| I need a power supply! How do I choose the correct one for my device? |
If you are not sure which power supply you should buy for your device, please click the link below and fill out our help form, letting us know the device's model name and manufacturer, and we'll advise exactly which power supply you should purchase!
Digidave power supply help form
When choosing a replacement power adaptor, you need to consider the power requirements of the device, and also the size of the tip adaptor needed.
1. Output Voltage and current
Voltage V and current A are printed on your original adaptor, and, most likely, also on the device you need to power. The voltage is usually written right by the power input on the device.
Choose a power supply with voltage V equal to the original voltage and of the same type (AC or DC - usually DC).
Choose a power supply with current A equal to or higher than the current on the original power supply or device.
2. Output tip size
The power adaptor will need the right-sized tip for your device.
There are 3 dimensions, usually measured in millimetres.
For example - a tip size of 9.5/2.1/5.5mm means that the barrel length is 9.5mm, the internal diameter is 2.1mm and the outside diameter is 5.5mm.
3. Output Polarity
AC to DC adaptors will have a negative centre (inner negative) or a positive centre (inner positive).
Make sure the power adaptor has the correct polarity for your device.
If a power supply has a number of interchangeable tips supplied with it, the polarity can easily be changed to negative or positive.
If you're still not sure which power supply you should buy for your device, please click the link below and fill out our help form, letting us know the device's model name and manufacturer, and any other information that you have (such as a power supply part number), and we'll advise exactly which power supply you should purchase!
Digidave query form
Keywords: how to choose correct power adaptor supply device plug voltage current transformer
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| User Comments (Add Comment) |
Roy Biles (rbiles@sky.com) - 19 Aug 2010
Hi I need a power adapter for Creative I-Trigue 2.1 speakers. I think it is 12v DC 2.9a. Please could you help me.
Thanks |
Caroline Digidave - 19 Aug 2010
Hi Drew - You can find the adaptor you need, 12V Seagate FreeAgent 9NK2AL-510 HDD replacement power adaptor, here in our Amazon webshop: http://www.amazon.co.uk/gp/product/B003ZVK786 |
Drew - 18 Aug 2010
Hi, I have to replace the power adapter on my Seagate Freeagent Desktop external harddrive, and I don't know which one to get! Help!! Thank you!! |
Caroline Digidave (sales@digidave.co.uk) - 04 Dec 2009
Hi Aisha - This power adaptor will suit the MK-100: http://www.digidave.co.uk/jshop/product.php?xProd=4589&ref=KB43 |
Aisha (aisha_s55@hotmail.com) - 28 Nov 2009
I have lost my power supply so i don't know anything about the requirements of volts and whether its ac-dc either. Please help. The model is Yamaha portasound mk100.
Thanks,
Sam |
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| Additional Information |
Article ID: 43
Author: Caroline Swords
Created On: 17 Oct 2005
Edited On: 07 Jan 2010
Edited By: Caroline Digidave
Views: 19175 |
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