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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⚙️ Master your motor’s pace and direction like a pro — don’t get left behind!

COMPACT DURABLE DESIGN - Ultra-soft, heat-resistant silicone wiring and a sleek, pocket-sized controller built to last.
PLUG AND PLAY SIMPLICITY - Easy wiring with clear LED feedback ensures you’re up and running in no time.
REVERSIBLE MOTOR DIRECTION - Instantly switch motor rotation forward or backward for ultimate control.
PRECISION PWM SPEED CONTROL - Effortlessly dial your motor speed with smooth, noise-free PWM technology.
VERSATILE VOLTAGE COMPATIBILITY - Supports a broad 6-28V DC range to power diverse motor projects with ease.

The RioRand 1203BB DC Motor Speed Controller offers precise PWM-based speed adjustment and reversible control for brushed DC motors within 6-28V and up to 3A current. Its compact, durable design with heat-resistant wiring makes it ideal for professional and DIY motor projects requiring reliable, smooth speed regulation.

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UPC	637012217609
Global Trade Identification Number	00637012217609
Manufacturer	RioRand
Model number	RR-PWM-3A
Number of Memory Sticks	1
Item Weight	30 g
Product Dimensions	5.08 x 3.3 x 1.02 cm; 30 g
Item model number	RR-PWM-3A
Item Height	0.4 Inches
Item Width	1.3 Inches
Power Source	Corded Electric
Included Components	1 x RioRand dc motor speed controller
Are batteries included?	No

RioRand 6V 12V 24V 28V 3A 80W DC Motor Speed Controller PWM Speed Adjustable Reversible Switch 1203BB DC Motor Driver Reversing

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