DC socket to how to weld how to eliminate sparks, these problems are generally novice questions, for novice questions, we also unify the question, I hope you can recognize it.
Recognize these points.
1, the choice of DC socket
Take "30V/0.5A" as an example to show that the current of the socket is 0.5A, and the insulation voltage level is 30V.
The most important thing here is "0.5A", which is the maximum safety current of conductor design. More than 0.5A will heat, oxidize, and fail.
30V is the index of insulation material, and there are differences between them.
2, how to weld the DC socket
To scrape the oxide of the position to be welded, a few solder paste should be used less. It is best to use the 100W soldering iron to weld quickly, and then blow air with the mouth so that the colloid is melted and cooled immediately.
3, DC plug interface positive and negative level
The outlet will be marked (and some voltage is indicated).
4, DC socket to remove sparks
If it is very good, you can add a three pole switch circuit behind the socket of the board, open the power supply through a small button switch, and insert the power into the power supply without the current, of course, there is no spark.
Now, the general use of PNP triode is the simplest, but the use of a large current of the triode or MOS tube, and then is the choice of relay, through the button switch relay to switch the power, but the relay will be
Choose good, exchange of words will use SCR.