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Use Code: FREESHIP for free economy shipping on all orders $49+

Isolation Transformer

117VAC to 117VAC
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Adjustable DC Power Supply

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Variable Transformers

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AC-AC Power Supplies

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DC Power Extension Cables

Perfect solutions for LED lighting, security cameras, & web cams
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DC plug size conversion

An easy DIY way to change the DC 2.1x5.5mm plug to another size
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Variable Transformer 10 Amp (1000 Watts); 0~130VAC Output w/ISOLATION; Part # SC-10T - AC-DC PowerShack

Variable Transformer 10 Amp (1000 Watts); 0~130VAC Output w/ISOLATION

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$199.00
$199.00 - $199.00
$199.00
$180.00
$180.00 - $180.00
$180.00
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Power DC Extension Cables

  • HDCQ3 3ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    HDCQ3 3ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    $2.50 - $2.50
    $2.50
    $2.50 - $2.50
    $2.50

    HDCQ3 3ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG

    PHC Enterprise, Inc.
    5+ in stock

    Part #: HDCQ3 2.1mm x 5.5mm Extension Cable for Power Adapter Female Jack: 2.1mm x 5.5mm Male Plug: 2.1mm x 5.5mm Length: 3 ft Gauge: 20 Cable:...

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    $2.50 - $2.50
    $2.50
    $2.50 - $2.50
    $2.50
  • HDCQ3W 3ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE - AC-DC PowerShack
    HDCQ3W 3ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE - AC-DC PowerShack
    $2.50 - $2.50
    $2.50
    $2.50 - $2.50
    $2.50

    HDCQ3W 3ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE

    PHC Enterprise, Inc.
    5+ in stock

    Part #: HDCQ3W 2.1mm x 5.5mm Extension Cable for Power Adapter Female Jack: 2.1mm x 5.5mm Male Plug: 2.1mm x 5.5mm Length: 3 ft Gauge: 20 WHIT...

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    $2.50 - $2.50
    $2.50
    $2.50 - $2.50
    $2.50
  • HDCQ6 6ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    HDCQ6 6ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    $3.50 - $3.50
    $3.50
    $3.50 - $3.50
    $3.50

    HDCQ6 6ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG

    PHC Enterprise, Inc.
    5+ in stock

    Part #: HDCQ6 2.1mm x 5.5mm Extension Cable for Power Adapter Female Jack: 2.1mm x 5.5mm Male Plug: 2.1mm x 5.5mm Length: 6 ft Gauge: 20 Cable...

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    $3.50 - $3.50
    $3.50
    $3.50 - $3.50
    $3.50
  • HDCQ6W 6ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE - AC-DC PowerShack
    HDCQ6W 6ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE - AC-DC PowerShack
    $3.50 - $3.50
    $3.50
    $3.50 - $3.50
    $3.50

    HDCQ6W 6ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE

    PHC Enterprise, Inc.
    5+ in stock

    Part #: HDCQ6W 2.1mm x 5.5mm Extension Cable for Power Adapter Female Jack: 2.1mm x 5.5mm Male Plug: 2.1mm x 5.5mm Length: 6 ft Gauge: 20 WHITE...

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    $3.50 - $3.50
    $3.50
    $3.50 - $3.50
    $3.50
  • HDCQ12 12ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    HDCQ12 12ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    $5.30 - $5.30
    $5.30
    $5.30 - $5.30
    $5.30

    12ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG

    PHC Enterprise, Inc.
    5+ in stock

    Part #: HDCQ12 2.1mm x 5.5mm Extension Cable for Power Adapter Female Jack: 2.1mm x 5.5mm Male Plug: 2.1mm x 5.5mm Length: 12 ft Gauge: 20 Cabl...

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    $5.30 - $5.30
    $5.30
    $5.30 - $5.30
    $5.30
  • HDCQ12W 12ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE - AC-DC PowerShack
    HDCQ12W 12ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE - AC-DC PowerShack
    $5.30 - $5.30
    $5.30
    $5.30 - $5.30
    $5.30

    HDCQ12W 12ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE

    PHC Enterprise, Inc.
    5+ in stock

    Part #: HDCQ12W 2.1mm x 5.5mm Extension Cable for Power Adapter Female Jack: 2.1mm x 5.5mm Male Plug: 2.1mm x 5.5mm Length: 12 ft Gauge: 20 WHI...

