The structure of the solenoid valve is mainly composed of coil, core, small spring seat, rubber valve, etc. When the coil is energized, the electromagnetic force overcomes the elastic force of the small spring, and the iron core is sucked …

There are many kinds of photovoltaic cells, such as selenium, cuprous oxide, thallium sulfide, cadmium sulfide, germanium, silicon, and gallium arsenide photocell. Among them, the most important thing is silicon photocell, because of its s…

The concept of on-board chip package ( COB ) is one of the bare chip mount technology. It is one of the microelectronic packaging technologies developed after SMT surface packaging technology. It is the bare chip of the integrated circuit,…