— Single-layer PCBs. A layer with conductors is applied to one side of the substrate. Single-layer PCBs are the cheapest and most affordable option. But at the same time, they are the oldest. They are often found in simple household appliances such as remote control for TV.
— Double-layer PCBs. A coating with conductors is applied to both sides of the substrate layer. They have a higher packing density and reliability in comparison with single-layer PCBs. In the Russian market, the share of double layer PCBs ranges from sixty-five to seventy-five percent. Double-layer PCBs are widely used in radio electronics, telecommunications, alarm systems and tracking devices, in modern household appliances, etc.
— Multilayer PCBs. Each layer is a full–fledged insulating plate, all layers are combined in a single electrical circuit using metallized holes. Each layer has printed conductors and a circuit pattern.
Such a multilayer system can be achieved either by gluing two-layer PCBs, or by using a layer-by-layer build-up. With the build-up method, the PCB usually has no more than five layers, but as the technology develops, they can become many times more. Such PCBs are of the highest quality and have very good technical characteristics, stability and other things. But they are also much more expensive.