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Main image of 3vdc -12 volt Universal AC/DC Power Adapter USB Port | 8 Reversible Polarity Positive or Negative Tips Center Tip 3v 4.5v 5v 6v 7.5v 9v 12v 1a 12w Transformer 5.5mm 2.5mm 2.1mm 3.5mm 4.0mm 5.0mm 1.7mm

Alt view image 2 of 6 - 3vdc -12 volt Universal AC/DC Power Adapter USB Port | 8 Reversible Polarity Positive or Negative Tips Center Tip 3v 4.5v 5v 6v 7.5v 9v 12v 1a 12w Transformer 5.5mm 2.5mm 2.1mm 3.5mm 4.0mm 5.0mm 1.7mm

Alt view image 3 of 6 - 3vdc -12 volt Universal AC/DC Power Adapter USB Port | 8 Reversible Polarity Positive or Negative Tips Center Tip 3v 4.5v 5v 6v 7.5v 9v 12v 1a 12w Transformer 5.5mm 2.5mm 2.1mm 3.5mm 4.0mm 5.0mm 1.7mm

Alt view image 4 of 6 - 3vdc -12 volt Universal AC/DC Power Adapter USB Port | 8 Reversible Polarity Positive or Negative Tips Center Tip 3v 4.5v 5v 6v 7.5v 9v 12v 1a 12w Transformer 5.5mm 2.5mm 2.1mm 3.5mm 4.0mm 5.0mm 1.7mm

Alt view image 5 of 6 - 3vdc -12 volt Universal AC/DC Power Adapter USB Port | 8 Reversible Polarity Positive or Negative Tips Center Tip 3v 4.5v 5v 6v 7.5v 9v 12v 1a 12w Transformer 5.5mm 2.5mm 2.1mm 3.5mm 4.0mm 5.0mm 1.7mm

Alt view image 6 of 6 - 3vdc -12 volt Universal AC/DC Power Adapter USB Port | 8 Reversible Polarity Positive or Negative Tips Center Tip 3v 4.5v 5v 6v 7.5v 9v 12v 1a 12w Transformer 5.5mm 2.5mm 2.1mm 3.5mm 4.0mm 5.0mm 1.7mm

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3vdc -12 volt Universal AC/DC Power Adapter USB Port | 8 Reversible Polarity Positive or Negative Tips Center Tip 3v 4.5v 5v 6v 7.5v 9v 12v 1a 12w Transformer 5.5mm 2.5mm 2.1mm 3.5mm 4.0mm 5.0mm 1.7mm

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Multi-Voltage 12 Watt (12w/1-amp) replacement switching power adapter supply compatible with 1000s of small electronic devices using requiring 3 volt, 4.5 volt, 5 volt, 6 volt, 9 volt, or 12 volt up to 1.0a or 12 watts including many Electronics, Tablets, Routers, Smart Phones, Speakers, Monitors, TVs, LCDs, Cameras & Other USB Port Charging up to 12watt 1000ma with US 120 volt Plug
Includes 8 Interchangeable DC Tips/Plugs of the most popular sizes: 5.5mm x 2.5mm / 5.5mm x 2.1mm / 5.0mm x 2.1mm / 3.5mm x 1.35mm / 4.0mm x 1.7mm/ 2.5mm / 3.5mm / 2.5mm x 0.7mm. Please make sure your device is one of these size jacks on it for proper fit and the standard center positive polarity. New Upgraded model comes with a USB port built in
NEW model now has REVERSIBLE DC Tip Polarization - Both Center/Inside/Middle Tip Positive (+) Outer/Outside Tip Negative (-) and Inside/Center Negative (-) Outer/Outside Positive (+) Can be Set by Removing Tip and Placing it in Opposite Position. This allows for maximum device compatibility as it can be set to operate in both center tip pos and center tip neg polarities. Please be sure to verify your device polarity, tip size and voltage before purchasing.
Need More Wattage? Check Out Our 30W Universal Power Adapter. Message Us for More Details.

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ProTechTrader

ProTechTrader is a small family business dedicated to our mission on electronics: to teach and provide.

We are dedicated to teaching the basics of electronics through resources and service! Our journey as a small business has continued for over a decade. We owe much of our success to Mr. Charles Platt and his wonderful book series “Make: Electronics” and its counterparts. We are proud to work alongside Mr. Platt to provide component kits to complete the experiments in his books, just the way he wanted!
Make: Electronics 3rd Ed Kits
Are your Make: Electronics kits official?

Yes! ProTechTrader is the official recommended supplier for Make: Electronics kits by Charles Platt. We work directly with the author to ensure our component packs contain the correct parts for each experiment in his books.

What makes our products unique?

We are the only official kit supplier for Make: Electronics, Make: Easy Electronics, Make: Radio, and Make: More Electronics Kits!

