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.



869 posts

Ultimate Geek


Topic # 93415 21-Nov-2011 10:28

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 it himself - A. H. Weiler

Create new topic
1332 posts

Uber Geek


  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.

1332 posts

Uber Geek


  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.



869 posts

Ultimate Geek


  Reply # 547765 21-Nov-2011 10:59

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 it himself - A. H. Weiler

1332 posts

Uber Geek


  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 new jobs are posted to our jobs board:



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




News »

Trending now »
Hot discussions in our forums right now:

Fecked up religious people strike again :-(
Created by Mark, last reply by BurningBeard on 25-May-2013 00:03 (84 replies)
Pages... 4 5 6


Cannabis is illegal yet we have really strong 'legal highs' ?
Created by qwerty7, last reply by freitasm on 23-May-2013 23:20 (74 replies)
Pages... 3 4 5


Xbox One
Created by DjShadow, last reply by Kingy on 24-May-2013 13:48 (68 replies)
Pages... 3 4 5


A new project coming to Geekzone
Created by freitasm, last reply by l43a2 on 24-May-2013 23:02 (342 replies)
Pages... 21 22 23


Troublesome transition to VDSL
Created by oseiler, last reply by michaelmurfy on 24-May-2013 13:57 (18 replies)
Pages... 2


HTC One (2013) owners' discussion
Created by Dingbatt, last reply by wlfkfgkwlaktka on 24-May-2013 15:49 (1564 replies)
Pages... 103 104 105


Monolithic Cement Sheet cladding mid 80s house - "leaky home" or not?
Created by joker97, last reply by mattwnz on 24-May-2013 23:46 (15 replies)

Warning - Users with Tenda ADSL modem
Created by Psi, last reply by Psi on 24-May-2013 22:01 (44 replies)
Pages... 2 3



Geekzone Jobs »
Most recent NZ jobs in technology:

Organisational Change Analyst
Posted 24-May-2013 19:28

Dedicated Java Developer/ Technical lead
Posted 24-May-2013 18:28

Account Manager - IT/Telco
Posted 24-May-2013 18:28

Commercial Java Developer
Posted 24-May-2013 18:28

Senior DB2 Database Administrator
Posted 24-May-2013 18:28

Technical BA
Posted 24-May-2013 18:28

OSS Systems Engineer
Posted 24-May-2013 18:28


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.