Shouldn't 12v be enough for seven 3mm LEDs?

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TITAN14
Posts: 3
Joined: Tue Feb 06, 2007 3:00 pm

Re:

Post by TITAN14 » Wed Sep 06, 2017 10:37 pm

Ant wrote:
Sat Sep 10, 2016 12:42 pm
Hmm, this might suggest that the battery just not have the capacity to light them all. You could try higher resistors, this may get them all lit, but they may not be bright enough for your needs....
What Ant said. The battery has been called out multiple times. The voltage is only whats required to drive the current through the elements in the network. Your LEDs nominally use ~20mA but thats variable within tolerances PLUS the resistors themselves are using current to change the voltage (watts). This is the inherent inefficiency of parallel arrays and the reason you have been getting a hard time about your parallel setup. EVERYTHING is pointing to insufficient power supply. By that we mean: not enough Amps.

Im also into saltwater tanks and over in that community everyone is trying to get as many LEDs in series on a driver as they can for their lighting. Power consumption is a big deal because it adds up to big electric bills. In addition they want consistent current going through as many LEDs as possible so all of the emitters are the same brightness. In most applications series LEDs is by far the preferred method of powering LEDs. Over here making models you need to make compromises because sometimes you can't get as many cells into a space as you would like or don't want to risk a LED dying inside your model where you can't get to it and fix it.

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TurkeyVolumeGuessingMan
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Re: Re:

Post by TurkeyVolumeGuessingMan » Thu Sep 07, 2017 1:15 am

TITAN14 wrote:
Wed Sep 06, 2017 10:37 pm
What Ant said. The battery has been called out multiple times. The voltage is only whats required to drive the current through the elements in the network.
The battery is more than enough for this project. The problem was that I tried lighting them in series and not parallel. It works now just fine. I had to redo the model after the plastic warped but the replacement is set to be glued together and painted real soon.
Greg
Plastic modeling and other nerd stuff in Japan on my YouTube channel
My WIP modeling page on Tumblr.
Ah, you know it's funny, these people, they go to sleep. They think everything's fine, everything's good. They wake up the next day and they're on fire.

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