Can diodes be connected in series with a 48V DC soldering iron?
If diodes cannot be connected in series, a small resistor should be connected in series to divide the voltage. Diodes are used in rectifiers and do not have much voltage dividing effect. Resistors are electronic components specially used for voltage dividing. First, use a multimeter to measure the resistance value of the soldering iron. Then connect a resistor of equal value in series according to this resistance value. Then the voltage distributed to the soldering iron will be reduced to 1/2 of the original value. If the temperature of the soldering iron is too low, it will not be enough. , you can remove this resistor and reconnect in series a resistor with a resistance value of 1/2 of this resistor, so that the voltage distributed to the soldering iron is 2/3 of the original. Through repeated experiments, you can find your optimal series resistance value.
The voltage of the forward diode in a 48-volt DC appliance will be reduced by about 0.7 volts, and the reverse series connection will turn off the power supply. Note that the voltage of the diode in series should be >65 volts, and the forward current should be >2 times the operating current.
Why does tin always stick to the soldering tip when welding with a soldering iron?
If the soldering iron head is not filled with tin, the soldering iron head will soon oxidize due to high temperature. Commonly known as Burnt to Death! After oxidation, the soldering iron tip turns black, and it is quite difficult to melt and solder it first! You will find that the temperature of old iron is so high that even small debris falling on it can cause sparks! But the solder cannot be melted no matter how hot it is! Therefore, the soldering iron tip must retain a layer of tin film to protect the soldering iron tip from oxidation. When welding, the heat can be transferred out in time to ensure the welding quality.
And the soldering iron tip you mentioned always has excess solder, which is also a normal phenomenon. When welding, the melted solder will always flow from places with lower temperatures to places with higher temperatures. Therefore, we can take advantage of this feature and use a soldering iron to suck away part of the solder on the original pins when repairing the circuit board and disassembling parts. Of course, it will be better to use a solder tape and a solder suction device to remove the solder.
After the soldering iron tip absorbs the excess solder, we can use the shaking method, gently vibrate the soldering iron, and use inertia to shake off the excess solder from the soldering iron tip. Generally, we directly dip the soldering iron tip in rosin, and then shake our wrist quickly. , throw the solder into the rosin box. And when we want to tin the original pins, or tin the wires, or solder the original components on the circuit board, we can use the soldering iron tip to put solder in the rosin, and directly tin or weld the original pins, and repair them. Welding etc.