Why do we love what we do?

Rounding up every necessary component can be time-consuming and overwhelming. We've done all the shopping for you so you can hit the ground running!

ProTechTrader

ProTechTrader is a small family business dedicated to our mission on electronics: to teach and provide.

We are dedicated to teaching the basics of electronics through resources and service! Our journey as a small business has continued for over a decade. We owe much of our success to Mr. Charles Platt and his wonderful book series “Make: Electronics” and its counterparts. We are proud to work alongside Mr. Platt to provide component kits to complete the experiments in his books, just the way he wanted!
Make: Electronics 3rd Ed Kits
Are your Make: Electronics kits official?

Yes! ProTechTrader is the official recommended supplier for Make: Electronics kits by Charles Platt. We work directly with the author to ensure our component packs contain the correct parts for each experiment in his books.

What makes our products unique?

We are the only official kit supplier for Make: Electronics, Make: Easy Electronics, Make: Radio, and Make: More Electronics Kits!

Why do we love what we do?

Rounding up every necessary component can be time-consuming and overwhelming. We've done all the shopping for you so you can hit the ground running!

ProTechTrader ™ Universal AC/DC Power Adapter with Multiple Voltage Output (3v-12v) Allows you to easily replace your old wall wort transformer, and allows you the flexibility to use it with multiple devices featuring 8 interchangeable DC tips, with compatibility for 1000s of small electronic devices it can save you a lot of headaches finding the correct plug. New upgraded model includes a USB port built in to the base for convenient charging you Apple iPhone, iPad, Samsung Galaxy Smart Phones, and other Android smartphones & tablets utilizing the industry standard 5 volt USB charging ports along with reversible tip polarity. Both Center/Inside Positive (+) Outer/Outside Negative (-) and Center/Inside Negative (-) Outer/Outside Positive (+) Can be Set by Removing Tip and Placing it in Opposite Position.

It is important you first verify your device's power requirements match the possible voltages available and plugs included with this item before purchasing. All electronics will not be compatible. If you are uncertain make sure you ask first before purchasing.

. UL 60950-1 Certified
ROHS Compliant

Input: 110v - 220v AC
Output: 3v - 12v DC
Max Current: 1 amp

Polarity: Center Positive or Center Negative - BE SURE TO INSTALL TIP CORRECTLY MATCHING POLARITY ON YOUR DEVICE.

Included Tip Sizes:
2.5MM (Micro Headphone/Phono Style)
3.5MM (Mini Headphone/Phono Style)
2.5mm*0.7mm
3.5mm*1.35mm
4.0mm*1.7mm
5.0mm*2.1mm
5.5mm*2.1mm
5.5mm*2.5mm

Please Note: It is important to verify the tip size and power requirements for your device. If you are not sure please contact us with your product brand & model help.

Not recommended for use with radios as some static may be produced by electrical fluctuations.

Product information

Brand	ProTechTrader
Color	Black
Item Weight	0.08 Kilograms
Input Voltage	220 Volts
Item dimensions L x W x H	2 x 1 x 2 inches
Product Dimensions	2 x 1 x 2 inches
Item model number	VPOW312-USB
Is Discontinued By Manufacturer	No
Date First Available	September 1, 2016
Manufacturer	ProTechTrader

Additional Features

Voltage is easy to change by the switch on the side of the adapter. Be sure you're using the correct VOLTAGE & POLARITY for your device before plugging it in. If you are not sure please use the "Customer Questions & Answers" section below before purchasing and provide your product brand, model, and part number if available and we will try to help verify your device's power requirements.
UL Listed & ROHS Compliant | Input: 110v - 220v AC / Output: 3v - 12v DC - Maximum Current from DC tip is up to 2.5a or 30 watts (USB Port Limit is 1.0amps) - If your device requires less power, such as 200ma, 300ma, 400ma, 500ma, 600ma, 750ma or any other up to 2500ma through the DC barrel connectors it will work with this adapter with a matching tip and proper voltage/polarization

Best Seller Ranking	#7 in Computer Power Adapter Cords

Additional Information
First Listed on Newegg	December 04, 2025

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3vdc -12 volt Universal AC/DC Power Adapter USB Port | 8 Reversible Polarity Positive or Negative Tips Center Tip 3v 4.5v 5v 6v 7.5v 9v 12v 1a 12w Transformer 5.5mm 2.5mm 2.1mm 3.5mm 4.0mm 5.0mm 1.7mm

ProTechTrader

Make: Electronics 3rd Ed Kits

Are your Make: Electronics kits official?

What makes our products unique?

Why do we love what we do?

ProTechTrader

Make: Electronics 3rd Ed Kits

Are your Make: Electronics kits official?

What makes our products unique?

Why do we love what we do?

Product information

Additional Features

Learn more about the Detailed Specifications

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info