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.
Buying anything on Amazon? Please use the Geekzone Amazon aff link.




1375 posts

Uber Geek
+1 received by user: 84


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
2799 posts

Uber Geek
+1 received by user: 458


  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.

2799 posts

Uber Geek
+1 received by user: 458


  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.



1375 posts

Uber Geek
+1 received by user: 84


  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

2799 posts

Uber Geek
+1 received by user: 458


  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:





Trending now »

Hot discussions in our forums right now:

Has Spark (Telecom) locked their iphone 6 ?
Created by anewguy2014, last reply by michaelmurfy on 17-Dec-2014 14:32 (25 replies)
Pages... 2


forgot how to unlock a car door
Created by joker97, last reply by joker97 on 19-Dec-2014 19:10 (49 replies)
Pages... 2 3 4


In defence of cats
Created by Rikkitic, last reply by DarthKermit on 17-Dec-2014 15:40 (68 replies)
Pages... 3 4 5


Slaughter of Innocents
Created by networkn, last reply by networkn on 19-Dec-2014 17:46 (64 replies)
Pages... 3 4 5


How is iParcel these days?
Created by peejayw, last reply by surfisup1000 on 18-Dec-2014 21:45 (19 replies)
Pages... 2


Spray Foam Insulation
Created by AACTech, last reply by timbosan on 19-Dec-2014 16:58 (36 replies)
Pages... 2 3


Police Camera Van Disguise
Created by Reanalyse, last reply by KiwiNZ on 20-Dec-2014 08:39 (34 replies)
Pages... 2 3


Google Chromecast now available in New Zealand
Created by freitasm, last reply by markl on 18-Dec-2014 15:36 (153 replies)
Pages... 9 10 11



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.