12V AC-AC power adapter by PHC Enterprise, Inc., 1000mA (1A) output with 2.1mm x 5.5mm barrel connector, shown in image.

PHC Enterprise 12V AC-AC power adapter, 1000mA (1A), with 2.1mm x 5.5mm connector

12V AC-AC power adapter by PHC Enterprise with 2.1mm x 5.5mm plug, 1000mA (1A) output for electronic devices

12V AC-AC Power Adapter 1000mA (1A), 2.1mm x 5.5mm | AC-121A

Name: 12V AC-AC Power Adapter 1000mA (1A), 2.1mm x 5.5mm | AC-121A
Rating: 4.39 (18 reviews)

by PHC Enterprise, Inc.

$13.00 - $13.00

$13.00

$13.00 - $13.00

$13.00

12V AC-AC Linear Wall Transformer — 1000mA (1A) | Model AC-121A

The AC-121A is a linear wall-mount AC-to-AC power adapter delivering a clean 12V AC output at 1000mA (1 Amp). Unlike DC adapters, this unit outputs true alternating current (~) — making it the correct replacement for devices that specifically require 12VAC input. If your device's label shows 12V~ or 12VAC, this is the adapter you need.

⚠️ Important: This is an AC-AC adapter. It outputs alternating current (~), not DC (⏳). Using an AC-AC adapter on a DC-only device can cause permanent damage. Verify your device requires AC output before purchasing.

Technical Specifications

Model: AC-121A
Input: 120V AC, 60Hz (standard US wall outlet)
Output: 12V AC @ 1000mA (1 Amp)
Connector: 2.1mm (ID) x 5.5mm (OD) straight barrel plug
Type: Linear wall-mount transformer (non-regulated)
Note: As a non-regulated supply, output voltage may measure slightly higher than 12V under no-load conditions

Common Use Cases & Compatible Devices

Holiday Decor: Fiber optic Christmas trees, rotating village displays, and animated ornaments requiring 12VAC
Audio Equipment: Bose Active Lighting systems, pre-amplifiers, turntable motors, and certain Alesis gear
Landscape & Fountain Lighting: Low-voltage 12VAC landscape lighting transformers and small pond pumps
Security Systems: 12V AC alarm control panels, door strikes, and access control hardware
HVAC & Smart Home: Certain thermostats and zone controllers requiring 12VAC

Common Replacement Compatibility

Frequently used as a direct replacement for OEM 12VAC adapters on: Bose Active Lighting, Alesis audio gear, Fiber Optic Christmas Trees, and Honeywell security systems. Always verify your device's rated current draw does not exceed 1000mA (1A).

Frequently Asked Questions

Q: How do I know if my device needs AC or DC?
A: Check the power input label on your device. AC is indicated by the ~ symbol or the letters VAC. DC is indicated by ⏳ or VDC. If it says DC, this adapter will not work.

Q: Why does my voltmeter read higher than 12V?
A: Linear transformers are non-regulated. The output voltage will read higher under no-load (nothing plugged in) and will settle to the rated 12V when a load is applied.

Q: Is this compatible with international voltages?
A: No — this unit is designed for 120V AC 60Hz (US/Canada only). It is not compatible with 220-240V outlets without a step-down transformer.

Q: What if I need more current than 1A?
A: Check our full AC-AC adapter line for higher-current options.

5 stars: 15 (83%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 1 (6%)
1 star: 2 (11%)

AC to AC adapter for Halloween decorations

Exactly what we needed! Great communication and fast shipping

Excellent product!

Thanks to this AC/AC adapter, this Zoom RFX-2000 unit was brought back to life.

Thank you ACDC PowerShack, excellent service.

12V AC @ 1000mA Power Supply 2.1 x 5.5mm

I purchased this for my fiber optic Hummingbird lamp because it has a color wheel synchrous motor in which requires the above power adapter. This company is the only company I found that carries these adapters. I bought one, and now have bought 2 more, one for my sister who has the same lamp and another for me, because I recently purchased another fiber optic lamp. Hans was very helpful and I truly appreciate the help he provided. Thank you Hans!

