Advice 1: How to solder headphone wire

The most unreliable part of headphones is the wire. It can be run down, to grind, to break, etc. What to do if the wire no longer passes the signal? You can go to the store and buy new headphones, but you can try to fix it.
How to solder headphone wire
Instruction
1
Carefully inspect the wiring of the headphones. Find a place where they are damaged. Most often, the tear occurs near the plug, near the headphones themselves, at least somewhere in the middle of the cable or directly to the headphones themselves, if the wire does not fixed at the entrance of the building. Depending on the place of anguish, will have to apply different methods of repair.
2
Take the soldering iron. You will need it in all cases. So, if the headphone wire is damaged or broken somewhere in the middle , do the following. Carefully cut the damaged area of the wire. Clean the contacts enough length to be soldered.
3
For Stripping in any case, do not use a knife or a lighter. Put the wire on the plate and spend a few times on it with a soldering iron. The insulation is removed cleanly and gently. Take rosin or a special composition for the soldering of FS-1.
4
Treat them contacts. Then take the tin. Dial it up a bit on the heated soldering iron and solder contacts so that between them never left tin jumpers. Take the tape. Gently wrap the soldering.
5
Take a knife. If the wire is frayed near the plug, you will have to remove its case, because there is no possibility to expose long enough contact for soldering. In this case, you will have to solder directly to the contacts of the plug. Usually plugs the headphone cast.
6
Remove the protective layer of plastic. Take the soldering iron. Remove with it the remnants of the contacts with the soldering on the plug. Bare contacts on the wire.
7
Solder the wires exactly as they were soldered to it, i.e. red to red, etc. Wrap the plug with electrical tape. If the wires broke away from the headphones themselves, act exactly the same as in the case of the plug. Disassemble the headphone and solder the contacts just like they were soldered before.

Advice 2: How to solder plastic

One method of repair chips and cracks on the plastics – epoxy resins. However, professionals suggest to do otherwise. Best crack on plastic welding with the use of concurrent reinforcement. This is done so.
How to solder plastic
Instruction
1
In order to get to work for starters find a reinforcement material. Suitable bronze mesh is not too thick (0.1-0.2 mm), non-rigid, but such that was capable of keeping its shape after deformation. Choose exactly bronze, because it is an excellent warming up, solder and does not rust, although it can also come in brass or copper mesh.
2
So, first of all you should wash the plastic, then run a sweep of all areas, containing various defects to the state of pure plastic, that is clear from the existing chips and cracks around the perimeter at a distance of approximately 5 mm from the edge. Now take the bronze mesh and cut it into strips the width of which will be about 7-10 mm.
3
Take the soldering iron, plug it in, and while it heats, take the plastic, put on it sliced a strip of mesh so that it overlaps the crack from all sides, and press them to each other by soldering. In the same way probajte all the seams.
4
Please note that you must start from the front side. If the plastic is thin, the reverse side is likely to show through the ground, it lightly smoothen with the help of soldering iron. If you work with thick plastic, it is possible to solder from the back side. At the seams, make holes, and do not leave the lumps, they are then easier to remove (for example, using putty).
5
The advantages of this way of working with plastic is that the parts can make the original look even on both sides. Besides, everything happens quite quickly, that is a lot of time this procedure will not take you.
6
If you decide to use resin or adhesive, pre-test to the "fatness" of the material, this drip water on the plastic. If the drop spreads, it is possible to use without processing, but if the drop retains the form, or have to grind off or to degrease (for example, alcohol, gasoline, solvent).
Not to experiment with adhesives, use a proven glue for all plastics "Plast spezial" from UHU.
Useful advice
When soldering plastics work only in areas with good ventilation as the fumes can harm your health.
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