Will this work for a 2 phase 4 wire stepper motor?

The stepper motors work well if they are connected to drivers and with arduino and the speed can be varied, but directly connected to a speed control I have not done it before.

How do you make fan run in reverse

Well if it is a fan like those used by computers, they only have one direction where the air blows and to put them in reverse so that it blows in the opposite direction, simply turn it around. But DC motors positive and negative connection can turn in either direction clockwise or counter clockwise and can be easily controlled by inverting the polarity of the applied voltage so this motor speed controller can be used it.

can this be used as a dimmer for 24 volt LED strip?

yes of course you can use it like this too but this is limited for the current of several 16 feet led strip lights, I recommend you better use a DC12-24 30A dimmer for better results, you can buy it on ebay for $12

What size gauge wire would I use to wire this to a 775 motor

Size on the board: 32mm*15mm*50mm, what type of line do you need to connect

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⚡ Take control of your motor’s speed and direction like a pro!

COMPACT LIGHTWEIGHT - Small footprint (3.2x5x1.5 cm) and featherlight design (1.13 oz) fit seamlessly into any project.
DURABLE SAFE WIRING - Ultra-soft, high-temp silicone rubber wires ensure long-lasting, safe connections.
PRECISION SPEED CONTROL - PWM technology delivers smooth, efficient motor speed adjustments up to 80W power.
EFFORTLESS DIRECTION SWITCHING - Integrated forward/reverse switch lets you instantly change motor rotation with ease.
VERSATILE VOLTAGE COMPATIBILITY - Supports a broad 6V to 28V DC input range, perfect for various low-voltage gear motors.

The RioRand Small PWM DC Motor Speed Controller is a compact, high-performance device designed for low-voltage brushed DC motors. Operating within 6-28V DC and supporting up to 3A continuous current, it offers precise PWM speed control and a convenient forward/reverse switch. Built with durable silicone wiring and a sleek form factor, it’s ideal for professionals seeking reliable motor management in compact spaces.

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UPC	637012217609
Global Trade Identification Number	00637012217609
Manufacturer	RioRand
Part Number	RR-PWM-3A
Item Weight	1.06 ounces
Product Dimensions	2 x 1.3 x 0.4 inches
Item model number	RR-PWM-3A
Finish	Motor speed controller
Item Package Quantity	1
Included Components	1 x RioRand dc motor speed controller
Batteries Included?	No
Batteries Required?	No

RioRand Small PWM DC Motor Speed Controller - for 6V 12V 24V 28V 3A 80W Low-Voltage Gear Motors with Forward/Reverse Switch Control

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