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There are 3 common mistakes students make when soldering.

Using the soldering iron like a paintbrush or dripping solder.
This method fails for 2 reasons. It uses contaminated/ not fresh solder. The wires/leads and pads do not get hot enough for the solder to effectively wet them. This means your solder joint may not produce a good electrical connection. We work too hard producing good projects to have them go bad from a bad solder joint.

Putting the solder on the pad before melting it.
This method may not heat the wires/leads and pads enough for the solder to wet the joint.

Heating a part too much. Students may trying for too long to fix a bad joint which ends up heating the component too hot and destroying it internally. Before this becomes a problem try to come up with a plan to fix the problem you have. There are some characteristic signs you can look at to tell you how to fix your problem.
See for some of the ways soldering can go wrong and how to fix it.

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