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14 Jun 2009 - 19:2015829
An alternative to hot glue
Hi guys, I need something to secure a Fimo square button to an LED, but it can't be hot glue because the heat from the LED will melt it. I thought of using stickytape but it'd probably look a bit shoddy, so I was wondering if anybody on here knew of any glue that's not heat sensitive, or another way I could attach them?


14 Jun 2009 - 20:2915834
Epoxy glue might be an option, the type that comes in two tubes and you mix it.

17 Jun 2009 - 21:5915903
I don't mean to be contradictory but I believe LED's run cold. That's one of the differences between them and conventional light bulbs. That's why they are so much more energy efficient - less power is wasted as heat.
If an LED is getting hot something is very wrong, eg it is being overloaded/ has the wrong voltage connected.
..So I think normally an LED won't have any problems being fixed by hot glue. But if you still want to use an alternative I'd say Araldite epoxy glue.

19 Jun 2009 - 21:1515942
If an LED is getting hot something is very wrong, eg it is being overloaded/ has the wrong voltage connected.

Oh dear XDDDD Guess I need to look at my circuit again!

20 Jun 2009 - 18:1615959
Just be careful you don't short-circuit it with the glue ^___^ You could use any extra strong bonding glue- even Wilko have a nice, cheap, non-brittle glue that has the same consistency as hot glue but is a non-thermal induced bond.

I second Ranma1/2 though on all this ^^

xx Tetra xx
21 Jun 2009 - 22:2315981
Yes ^^ you may need to check your claculations. Umm, you have done.. calculations for your circuit??

LED's are very often rated at uncommon battery voltages. e.g. standard batteries jump in 1.5v increments, but an LED can be typically say 2.1v. This means that a single AAA battery is not enough to power it, but doubling up to two batteries gives 3V and this is way over what the LED wants so it can overheat. Normally you have to calculate the value of a small resistor which needs to be connected in series with the LED and brings the supply voltage down to what the LED requires.

Edit: Running an LED above its optimal voltage also reduces its life expectancy.

Last edited by Ranma1-2 (21 Jun 2009 - 22:25)
22 Jun 2009 - 09:0115988
*sigh* It's okay. I was using an LED calculator to figure out what resistors I needed and things, but I've gone and fried my circuit anyway because I connected the 9V battery in back to front, got the earth and power wires mixed up. I should know better to try these things when I don't fully understand what I'm doing

22 Jun 2009 - 13:3615995
Ack, well, better luck on your next try- I'm sure you'll be able to do it! (I'm also going to be using LED's for my Samus costume so all of this is very helpful to me too- thank you both!!)

xx Tetra xx
23 Jun 2009 - 19:3816042
Well here's some handy links for you then:

http://led.linear1.org/1led.wiz - Resistor calculator - plug in your LED values and the battery voltage and it'll tell you what resistor value you need, and the colour codes!

http://samengstrom.com/nxl/3660/4_band_resistor_color_code_page.en.html - Resistor colour code calculator so you can figure out what value resistor you've got ('cause once you've got them on your board/lying over the floor it's easy to forget which one's which!) I'd also recommend a good strong torch to shine on it because blue and violet look very similar.

http://www.kpsec.freeuk.com/solder.htm - Guide to using a soldering iron.

And this ebay seller:
is really great because he's got a bargain pack of resistors for a quid and you can pick 4 different values. He's also got a complete LED kit as well.

Hope they're useful!

23 Jun 2009 - 21:3916055
Yep they are very usefull links indeed, thanks.
And yep those LED's are pesky little componants, since they are basically diodes they must be connected the right way around.

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