability.
VERSATILE VOLTAGE COMPATIBILITY - Compatible with DC voltages ranging from 10V to 30V, perfect for various applications.

The RioRand Upgraded Adjustable DC Motor Speed PWM Controller is a high-performance device designed for precise motor control. With a maximum power output of 80W, a PWM frequency of 500 KHz, and a versatile voltage range of 10V to 30V, this controller is perfect for a variety of applications. Its quick response time and wide PWM modulation range make it an essential tool for professionals seeking efficiency and reliability.

Reviews

R**.

Worked Perfectly!

This is quite a bit of electronics for the price. I used this to cut down the speed of a motor I use to drive a small rock polisher. It works perfectly. I really appreciated the graphics on Amazon that show how to wire it up as it did not come with instructions on how to wire it. But, as I said, there is a great picture on the Amazon page that clearly shows how to connect the wires.

18.11.2025

P**R

easy to install

works perfect, I limit the motor speed of a small 9-watt water pump in order to reduce or regulate the flow rate.

15.02.2026

C**C

Works well, smooth control

Using this to control a gear motor (also from Amazon) to run a model railroad turntable. It allows the turntable track to be accurately set in alignment with the approach tracks without the need for special indexing control circuits.

15.08.2025

S**N

It works and was delivered in a very timely fasion

4.06.2025

M**.

Makes loud hum unless in full power

4.06.2026

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RioRand Upgraded Adjustable DC Motor Speed PWM Controller 10V 12V 24V 30V Reversing Switch 120W

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