SoulBay 30W Reverse Polarity Universal AC Adapter Multi Voltage DC Power Supply, with 9pcs Adaptor Tips, Compatible with 3V to 12V Household Electronics, 2Amp Output
Original price was: £17.99.£13.99Current price is: £13.99.
Price: £17.99 - £13.99
(as of Jun 11, 2025 15:20:21 UTC – Details)
Product Description
SoulBay 30W Universal AC Adapter Reverse Polarity DC Power Supply 3V to 12V
Reverse Polarity: You can select which polarity you want!
This SoulBay 30W AC Adapter allows for use across multiple devices, multiple DC voltages, and multiple connector types.
Comes with protection of over voltages, over current, short circuits and over temperature, more safe!
Secure connection: 2-pin dc jack with clear adapter dimension mark, easily connected to the adapter cord end and change polarity.
Compatible with a variety of household electronics within 3V to 12V output range, such as router, speaker, monitor, camera, smartphone, led strip, piano, keyboard, effect pedal board, DIY machine and more.
Instructions:
1. Connect the correct adapter plug
– Select a suitable plug and then insert into the DC cable end, make sure it’s firmly attached to the power port of your device.
2. Set the right DC output voltage
– There are 7 Volts options. (use the little key to choose the right voltage. If the required voltage is not in the options, please choose the closest one. eg, if your device needs 5.5V, you can choose 5V or 6V)
3. Connect the adapter to the electrical socket, ready to power your device!
FAQ:
How Can I Change and Confirm the Polarity?
Answer: Make sure the adapter cord end you are going to connect has an arrow symbol.
– Connects the dc tip side with dimension remark to the cord end, is positive polarity.
– Conencts the dc tip side without the dimension remark to the cord is negative polarity. You can also distinguish the polarity via the symbol on the dc tip.
What’s the working Voltage and Amps range?
Answer: We name this power adapter 30W. 30Watt depends on the max output on 12V 2A and USB Port, 12V*2A + 5V*1.2A = 30W.
2Amp is the max current output on each Voltage setting, backwards compatible 1.8A 1.5A 1A 0.5A.
What’s the function of the KEY?
Answer: To adjust the voltage knob and choose the suitable Volt setting.
Versatile
Multi-Voltage
Multi-Tips
Quality
Specifications
Input Voltage (AC): 100–240V 50/60hz Output Voltage: DC 3V 4.5V 5V 6V 7.5V 9V 12V selectable Output Current: 2Amps (max) at each voltage Polarity: Dual polarity, reversible polarity Storage Temperature: -40 to 85° C Operating Temperature: 0 to 40° C Built-In Circuit Protection： Overvoltage, undervoltage, over temperature, Short circuit protection Adapter Tips Specifications: 5.5*2.5mm, 5.5*2.1mm, 5.5*1.5mm, 5.0*2.1mm, 4.0*1.7mm, 3.5*1.35mm, 3.5mm mono, 2.5mm mono, Female USB plug.
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Customer Reviews
4.4 out of 5 stars 413
3.8 out of 5 stars 14
4.4 out of 5 stars 58
Price
£12.99£12.99
— no data
£15.99£15.99
DC Output
3V-12V 3V-24V 6V-24V
Output Current:
2A max. 3A max. 2A max.
Wattage
30 Watt 72 Watt 41 Watt
DC Tips
9pcs 14pcs 11pcs
Polarity Reversal?
X
✓
✓
Package Dimensions : 12 x 8.3 x 5.7 cm; 170 g
Date First Available : 16 Dec. 2020
Manufacturer : SoulBay
ASIN : B08QRWW89M
Country of origin : China
Guaranteed software updates until : unknown
Reverse Polarity Power Adaptor: Most adapters only have single polarity, positive (+) or negative (-) polarity. This SoulBay AC Adapter owns Dual Polarity, reversible and changeable.
Versatile Power Supply: Straightforward adjustment for All-in-one multi adapters and multi amp devices, solid and well built. Voltage range, connector jacks and polarity are Selectable.
Wide Applications: The power supply is for router, speaker, monitor, camera, smartphone, led strip, piano, keyboard, effect pedal board, and a variety of household electronics require 3 volt, 4.5 volt, 5 volt, 6 volt, 7.5 volt, 9 volt, 12 volt DC output with 2000ma load.
Save On Adapters: Own this AC DC adapter, you could use it for multiple devices and replace a lot old power adapters, savings on buying a new electronic device or extra original expensive power supply.
Package: You will get a 1 x 3-12V universal adapter, 9 x changeable adapter tips, 1 x key. Each adapter tip has the clear dimension mark, no mess and convenient for you!
Customers say
Customers find the power adapter works well and appreciate its versatility, with one mentioning it’s designed for use with various electronic devices. The product receives positive feedback for its quality, value, and power supply capabilities, with one customer noting it provides 2 amps of output current. While customers can change voltage and polarity easily, some find the polarity set-up design ambiguous.
8 reviews for SoulBay 30W Reverse Polarity Universal AC Adapter Multi Voltage DC Power Supply, with 9pcs Adaptor Tips, Compatible with 3V to 12V Household Electronics, 2Amp Output
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Original price was: £17.99.£13.99Current price is: £13.99.
