RC-Monster Forums - View Single Post - Lehner 1930 De-soldered Itself??

BrianG · 06.05.2007, 10:09 AM

I'm thinking the heat of the motor didn't desolder it, it was the heat of the bridge itself that did it. Essentially, they acted like a fuse. Fuses use a small piece of metal that can only accept so much current before it heats up and eventually blows. I'm thinking this same thing happened to your LMT. If the solder bridges were too thin, or the solder had a higher resistance. Higher solder resistance means more voltage will be dropped across the bridge for a given current, which produces power (heat) to the point where it melts. You might want to try a better quality solder - maybe something with silver in it instead.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	06.05.2007, 10:09 AM I'm thinking the heat of the motor didn't desolder it, it was the heat of the bridge itself that did it. Essentially, they acted like a fuse. Fuses use a small piece of metal that can only accept so much current before it heats up and eventually blows. I'm thinking this same thing happened to your LMT. If the solder bridges were too thin, or the solder had a higher resistance. Higher solder resistance means more voltage will be dropped across the bridge for a given current, which produces power (heat) to the point where it melts. You might want to try a better quality solder - maybe something with silver in it instead.