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LED lighting without batteries?

 
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Sixpack
Semi Newbie


Joined: 17 Feb 2008
Posts: 5

PostPosted: Sun Feb 24, 2008 9:12 pm    Post subject: LED lighting without batteries? Reply with quote

Hi all, I'm new here as well as to this whole subject. I've made several little projects with LEDs run from 9v batteries, but I was looking at a box of junk and I have a bunch of DC adapters from now missing devices. Why do all projects run off of batteries instead of being plugged in? Most of these wall adapters are 9V, 200 ma. I find all kinds of online calculators that determine resistors based on voltage, but I'm a bit confused as to the limitations of amps.

Sorry if its a dumb question, but I'm just a bored guy with a soldering iron!
Thanks.
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Project_Nightmare
HG Master


Joined: 12 Oct 2007
Posts: 119
Location: Gig Harbor, WA

PostPosted: Mon Feb 25, 2008 5:37 pm    Post subject: Reply with quote

Things run mainly on batteries because they are portable energy sources.

I highly recommend that you use a volt meter on the wall adapters since most of the time the voltage rating on the wall wart is a lie and it is much higher then they state. The Amp rating is usually how much power that can be drained from it without the risk of damaging the unit or how much power it can supply before the voltage output drops from the load demands.
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Sixpack
Semi Newbie


Joined: 17 Feb 2008
Posts: 5

PostPosted: Mon Feb 25, 2008 5:57 pm    Post subject: Reply with quote

Project_Nightmare wrote:
Things run mainly on batteries because they are portable energy sources.

I highly recommend that you use a volt meter on the wall adapters since most of the time the voltage rating on the wall wart is a lie and it is much higher then they state. The Amp rating is usually how much power that can be drained from it without the risk of damaging the unit or how much power it can supply before the voltage output drops from the load demands.


Gotcha. Thanks! I'll be sure and check the actual voltage.
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