Londoner –
Far less unsafe than some suggest when properly connected and set-up
This is designed and intended for use as a power supply and not a recharger. It is designed for use with a variety of electronic devices whose power needs fit within the 3-12V at 2.5A range (or lower current levels) and where it can replace or be a permanent alternative to disposable or rechargeable batteries.The “SoulBay 30W Reverse Polarity Universal AC Adapter Multi Voltage DC Power Supply, with 9pcs Adaptor Tips, Compatible with 3V to 12V Household Electronics, 2Amp Output” supplies voltages mostly stepped at 1.5v intervals in well-marked and positively engaged steps when set by the enclosed key – a medium flat blade screwdriver will work equally well. It is unusual in that it has a means to reverse the polarity of the output voltage such that the numerous devices with a positive centre core connector are readily accommodated but, by reversing the tip, allows the relative few with a negative core to also be served.Some reviews appear to suggest that it is potentially dangerous to use, not to the user but to devices, because there is no certainty about tip orientation. That is INCORRECT and MISLEADING! The output lead is clearly labelled on its ‘normal’ side and provides a positive core when a tip is properly connected. Each tip is also very obviously labelled on both larger surfaces, one showing the core as positive, the other negative. It could not be much clearer unless in flashing red neon!In addition to subsequently purchasing one for personal use, one identical was first purchased by a family member as a power source for a single device, the alternative being an OEM PSU at more than twice the price as it requires a negative core supply and they are almost impossible to find as third-party alternatives! It was set up to meet its specific voltage and polarity needs and works perfectly.The tips are a very tight fit and need to be firmly connected until fully engaged – they will not easily accidentally disconnect – it needs a strong grip! The voltage dial, once set, will stay as-is and cannot easily disengage without the aid of the key or a screwdriver.Safety considerations are better implemented than with a similar product from another brand where its tips use an easily disconnected co-axial method and voltage adjustment is by a large knob whose position could be easily altered by a careless touch, passing pet or young child and pass unnoticed, risking the device should the voltage supply be beyond its limits – it does have a small LED display for output voltage but that cannot prevent an accidental voltage increase, only show that it occurred.
Don Tony –
Works just as it should.
Does the job. Just used for a couple of weeks. No issues. Full range of voltages available to be able to run small battery powered equipment from mains power.
Brainwave –
Provides Power for various devices
Works well, the only thing that would improve it would be to be able to change the power settings without the special key provided. Like a slider selection switch. That would have made it 5 stars.
Teating1212 –
dose what it says on the box
dose what it says on the box, good quality
Victor –
Very good multi addaptor
Packaged well. Nothing missing. Worked perfectly for a 12v ctr neg device that I needed to use. I would say that the polarity is a little ambiguous compared to others I’ve used.
Anthony Bennett –
Covers many power needs..
It works a treat.. Covers all my needs in this one stop power source.. Highly recommended..Fast delivery..
Mr. N. Morgan –
Versatile mains adapter with good output range and reversible polarity
This is a compact, quite powerful and versatile mains adapter at a sensible price that will provide 2 amps of output current throughout its range from 3 volts (where 2 amps = 6 watts) to 12 volts (where 2 amps = 24 watts).I bought this unit mainly for the reversible output polarity feature which consists of a decent length lead that terminates in a two-pin socket.What I liked:Nine of the more common sizes of DC barrel connectors are supplied, each of which ‘plugs into’ this in-line socket either way round.Output polarity (i.e. centre pin positive or negative) depends on which way round you insert the barrel connector onto the lead and polarity is marked on both the lead and plug-in connector: simply line up the arrowhead on the lead with the required polarity on the barrel connector and push the connector firmly home.The output voltage selector switch is quite stiff to turn, very positive and cannot be accidentally changed.The barrel connectors sit firmly in the socket and take some effort to remove, so they should not fall out inadvertently.Voltage regulation is very good: less than 0.05 volts drop from no load to half load – that’s pretty stable!A separate USB A female socket is provided on the base of the unit with a 5 volts 2amp output rating.The unit stays very cool in operation and barely warmed up in over an hour’s use on a warm day.The 5 Volt output from the built-in USB socket was almost right on the button at 5.06V: that’s very good!What I wasn’t so impressed with:The output voltages on the barrel connector were a tad high for my liking: nothing to worry about, but they were up to 10% high at the lower voltages. This is highly unlikely to cause any damage to connected equipment as a freshly-manufactured unused 1.5 volt alkaline battery can initially provide in excess of 1.6V. The output voltages on my unit are recorded below.Rated Actual3V 3.33V4.5V 4.71V5V 5.21V6V 6.18V7.5V 7.67V9V 9.06V12V 12.18VThe unit is double-insulated and does not have an earth connection (the earth pin is plastic, not metal), which results in a tiny amount of mains leakage current, but this is very low and I could only JUST detect it by rubbing the barrel connector across the inside of my wrist (it felt like a barely detectable nibbling sensation).Hint:If you find the range of barrel connectors included with the adapter is somewhat limited or does not contain the one you need, I extended the range by:1) purchasing this set of barrel connectors: Amazon part no. ASIN: B07F7776T62) connecting the 5.5×2.1mm barrel plug that came with the Soulbay mains adapter onto the two pin lead, selecting the required polarity.3) pushing the appropriate Aceyoon barrel connector for the equipment I was using onto the end of the 5.5 x2.1mm Soulbay barrel connector.A little bit of a christmas tree admitted, but it worked!Overall, versatile and not bad for the price, but the unit lost one star with me for the slightly high output voltages at the lower end of the range. This could just be that my unit wasn’t terribly well calibrated: you may fare better.
Amazon Customer –
This PSU does the job.
My old switch mode psu, decided to call it a day, so I decided to go for a psu where the end connector of the PSU cable allows a polarity reversal to be made. I have two retro radios where the inner DC pins are negative polarity, so the two PSU l got do give you this polarity reversal option , and also allows you to set dc voltage output via switch on the PSU. A word of warning. Please see the diagram on the seller’s Amazon site before connecting the PSU to any equipment. Most equipment with low DC voltage input do not tolerate a polarity reversal. Check your product manual for DC power rating. I have given 5 stars as the PSU are working.