Thank you for your kind words Marcia. I hope the 2 additional power supply with the modified plug works well with your wonderful lamps.

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.

Value/Quality/Fast Shipping! Great experience!

I was searching for a power supply for a guitar accessory that had unusual specs compared to my other pedal units. Found it quickly, ordered it and received it very quickly. Great quality, great price, reasonable shipping rates. Couldn’t be happier. Will definitely be buying from you again and will recommend you to others in the guitar community needing similar products. Thank you!

Life back to a cherished item

Happy to find item , Delighted to handle transaction with a real person.

What I needed!

Fair price, quick turn, and had the inventory in an obscure AC power supply for an older mechanized village ornament. AC-DC PowerShack had exactly what I needed. Thanks!

Awesome experience

Web site was very helpful to make sure I had the right replacement plug and it arrived in a few days.
Had to cut the plug end off to replace a hard wired plug from an old Halloween decoration but it worked and saved a 25 year old holiday decoration.

12V AC-AC Power Adapter, 1000mA (1A) Wall Transformer, 2.1mm x 5.5mm Plug | Model AC-121A

AC-AC Power Supply 12V AC @ 1000mA; 2.1 x 5.5mm

Works exactly as expected, solid and reliable

This power supply does exactly what it’s supposed to do. It provides a stable 12V AC output and has been working reliably with my equipment without any noise, heat issues, or voltage instability.

The connector fits securely, and the unit feels solid and well-built. No hum, no interference, and no surprises—which is exactly what you want from a power supply.

It’s refreshing to find a straightforward, dependable AC-AC adapter without unnecessary complexity. I would buy it again if I needed another.

Adapters

I don't need these my adapters want the problem need to get a return label asap

fibro optic christmas tree

The ac-ac adaptor has brought a special vintage christmas tree back to life. Thank you

Power supply

Transformer to power Christmas Santa fiber optic light.power cord shorted .Replacement works great.

Wonderful! Happy the power supply is working as expected. Thank your business and happy holidays!

It’ll work.

The 12 volt ac supply outputs slightly less than 14 volts so under load this works for my application.

Hi there, thank you for your feedback! We're glad to hear that the AC-AC Power Supply is working well for your application. Just to clarify, the output voltage may vary slightly under load, but it is designed to provide a stable 12 volts AC at 1000mA. If you have any further questions or concerns, please don't hesitate to reach out. We're always happy to help. Thank you for choosing our product!

Works like it should.

I'm pleased with my order. Item was shipped promptly & works perfectly. Would order from again!

Hi there! Thank you for taking the time to leave a review. We're so glad to hear that our AC-AC Power Supply is working perfectly for you. We always strive to provide prompt shipping and quality products, so it's great to know we met your expectations. We appreciate your support and would be happy to assist you with any future orders. Have a wonderful day!

Sentimental Value Restored!

This power supply replaces one for a 32 inch fiber optic Christmas tree that belonged to my mother. When I unpacked the box this year, the old power supply fell out and broke. The new one is a perfect replacement, and I was pleased by the quick delivery. Thanks very much!

Appreciate the review Louie. So happy the correct power supply and plug size was a perfect match for your lights.

Power Supply arrived but dose not work.

Arrived on time, I wish it worked because it cost me more to have it shipped then the cost for the Power Supply. Not a happy customer

Thank you for your reply. Was the item defective or did the specs not match what was required for your device? All of our power supplies are UL/cUL approved and are made to meet all of its safety and quality standards. The defect rate is actually very small, especially brand new out of the box.

We will try and reach out to you to find the right match to your satisfaction.

5 stars: 15 (83%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 1 (6%)
1 star: 2 (11%)

AC to AC adapter for Halloween decorations

Exactly what we needed! Great communication and fast shipping

Excellent product!

