Surface SMT stands for Surface Mount Technology - components are soldered on this side of the board, from which they are, they are SMD components - called Surface Mount Device. The plate drops of adhesive are applied, then the electronic components are arranged, and the adhesive is cured, then ends are connected by soldering the conductive paths.
Through hole THT stands for Through-Hole Technology - electronic components are mounted exit hole in the form of wires that are threaded through the prepared holes in the plates and soldered on the opposite side of the plate.
Printed circuit board PCB is a plate of insulating material with electrical connections called. paths and solder points for the installation of electronic components. The printed circuit board may be single, double or multi-layer (the inner layer)..
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