Home > Knowledgebase > I need a power supply! How do I choose the correct one for my device? 23 Jul 2017
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)
Caroline Digidave - 21 Jul 2011

Hi Alistair - I've emailed you - please respond to my email and I'll sort the problem out.
alistair roberts (alistairroberts1774@yahoo.co.uk) - 17 Jul 2011

i bought this power adapter as recommended and it has the wrong jack size any help please i need a 2.5mm female fitting
Caroline Digidave - 17 Jun 2011

Hi Alistair - Here's the adaptor you need:
http://www.digidave.co.uk/jshop/product.php?xProd=1001810
"12V DVE DSA-15P-12 UK 120150 replacement power supply adaptor"
alistair roberts (alistairroberts1774@yahoo.co.uk) - 16 Jun 2011

i'm looking for a replacement for a dve power adapter model dsa-15p-12 uk
dc input 100-240v0.5a
output +12v 1.25a
Caroline Digidave - 29 Apr 2011

Hi John - Here's the adaptor you need: http://www.digidave.co.uk/jshop/product.php?xProd=4584
"9V UL310-0913 Roku replacement power supply adaptor"
John (john.opray@live.co.uk) - 26 Apr 2011

Hi, I would like a replacement supply for my Roku M1000, AC 100:240V 50/60Hz 0.3A
DC: 9V 1.3A
Ally mcerlaine (Allyz@mac.com) - 13 Apr 2011

Looking for a power supply for my memory man do you stock these?
Caroline Digidave (sales@digidave.co.uk) - 08 Apr 2011

Hi Andrew - Sorry, we don't stock a suitable adaptor at this time.
Guy Paterson (epskeyboard@hotmail.com) - 04 Apr 2011

Hi - looking for a replacement for a Logitech bluetooth keyboard / mouse
the AC adatper is model 190162-0000
Andrew Neill (aneill07@qub.ac.uk) - 03 Apr 2011

Hi there, can you suggest an equivalent psu to the Jentec JTA0202y, 4 pin mini dim supply? It's needed for a Lacie DVD writer, F.A. Porsche model. Many thanks.
Caroline Digidave (sales@digidave.co.uk) - 16 Sep 2010

Hi - Here's a link to the 9V power adaptor you need for your Roland/Edirol device: http://www.digidave.co.uk/jshop/product.php?xProd=36068&utm_source=froogle&utm_medium=link&utm_campaign=fpspi0910
steve slater (rekuiem@sky.com) - 15 Sep 2010

I have an Edirol FA-101. Can you suggest a replacement PSU and confirm the spec, eg, voltage/polariry/ampage. etc.
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: 86060

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