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

⚙️ Master your motor’s rhythm with precision and power!

COMPACT YET MIGHTY - Lightweight 70g design fits seamlessly into any project without bulk
RAPID RESPONSE TIME - Short circuit protection activates in under 30 seconds for safe, reliable operation
POWER YOUR PRECISION - Supports DC 10V-30V with up to 80W output for versatile motor control
CONTROL AT THE SPEED OF LIGHT - High-frequency 500 KHz PWM ensures ultra-smooth and responsive speed adjustments
FLIP THE SWITCH CHANGE THE DIRECTION - Integrated reversing switch lets you effortlessly toggle motor rotation

The RioRand Upgraded Adjustable DC Motor Speed PWM Controller delivers precise motor speed control across a wide voltage range (10V-30V) with a robust 80W power capacity. Featuring a high-frequency 500 KHz PWM for smooth modulation and a reversing switch for bidirectional operation, this compact 70g device ensures rapid response and reliable protection, making it an essential tool for professionals seeking efficient and versatile motor management.

Reviews

D**D

Perfect for Model Railroading

I bought this to make my own handheld N scale throttle (old school DC) I put it in a very old Radio Shack experiment box. It works perfect and center off switch is really nice when doing slow speed switching

17.04.2026

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

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

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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