I cannot get this to work with a 3.5~9v dc pump (which can be controlled via an inline usb unit similar to this). what resistor is tied to the pot?

It is a PWM. It should work with a DC motor in most instances.

What size hole for the shaft?

Need more information about the shaft.

I need to adjust output voltage 0-5vdc (to motor) using 15vdc in (power), will this do that ?

This cannot be done. This is just a speed-regulating motor with a maximum current of 2A. If the continuous current exceeds 0.5A, it won't work. It is not recommended to connect with a voltage exceeding 12v, which may cause damage to the controller

Can this work as a dc light dimmer?

It should work ok as a low voltage dimmer. Probably OK for LEDs

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10pcs 1803BK Low Voltage DC Motor Adjustable w/Speed Control Knob

10pcs 1803BK Low Voltage DC Motor Adjustable w/Speed Control Knob

Product ID: 114286017

Details

Brand
Onyehn
Color
Green
Contact Type
Spdt
Current Rating
2 A
Voltage
15

⚡2A max continuous current

🔄0%-100% PWM duty cycle control

🔋1.8V-15V DC input voltage range

E£ 2849

Duties & taxes included

In stock

Sold byAmazon EGYPTDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Master your motor’s pace — control with confidence and style!

BUILT IN SAFETY FUSE - Self-recovery 2A fuse protects your projects from overloads automatically.
POWER ON LED INDICATOR - Instant visual confirmation that your controller is active and ready.
PRECISION SPEED CONTROL - Smoothly adjust motor speed from zero to full throttle with a tactile knob.
COMPACT DURABLE DESIGN - Metal and plastic build fits neatly into any DIY or professional setup.
WIDE VOLTAGE COMPATIBILITY - Supports low voltage DC motors from 1.8V up to 15V for versatile applications.

This 10-pack of Onyehn 1803BK PWM DC motor speed controllers offers precise, adjustable speed regulation for low voltage motors (1.8V-15V DC) with a max continuous current of 2A and 30W power. Featuring a self-recovery fuse for overload protection, a power-on LED, and a user-friendly potentiometer knob, these compact controllers are ideal for DIY projects, STEM kits, and professional automation tasks requiring reliable, safe motor speed management.

Specifications

ASIN	B07NPJ5MQR
Best Sellers Rank	#263,816 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #167 in Electrical Motor Controls
Brand Name	Onyehn
Circuit Type	series
Color	Green
Connector Type Used on Cable	None Required
Contact Type	Spdt
Control Type	Manual
Current Rating	2 A
Customer Reviews	4.4 4.4 out of 5 stars (194)
Item Dimensions L x W x H	1.26"L x 1.26"W x 0.59"H
Item Weight	78 g
Manufacturer	Onyehn
Material Type	Metal, Plastic
Model	1803BK
Operating Voltage	15 volts_of_direct_current
Operation Mode	Automatically,Off
Part Number	1803BK
Switch Type	Potentiometer
Unit Count	10 Count
Voltage	15 volts_of_direct_current
Wattage	30 watts

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