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    $5.30 - $5.30
    $5.30
    $5.30 - $5.30
    $5.30
  • HDCQ20W 20ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE - AC-DC PowerShack
    HDCQ20W 20ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE - AC-DC PowerShack
    $9.50 - $9.50
    $9.50
    $9.50 - $9.50
    $9.50

    HDCQ20W 20ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG, WHITE

    PHC Enterprise, Inc.
    5+ in stock

    Part #: HDCQ20W 2.1mm x 5.5mm Extension Cable for Power Adapter Female Jack: 2.1mm x 5.5mm Male Plug: 2.1mm x 5.5mm Length: 20 ft Gauge: 20 WHI...

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    $9.50 - $9.50
    $9.50
    $9.50 - $9.50
    $9.50
  • HDCQ25 25ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    HDCQ25 25ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    $9.50 - $9.50
    $9.50
    $9.50 - $9.50
    $9.50

    HDCQ25 25ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG

    PHC Enterprise, Inc.
    5+ in stock

    Part #: HDCQ25 2.1mm x 5.5mm Extension Cable for Power Adapter Female Jack: 2.1mm x 5.5mm Male Plug: 2.1mm x 5.5mm Length: 25 ft Gauge: 20 Cabl...

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    $9.50 - $9.50
    $9.50
    $9.50 - $9.50
    $9.50
  • HDCQ50 50ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    HDCQ50 50ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG - AC-DC PowerShack
    $13.00 - $13.00
    $13.00
    $13.00 - $13.00
    $13.00

    HDCQ50 50ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG

    PHC Enterprise, Inc.
    5+ in stock

    Part #: HDCQ50 2.1mm x 5.5mm Extension Cable for Power Adapter Female Jack: 2.1mm x 5.5mm Male Plug: 2.1mm x 5.5mm Length: 50ft Gauge: 20 Cabl...

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    $13.00 - $13.00
    $13.00
    $13.00 - $13.00
    $13.00
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Collection list

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Take a look at our universal power supplies

Selectable Multi-voltage Power Supply

w/6-interchangble DC plugs

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Universal Selectable-Voltage AC-to-DC Adapter: 3VDC-12VDC @ 2.5 Amp

Featured collection

  • Featured Closeout Items
  • 3~15VDC @ 2A DC Regulated Switching Tattoo Power Supply; Part # 5486 - AC-DC PowerShack
    Save 40% Save %
    $20.00
    $20.00 - $20.00
    $20.00
    $12.00
    $12.00 - $12.00
    $12.00

    3~15V DC @ 2A DC Regulated Switching Tattoo Power Supply

    Superior Tattoo
    5+ in stock

    Part #: 5486 Closeout Special Input Voltage: 90~120VAC Output Voltage: 3~15VDC Output Current: 2A Requires 1/4" foot switch (H4-M) to operate. Sol...

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    $20.00
    $20.00 - $20.00
    $20.00
    $12.00
    $12.00 - $12.00
    $12.00
    Save 40% Save %
  • 3~15VDC @ 2A DC Regulated Switching Tattoo Power Supply; Part # PS-10T - AC-DC PowerShack
    3~15VDC @ 2A DC Regulated Switching Tattoo Power Supply; Part # PS-10T - AC-DC PowerShack
    Save 50% Save %
    $34.99
    $34.99 - $34.99
    $34.99
    $17.50
    $17.50 - $17.50
    $17.50

    3~15VDC @ 2A DC Regulated Switching Tattoo Power Supply

    PHC Enterprise, Inc.
    5+ in stock

    Part #: PS-10T  Closeout Special Input Voltage: 90~120VAC Output Voltage: 3~15VDC Output Current: 2A Precision 10-Pot Turn dial Requires 1/4" foot...

