How to reduce the harm caused by harmful substances to the human body? Electronic manufacturers need to lay out their operating premises in this way: the most powerful Electronic Manufacturing Services company.
The testing team at the production base can ignore the resistance between any component and ground. The proof of production capacity should meet ISO standards, and the number of test points should be as close or as low as possible.
Understand different types of solder joints. The surface of different types of solder joints may be copper, just like some small wires, and their contacts may be yellow or green, and your conductive wire may be green or green,
Most welded surfaces are those that will be coated, which will be considered green. In fact, when you must prevent welding of surface coatings, the welding material at this time is blue.
However, they cannot prevent yellowing or yellowing problems, which are some of the most common plastics. Blue is the most common plastic, and red is the most common glass. Black is a common plastic. Therefore, they contain metallic components.
You must prevent oxidation of the welding surface coating and solder on the components. This is not harmless, but the main cause of weldability issues. Otherwise, the following methods are required to address weldability issues.
Thermistor () is a type of sensitive element, whose resistance decreases with increasing temperature and has a very low resistance at room temperature. Compared with ordinary resistors, using a thermistor also has certain errors. Therefore, the measurement accuracy of thermistors should reach ± 05~± 1%.
When the temperature exceeds ± 1 ° C or ± 3%, the resistance value begins to decrease and the temperature rise reaches a high point. When the temperature exceeds ± 3 ° C and is below ± 3%, the resistance value begins to decrease and the temperature rise gradually increases to Δ T1.


Varistor is a kind of resistance device with nonlinear volt ampere characteristics. It is mainly used to clamp the voltage when the circuit is under overvoltage, and absorb excess current to protect the sensitive device. Function of varistor: When the voltage exceeds the threshold voltage V of the varistor, the varistor starts to turn on, and the current rises sharply to a faster and higher peak, which is extremely important for the varistor. Ordinary varistor are used to suppress transient surges, but for high-frequency circuits, resistance varistors are generally used. It is not a complete solution for suppressing transients. It is excellent in terms of voltage and current continuity.
They are also an energy harvesting element that can be converted into energy for devices such as rectifiers, transistors, or rectifiers.
It has a large capacity capacitor, output diode and switched capacitor, and can simply collect energy in a unit. From the perspective of capacity and efficiency, resonant capacitors may be more suitable for miniaturized electronic devices.
Resonant capacitors have the same characteristics as resonant capacitors, and they are no exception. Resonant capacitors typically operate at low frequencies, but their impedance characteristics are satisfactory at high frequencies, typically 2-3 times smaller than the DC load capacitors used.