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Step 3: Soldering
This step can often be the easiest when soldering audio cables.
You simply need to place your soldering iron onto the contact to melt the solder.
When the solder in the contact melts, slide the wire into the contact.
Remove the iron and hold the wire still while the solder solidifies again.
You will see the solder 'set' as it goes hard.
This should all take around 1-3 seconds.
- A good solder joint will be smooth and shiny.
- If the joint is dull and crinkly, the wire probably moved during soldering.
- If you have taken too long it will have have solder spikes.
If it does not go so well, you may find the insulation has melted, or there is too much stripped wire showing. If this is the case, you should desolder the joint and start again.
Cleaning Your Soldering Iron
You should clean your tip after each use. There are many cleaning solutions and the cheapest (and some say best) is a damp sponge. Just rub the soldering iron tip on it after each solder.
Another option is to use tip cleaner. This comes in a little pot that you push the tip into. This works well if your tip hasn't been cleaned for a while. It does create a lot of smoke, so it is better not to let the tip get so dirty that you need to use tip cleaner.
Some solder stations come with a little pad at the base of the holder. If you have one of these, you should get into the habit of wiping the tip on the pad each time you apply solder with it.
If you need to clean solder off a circuit board, solder wick is what you need. You place the wick on the joint or track you want to clean up, and apply your soldering iron on top. The solder melts and is drawn into the wick. If there is a lot of solder the wick will fill up, so gently pull the wick through the joint and your iron, and the solder will flow into it as it passes.
Tips and Tricks
- Melted solder flows towards heat.
- Most beginning solderers tend to use too much solder and heat the joint for too long.
- Don't move the joint until the solder has cooled.
- Keep your iron tip clean.
- Use the proper type of iron and tip size.
If either of the parts you are soldering is dirty or greasy, the solder won't take (or 'stick') to it. Desolder the joint and clean the parts before trying again.
Another reason the solder won't take is that it may not be the right sort of metal. For example you cannot solder aluminium with lead/tin solder.
If the joint has been moved during soldering, it may look grainy or dull. It may also look like this if the joint was not heated properly while soldering.
If the joint was overheated the solder will have formed a spike and there will be burnt flux residue.
(Tiếp theo là phần 3: Cân bằng trong Âm thanh)