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Led Costume re-wire problem Anonymous Thu Dec 28 13:47:40 2017 No.1303997 [Reply] [Original]

Hi there,
Need another pair of eyes and advice on this. Years ago I snagged a Dollar Store 10 green LED string/decoration that runs off of 2 AAs, and always planned to do something with it once I figured what. I've been working progressively on a LED costume/rave gear, and have run into a little snag with what I want to do.

The battery-pack is too large to sit in a tight compartment of the costume without throwing off some stuff and I wanted to ask if it's possible to simply rewire it to a A23 battery pack? would I need a resistor for the change of battery?

Ideally I want to have this ready for New Year's Eve, because of an event I'm going to, If not its no big loss.
>Pic included

>>	Anonymous Thu Dec 28 14:36:05 2017 No.1304039 >An A23 battery is an 8-cell device with a nominal voltage of 12 V. >vs 2x1.5V of course you need a resistor http://led.linear1.org/1led.wiz I see 10 LEDs, they are parallel so current x10, so that would be 56 Ohm, 2.2 Watt

>>	Anonymous Thu Dec 28 14:51:33 2017 No.1304042 also if they are low consumption ones it would be 560 ohm, 0.5 watt

Anonymous Thu Dec 28 14:56:29 2017 No.1304045

>>1303997
You can also replace the battery pack with a cr2023 button cell. The type used on computer motherboards and other things. Just note which wire is going to the positive side of your current battery, then connect that wire to the positive side of the cr2023. Same with the negative side. However, you should also rip apart your current battery pack to get the resistor out of that one and solder it directly to either the positive or negative wire before connecting the wires to the button cell.

The button cell won't last as long long, but it will probably last a couple of hours. Just bring a spare on NYE.

>>	Anonymous Thu Dec 28 15:38:19 2017 No.1304066 >>1304045 >>1304042 >>1304039 Greatly appreciate all the feedback, thanks a bunch!

>>	Anonymous Thu Dec 28 15:40:51 2017 No.1304068 >>1304045 Also there is no resistor in the pack, its just the string, wired to the battery pack.

>>	Anonymous Thu Dec 28 15:56:58 2017 No.1304075 >>1304068 Are you sure? I see the clear plastic battery pack. It looks like there is a switch on the top. The resistor may be soldered to the switch.

>>	Anonymous Thu Dec 28 16:00:01 2017 No.1304076 >>1304075 Double-checked it, no resistor at all.

Anonymous Thu Dec 28 16:54:36 2017 No.1304103

>>1303997
the pack itself is much larger than the batteries. what about duck taping two 1.5V batteries together, side to side with a wire or just end to end, so as to get the full battery effect and lifetime without so much of the size and without adding components?

>>	Anonymous Thu Dec 28 17:08:57 2017 No.1304112 >>1304103 Sadly due to the compartment space, it would wind up getting in the way of LED mounting placement I have planned. Plus it wouldn't be close enough to a viable corner to cut a notch for switch access.

>>	Anonymous Thu Dec 28 18:48:13 2017 No.1304165 he's right, there's probably a resistor hidden somewehere. ohm it out.

>>	Anonymous Fri Dec 29 10:56:57 2017 No.1304570 >>1304075 These fairy led lights frequently have no resistor and instead rely on the resistance of the wire itself.

>>	Anonymous Fri Dec 29 16:13:13 2017 No.1304726 File: 34 KB, 540x399, 8FCDA25B-405A-48E2-9D2F-0A47A11E394B.jpg [View same] [iqdb] [saucenao] [google] >>1304039

Anonymous Fri Dec 29 17:47:16 2017 No.1304772
File: 18 KB, 467x348, 1501347328848.gif [View same] [iqdb] [saucenao] [google]

>>1304570
that'd be interesting, such high-resistance wires
more likely they rely on the Vf vs. If curve of particular LEDs, and to a lesser extent on the internal resistance of the battery for e.g. throwies, Pic related.

>>	Anonymous Fri Dec 29 17:55:02 2017 No.1304777 File: 75 KB, 600x220, 1491788434182.jpg [View same] [iqdb] [saucenao] [google] >>1304165 >>1304570 >>1304772 it depends on the material. some greens are lower voltage than others.

>>	Anonymous Sat Dec 30 00:09:57 2017 No.1304988 A23 would be a bad idea. an A23 battery is 12 volts. LEDs will usually burn out if they get more than 3 volts. just use a cr2032 coin cell

>>	Anonymous Sat Dec 30 00:26:26 2017 No.1304992 >>1304772 Your voltage axis is labled wrong. It should be just v. Not Vf

>>	Anonymous Sat Dec 30 02:16:25 2017 No.1305033 I'm going to go ahead and state the obvious, simple, solution. More wire between the first LED and the battery box.

>>	Anonymous Sun Dec 31 09:46:53 2017 No.1305788 Can we get more details about what you are trying to do and how/why things are getting in the way?

>>	Anonymous Sun Dec 31 16:18:23 2017 No.1305972 >>1303997 well, it's NYE, where are the pics

>>	Anonymous Mon Jan 1 11:01:27 2018 No.1306460 >>1303997 >rave gear This is /diy/, please get out

>>	Anonymous Mon Jan 1 14:02:07 2018 No.1306567 >>1305972 Sadly I wasn't able to buy the parts in time because of delivery estimates. >>1306460 You don't like fun do you?

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