Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




2252 posts

Uber Geek
+1 received by user: 361


Topic # 93415 21-Nov-2011 10:28 Send private message

Hi,
I wonder if someone can give me some advice please.

I have a device that needs a 9V DC power source - it can use batteries (6 x 1.5 AA batteries) - but batteries get to be a pain.

It says on the device that it needs 9v then it says 850mA.
I think the one that the manufacturer will proved as an expensive accessory is apparently 500mA.

I tried a Dick Smith adaptor (regulated) that can output 9V - it said it was 500mah and the device worked fine - I dont want to use that adaptor though.

I have found an adaptor that is 9v and says its "OUTPUT:9V 1000mA 9VA"
I would guess the last A probably refers to Adjusted? (ie regulated)

Now assuming I get the polarity correct (Thats my issue of course), am I right thinking that the 1000mA just means it *can* output up to 1000mA if required. So assuming the device uses less it wont hurt it.




Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler

Create new topic
4161 posts

Uber Geek
+1 received by user: 1091


  Reply # 547748 21-Nov-2011 10:36 Send private message

The 9VA is volt-amps.

It is quite possible this is outputing AC not DC, so you would need to confirm that first.

4161 posts

Uber Geek
+1 received by user: 1091


  Reply # 547750 21-Nov-2011 10:38 Send private message

Oops, clikced the button too quickly...

Having said that, you are correct about the current - the current listed on a power supply is the maximum that it can supply, but the device will only draw what it needs.

The voltage and polarity must match though.

 

 





2252 posts

Uber Geek
+1 received by user: 361


  Reply # 547765 21-Nov-2011 10:59 Send private message

Thanks RunningMan,
It has that symbol - the line with the 3 dashes underneath - That seems to be the symbol for DC.
It also says its an AC-DC Adaptor - So I think I am ok on the DC.
But thanks for the current advice.




Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler

4161 posts

Uber Geek
+1 received by user: 1091


  Reply # 547796 21-Nov-2011 11:54 Send private message

Excellent - you should be fine then. Generally they will also say if they are regulated or not - whether this matters depends on the specific equipment being connected...

Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Telecommunications monitoring report: Are you being served?
Posted 24-May-2017 11:54


NetValue partners with CRM Provider SugarCRM
Posted 23-May-2017 20:04


Terabyte looms as Vocus users download 430GB a month
Posted 19-May-2017 14:51


2degrees tips into profit after seven lean years
Posted 19-May-2017 09:47


2degrees growth story continues
Posted 17-May-2017 15:25


Symantec Blocks 22 Million Attempted WannaCry Ransomware Attacks Globally
Posted 17-May-2017 12:41


HPE Unveils Computer Built for the Era of Big Data
Posted 17-May-2017 12:39


Samsung Galaxy S8 Plus review: Beautiful, feature-packed
Posted 16-May-2017 20:14


After ten years of mail pain Spark is done with Yahoo
Posted 15-May-2017 13:12


Warnings from security firms: do not click that link or risk your computer being infected
Posted 15-May-2017 10:11


Pushpay named NZ Hi-Tech Company of the Year 2017
Posted 15-May-2017 09:59


Passive Optical Lan means fibre to the desktop
Posted 12-May-2017 17:09


Finalists Named for 2017 CIO Awards
Posted 11-May-2017 20:00


Exhibition to showcase digital artwork from across the globe
Posted 10-May-2017 18:54


Accelerate 2017 to focus on navigating disruption with a design thinking mindset
Posted 10-May-2017 18:49



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.