Thanks to this AC/AC adapter, this Zoom RFX-2000 unit was brought back to life.

Thank you ACDC PowerShack, excellent service.

12V AC @ 1000mA Power Supply 2.1 x 5.5mm

Thank you for your kind words Marcia. I hope the 2 additional power supply with the modified plug works well with your wonderful lamps.

Replacement for BOSS SE-50 Supply

Value/Quality/Fast Shipping! Great experience!

Life back to a cherished item

Happy to find item , Delighted to handle transaction with a real person.

What I needed!

Fair price, quick turn, and had the inventory in an obscure AC power supply for an older mechanized village ornament. AC-DC PowerShack had exactly what I needed. Thanks!

Awesome experience

12V AC-AC Power Adapter, 1000mA (1A) Wall Transformer, 2.1mm x 5.5mm Plug | Model AC-121A

AC-AC Power Supply 12V AC @ 1000mA; 2.1 x 5.5mm

Works exactly as expected, solid and reliable

This power supply does exactly what it’s supposed to do. It provides a stable 12V AC output and has been working reliably with my equipment without any noise, heat issues, or voltage instability.

The connector fits securely, and the unit feels solid and well-built. No hum, no interference, and no surprises—which is exactly what you want from a power supply.

It’s refreshing to find a straightforward, dependable AC-AC adapter without unnecessary complexity. I would buy it again if I needed another.

Adapters

I don't need these my adapters want the problem need to get a return label asap

fibro optic christmas tree

The ac-ac adaptor has brought a special vintage christmas tree back to life. Thank you

Power supply

Transformer to power Christmas Santa fiber optic light.power cord shorted .Replacement works great.

Wonderful! Happy the power supply is working as expected. Thank your business and happy holidays!

It’ll work.

The 12 volt ac supply outputs slightly less than 14 volts so under load this works for my application.

Works like it should.

I'm pleased with my order. Item was shipped promptly & works perfectly. Would order from again!

Sentimental Value Restored!

Appreciate the review Louie. So happy the correct power supply and plug size was a perfect match for your lights.

Power Supply arrived but dose not work.

Arrived on time, I wish it worked because it cost me more to have it shipped then the cost for the Power Supply. Not a happy customer

We will try and reach out to you to find the right match to your satisfaction.

5 stars: 15 (83%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 1 (6%)
1 star: 2 (11%)

AC to AC adapter for Halloween decorations

Exactly what we needed! Great communication and fast shipping

Excellent product!

Thanks to this AC/AC adapter, this Zoom RFX-2000 unit was brought back to life.

Thank you ACDC PowerShack, excellent service.

12V AC @ 1000mA Power Supply 2.1 x 5.5mm

Thank you for your kind words Marcia. I hope the 2 additional power supply with the modified plug works well with your wonderful lamps.

Replacement for BOSS SE-50 Supply

Value/Quality/Fast Shipping! Great experience!

Life back to a cherished item

Happy to find item , Delighted to handle transaction with a real person.

What I needed!

Fair price, quick turn, and had the inventory in an obscure AC power supply for an older mechanized village ornament. AC-DC PowerShack had exactly what I needed. Thanks!

Awesome experience

12V AC-AC Power Adapter, 1000mA (1A) Wall Transformer, 2.1mm x 5.5mm Plug | Model AC-121A

AC-AC Power Supply 12V AC @ 1000mA; 2.1 x 5.5mm

Works exactly as expected, solid and reliable

This power supply does exactly what it’s supposed to do. It provides a stable 12V AC output and has been working reliably with my equipment without any noise, heat issues, or voltage instability.

The connector fits securely, and the unit feels solid and well-built. No hum, no interference, and no surprises—which is exactly what you want from a power supply.

It’s refreshing to find a straightforward, dependable AC-AC adapter without unnecessary complexity. I would buy it again if I needed another.