How to correctly pick an AC/DC power adapter.
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- Опубликовано: 31 мар 2016
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When you need to replace a power adapter it can be really tricky trying to figure out your volts and your amps and your plug sizes...Often, most people don't know enough to choose correctly and end up damaging their product or possibly destroying it.
Watch the video to get all the details but the basic things you need to know are
Volts
Amperage
Current type & Polarity
and Plug size 
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Great video and fantastic illustration and explanations thank you! Question: Is it usually specified on the back of a power adapter whether it is unregulated or regulated? Is there some symbol that tells the difference between these two or would it just be spelled out?
great video, need more ultra informative, full of facts, and straight science videos like this
Thank you for the excellent explanation.
Great video. Super useful!
I have the same amp and adapter that i got today in the mail and the adapter makes a high pitched whining sound, the sound also (very faintly) comes out of my speakers and gets louder as the volume knob is turned up. Is this a problem with the amp or the adapter? Also is it possible to have you guys send me a new adapter instead of returning the whole thing? I just returned the oneu amp i had before because it stopped working properly after a month and i really dont want to go through the whole process again.
and so if the the C is facing the + facing left or right it is the same polarity.??
so what's the difference in the black and yellow pin??
Thank You. I can't explain how much I appreciate this info.
Thank you! I had to order a replacement power cord for my hdmi box behind the tv from the manufacturer. He sent me one that totally has too large a tip! I was looking for info about tips, what they are called, how to measure ,etc... Your video gave me all this and more! I always like to learn something new, I did today! I just need to know if I can attach a tip converter to my other tip. Or, how I need to do this. I do not think the manufacturer has a power plug for me unless he will raid another units. Linda
great video! Nice explanation!
how does one measure that pin i dont see the information showing that on the lables
So if I need a plug for a 6 v 300mA 0.3 A item will a 6v plug allow it to work?
What size is the adapter
I have a very old casio org sa-10. Which i lost its adapter. It says DC 7.5v --- 1.6w. I am not sure which adapter to go . can you help about it. Thank you
is it true that the lepai 2020 works best with a 12v 5a power supply? is there a big difference in sound?
+ziggy8757 No, since the Lepai 2020 calls for a 12V 2A power supply, that is the best adapter to use. If your in a pinch you COULD use a 12V 5A power supply but you would see no difference in performance.
6 v 1 A plug work?
How do you figure out what to use if the device you're trying to plug into doesn't tell you any sort of that information about 12 volts and 2 amps. Even the manufacturer's website or doing some research online I was not able to find anything. Basically I need the AC adapter to plug underneath my coffee table that's a Chinese brand and it's to power 2 plug outlets on a hub. The usbs next to is already have power from the initial power plug that comes Hardware onto the table itself that runs the LEDs, and the USB Outlets. The only thing that doesn't power is those plug Outlets which require that AC adapter. Would a 12 volt 2 Amp work for this or do I need something else?
Get one of those universal adapters that comes with multiple voltage settings. Plug it in and start with 5v and work your way up until the USB ports work. Do not go over that voltage setting. Tape or glue the selector in place to avoid changing it accidentally.
Could you help me I require the uk version of the following US plug.
AC-DC ADAPTOR MODEL: 0300200DF INPUT: 120V AC 60Hz OUTPUT: 3.0V DC 200mA is that possible?
very educational. thank u
I have the correct sizes, except it's length, the length is too long... No shop reports the length.. Any suggestions? Its for my Asus vivobook, I need a 4,5 x 3,0 and its length is only 10mm
I have a Dewalt jumpstarter.On the back of the jumpstarter it say the input volts is 14.5.One of my ac adapter is 12v.Is it ok to use 12v to charge the Dewalt jumpstarter.Can I use the 16v input ac adapter It's called Dx aeps14 ?
No, it would have to be 14.5V
Thats great video sir, but I have a quations so :
1. Can I use a type AC connector for DC ?
For example I found a AC connector product the label max. current is 16 A.
2. If I use for DC is safe? How to calculate AC type connector and DC for to implementation?
Best regard, Thanks
No you cannot use an AC adaptor for DC. The current type must match as well.
Can someone please help.
I bought an unregulated supply to replace an old bulky charger which is a 2 pin shaver style plug that is on a UK adapter. The strange thing is when I measure the volts on the old one it actually reads 19V with a multimeter, but it says 12V output at 500mA on it. Whereas the new one reads 12V with multimeter.
Here is what it says this on the back of each:
OLD MODEL:
Model: T-41-12-500D-3Pri
PRI: 230V ~ 50hz 60mA
SEC: 12V DC 500mA
Centre positive
(this is quite bulky and heavy)
NEW ONE:
Input: 100v ~240v AC 50/60hz
Output: 12v DC 500mA
Centre positive
(very light and small)
I plugged them both into the same device, which has a large internal battery and when you first plug in, the charge should stay at 99%, which means it's running off the mains plug and not the internal battery, which is correct. New plug shows it first at 75%, then 1 second later 65% and dropping so it seems to suck power out of the battery.
Any help understanding this much appreciated.
There are a few factors you may be missing in this. Feel free to call our toll free tech support and we can help you get the right thing.
Email: Tech@Parts-Express.com
Phone: 1-800-338-0531
That is a possibility. Also, you can email and/or do a live chat with our techs.
Reason why we don't answer on this channel is we here are not tech support. Social Media team. :)
it amazes me how many people need this video, What also amazes me is how many people dont know that that LP2020 needs a beefy 5A for full power
Let's talk about Diesel engines and I could say the same thing to you, to me it's information I've gained over years, that goes for anything, did you wake up one day and know everything, cause I have lots to learn, but not you I guess.
My Kitchen faucet is from Allen+Roth and is powered by an 6 volts battery port, I'm looking an Ac adapter that can replace the battery port. The model # for the Allen+Roth Kitchen faucet is 67798W-120802 and Item # 2517130. I need your help please finding the right AC adapter.