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What is the J&C Studios O Gauge Archive?
(Guest)   JCS Archive   great northern   hello and led question
 
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hello and led question
great northern
Joined: Oct 10, 2011
Topics: 4   Replies: 3
posted on Oct 30, 2013 10:52 AM:
My Archive Category  



been away far to long!!

I recently purchased 2 battery operated strings of mini led lights one set uses 2 AA batteries the other 3 AAA's can I power both from a AC adapter of 3 volts and both will operate or is it a trial and see how it works type of process.

I found a set at walmart that is a 18 light string with warm white lights it also has a slide switch for either steady on or phasing or flashing and lights up a small castle very nicely. maybe these will help some here as well give them a look see at store display.

thanks in advance for any help on this.
 
stan
Joined: May 18, 2008
Topics: 17   Replies: 16
posted on Nov 5, 2013 12:27 PM:
My Archive Category  

The 3 AAA string probably has some type of voltage reducing component(s) to lower 3 x 1.5 = 4.5V down to the nominal 3V operating voltage of a white LED. So if powered by your 3V adapter, I'd guess it would be dim or perhaps not light at all. See if your 3V adapter says "regulated" on it somewhere. Some 3V adapters are "unregulated" and put out close to 4.5V when lightly loaded and only drops down to 3V at some rated "full" load. So with the combo of items you've mentioned, you might find one or the other works but trying to power both will change the brightness of either individually.

If there is a problem with voltage mismatch I suppose you could mess with components (adding voltage dropping components or removing the voltage dropping components from the 4.5V string) but it's probably easier to buy another matching string.
 
great northern
Joined: Oct 10, 2011
Topics: 4   Replies: 3
posted on Nov 5, 2013 03:35 PM:
My Archive Category  



stan... thank youI was able to get it all working at the 3 volts. the ac adapter I bought is regulated and meter shows 2.8 volts at 3 volt setting. I tried at 4.5 volts and ironically it burned up the leds that were in the cabin so used the other string of lights in there place all is well now.
well. at least last time I had them turned on.
 



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