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 speed control

🛡️2A self-recovery fuse protection

Description

⚙️ Take control of your motors like a pro — speed, safety, and precision in one sleek package!

BUILT IN SAFETY FUSE - Self-recovering 2A fuse ensures your setup stays protected from overloads without downtime.
PLUG PLAY CONVENIENCE - Manual potentiometer control with LED indicator for intuitive speed adjustments and easy monitoring.
PRECISION SPEED CONTROL - Adjust motor speed seamlessly from 0% to 100% PWM duty cycle for ultimate customization.
COMPACT DURABLE DESIGN - Small footprint (1.26" x 1.26" x 0.59") with robust metal and plastic build for long-lasting use.
WIDE VOLTAGE COMPATIBILITY - Operates reliably between 1.8V and 15V DC, perfect for diverse low-voltage projects.

The Onyehn 1803BK is a compact, reliable DC motor speed controller kit featuring 10 units with adjustable PWM control from 0% to 100% duty cycle. It supports input voltages from 1.8V to 15V DC and handles up to 2A continuous current with built-in self-recovery fuse protection. Designed for safe, precise motor speed regulation in low-voltage applications, it includes a manual potentiometer and LED power indicator, making it ideal for professional-grade automation and DIY projects.

Specifications

ASIN	B07NPJ5MQR
Best Sellers Rank	#796,199 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #900 in Electrical Motor Controls
Brand	Onyehn
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 out of 5 stars 193 Reviews
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
Number of Positions	6
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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