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    $34.99
    $34.99 - $34.99
    $34.99
    $17.50
    $17.50 - $17.50
    $17.50
    Save 50% Save %
  • Adjustable 3~15VDC @ 4A DC Regulated Switching Power Supply (BLACK); Part # APS-415 - AC-DC PowerShack
    Adjustable 3~15VDC @ 4A DC Regulated Switching Power Supply (BLACK); Part # APS-415 - AC-DC PowerShack
    Save 25% Save %
    $39.99
    $39.99 - $39.99
    $39.99
    $30.00
    $30.00 - $30.00
    $30.00

    Adjustable DC Regulated Switching Power Supply (BLACK) 3~15VDC @ 4A

    PHC Enterprise, Inc.
    5+ in stock

    Part #: APS-415 Input Voltage: 117VAC Output Voltage: Adjustable 3~15VDC Output Current: 4A W/Banana Jacks Color: Black

    $39.99
    $39.99 - $39.99
    $39.99
    $30.00
    $30.00 - $30.00
    $30.00
    Save 25% Save %
  • Adjustable 3~15VDC @ 4A DC Regulated Switching Power Supply (YELLOW); Part # APS-415Y - AC-DC PowerShack
    Adjustable 3~15VDC @ 4A DC Regulated Switching Power Supply (YELLOW); Part # APS-415Y - AC-DC PowerShack
    Save 25% Save %
    $39.99
    $39.99 - $39.99
    $39.99
    $30.00
    $30.00 - $30.00
    $30.00

    Adjustable DC Regulated Switching Power Supply (YELLOW) 3~15VDC @ 4A

    PHC Enterprise, Inc.
    5+ in stock

    Part #: APS-415Y Input Voltage: 117VAC Output Voltage: Adjustable 3~15VDC Output Current: 4A W/Banana Jacks Color: YELLOW

    $39.99
    $39.99 - $39.99
    $39.99
    $30.00
    $30.00 - $30.00
    $30.00
    Save 25% Save %

Blog posts

  • When you may need an isolation transformer
    May 1, 2023

    When you may need an isolation transformer

    An isolation transformer can help reduce RF power noise in an electrical system. An isolation transformer is designed to provide electrical isolation between the input and output circuits, typically by using a transformer with a 1:1 ratio. This isolation helps...

    Read now
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Let customers speak for us

from 26 reviews
Cables

Quick ship and good parts. Thanks

Phillip Rayer
6ft 2.5mm x 5.5mm DC Plug Extension Cable, 20 AWG
6ft 2.5mm x 5.5mm DC Plug Extension Cable, 20 AWG
Great product!

Hon was very helpful in helping me figure out which power supply I needed, and was very prompt and delivery. I’m very satisfied!

TIM HOLDER
AC-DC Linear Power Supply 12V DC @ 800mA; 2.1 x 5.5mm (+) center polarity
AC-DC Linear Power Supply 12V DC @ 800mA; 2.1 x 5.5mm (+) center polarity

Adjustable DC Regulated Switching Power Supply (YELLOW) 3~15VDC @ 4A

Robert Stahl
Adjustable DC Regulated Switching Power Supply (YELLOW) 3~15VDC @ 4A
Adjustable DC Regulated Switching Power Supply (YELLOW) 3~15VDC @ 4A
Works great!

It was carefully packed, arrived intact and works perfectly..

PL
Variable Transformer 10 Amp (1000 Watts); 0~130VAC Output w/ISOLATION
Variable Transformer 10 Amp (1000 Watts); 0~130VAC Output w/ISOLATION

HDCQ25 25ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG

Charles Coffell
HDCQ25 25ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG
HDCQ25 25ft 2.1mm x 5.5mm DC Plug Extension Cable, 20 AWG
Works for non-standard audio effects

Most guitar pedals and effects boxes are standard 9V center negative DC, but my Alesis Phlngr actually needs 9V AC. I had to find the right plug size which ended up being 2.5 mm inner diameter instead of 2.1mm like this adapter. This site also sells the converter from 2.1x5.5 mm to 2.5x5.5 mm that allows me to interface with this unit. Works as intended.

