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Hot Glue On Circuitry


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Jasonb61 
Copper - Posts: 81
Copper spacespace
Joined: December 01, 2004
Location: United States
Posted: April 11, 2006 at 7:50 PM / IP Logged  
Hello,
I recently purchased some M3 mirrors and like most products I get off eBay I took it apart to see how the quality looked on the inside...
Well, Luckily I found that the circuitry for the LED's was exposed! These are outside mirrors that WILL come in contact with moisture...
Anyways, I wanted to attempt and save them so I covered the circuitry (a few resistors and 2 diodes) with hot glue! The LEDs still work but im wondering if I made a mistake? The LED's wont operate for long periods of time so it wont generate a lot of heat... they will only come on with the blinker or alarm... Did I make a mistake??
-Jason
electrostatic 
Copper - Posts: 154
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Joined: January 06, 2006
Location: United States
Posted: April 11, 2006 at 8:07 PM / IP Logged  
use red insulating varnish or silicone. hot melt glue is easy enough to remove.
Prove your connections, use a meter!
I promise, I'll behave!
firstrax 
Copper - Posts: 113
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Joined: January 18, 2006
Posted: April 11, 2006 at 8:18 PM / IP Logged  

A lot of pc boards have a conformal coating to protect against moisture. A coated board looks almost identical to an uncoated board so your boards may have been coated. If not, conformal coatings are avaible from many electronics distributors in spray cans.

I doubt the hot glue will harm anything though.

Jasonb61 
Copper - Posts: 81
Copper spacespace
Joined: December 01, 2004
Location: United States
Posted: April 11, 2006 at 8:22 PM / IP Logged  
Ok *PHEW* I just needed some peace of mind... I also like the fact that hot glue will be easy to remove so I can fix a resistor or something if needed... :-D
stevdart 
Platinum - Posts: 5,816
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Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: April 11, 2006 at 8:25 PM / IP Logged  
It's just the heat of some resistors that could unmelt the glue, and that in itself wouldn't hurt anything but put a strain on the leads if the resistor is dangling, but otherwise it's fine to use.  I use it to build crossover circuit boards.  And I don't put in resistors that are going to get that hot!
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

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