5.4.types of printed circuits
1.printed circuit with uni face :
it contain one surface of cupper (35 micron) and under it the isolation surface (1.6mm).
2.printed circuit with double surfaces :
it contain two surfaces of copper (35 micron) between them is the isolation surface (1.6mm)
3.printed circuit with multi surfaces :
it consists of several faces of cupper (35micron) between each face and other an isolated surface (1.6mm)