Nikolai Koppernick
AC-AC Power Supply 9V AC @ 1110mA; 2.1 x 5.5mm
AC-AC Power Supply 9V AC @ 1110mA; 2.1 x 5.5mm
CPAP power attempt

I was hoping it would work, but given that there are at least two specifications for the 7.4 mm connector, it would not fit my CPAP. It is a great idea though.

Henry Simpson
DC Barrel Plug Adapter to 7.4 x 5.0 mm from 2.1 x 5.5mm
DC Barrel Plug Adapter to 7.4 x 5.0 mm from 2.1 x 5.5mm
Replacement for BOSS SE-50 Supply

I bought this adapter for my Boss SE-50 since I did not want to spend $40+ on a giant brick known as the BRB-120. I had one of the original Roland power supplies back in the day and hated how much space it took up just for a half-1U rackmount. However the plug on the AC/AC adapter I bought here is 2.1mm x 5.5mm so I also got a converter on this website to adapt it to the 3.0mm x 6.3mm plug in the back of the SE-50. I have confirmed this to be operational, and a less expensive shoehorn for the BRB-120.

Nikolai Koppernick
AC-AC Power Supply 12V AC @ 1000mA; 2.1 x 5.5mm
AC-AC Power Supply 12V AC @ 1000mA; 2.1 x 5.5mm
Great Power Isolation Unit

I received my 300VA Isolation Transformer and it was in perfect condition. I have shipped and received many equipment but none were as protected as this transformer unit. Packaging is A++. The transformer is package in a nice solid case with a power cord and one output socket. (I wished it had two). I am now using it to isolate my test equipment when in use to an isolated radio product. I am very happy with this isolation transformer unit.

David Tulloss
300VA Isolation Transformer, 117VAC to 117VAC
300VA Isolation Transformer, 117VAC to 117VAC

500VA Isolation Transformer, 117VAC to 117VAC

David Soul
500VA Isolation Transformer, 117VAC to 117VAC
500VA Isolation Transformer, 117VAC to 117VAC
review

product received in good condition, and works real well. thanks

ARLO LEMKE
AC-DC Universal Power Adapter Multi Voltage Output: 3.0V DC-12V DC @ 700 mA; 7-plugs
AC-DC Universal Power Adapter Multi Voltage Output: 3.0V DC-12V DC @ 700 mA; 7-plugs
High quality product.

Arrived packaged in three boxes in perfect condition. Works as advertised a full floating transformer with no reference to earth ground.

James Maggy
1000VA Isolation Transformer, 117VAC to 117VAC
1000VA Isolation Transformer, 117VAC to 117VAC
Does the Job

Bought this for a Bellari VP130 phono preamp since the stock power supply has a bad reputation for noise. Sounds clean when running, had the negative center, and the 15VDC 1A needed.

Chris M
AC-DC Switching Regulated Power Supply 15V DC @ 1000mA; 2.1 x 5.5mm NEGATIVE center polarity
AC-DC Switching Regulated Power Supply 15V DC @ 1000mA; 2.1 x 5.5mm NEGATIVE center polarity

Worked well

Allan Lang
Replacement contact brush for SC-3M Variable transformer; Part # BRUSH-SC3M
Replacement contact brush for SC-3M Variable transformer; Part # BRUSH-SC3M
Hard-to-Find Item for 6.5V Digital Camera

After much searching elsewhere, I was happy to find
this item on your website.
My older digital camera requires 6.5V DC input when
using an AC adapter, and most new multi-voltage adapters
no longer include a 6.5V setting. This one does.
The adapter is well made and includes multiple tip sizes,
as well as a special tool for selecting the output voltage.
The output voltage selector switch is very well designed,
and has nice positive stops at each voltage position.
I also have a newer 5V DC input camera, so it's great to
have an adapter that is so easily switchable.
Shipping was very prompt, and the adapter arrived in
perfect shape.

Terry H.
AC-DC Universal Digital Camera Adapter Multi Voltage Output: 3V 4.2V 5V 6V 6.5V 7V 8.4V @ 2500mA
AC-DC Universal Digital Camera Adapter Multi Voltage Output: 3V 4.2V 5V 6V 6.5V 7V 8.4V @ 2500mA