The choice of printed circuit board external connection

Selection of external connection Mode of printed Circuit Board

The printed circuit board must have the problem of external connection. The connection methods include wire welding, connector connection and so on.
Form.
1. Wire welding
Wire welding is a simple, inexpensive and reliable way to connect without any plug-in.
The external connection point of the wire welding PCB and the components outside the board can be made into other parts: the horn in the radio, the battery, the rotary group potentiometer switch in the electric production equipment, and so on, are all connected by wire welding. This method is characterized by low cost and high reliability, but it is not easy to maintain in the case of few external leads.
The following points need to be noted for wire welding.
The external points of the circuit version should be directed to the edge of the board. The ruler and spacing should be integrated to facilitate welding and maintenance, and the wires should be arranged neatly,  and sublines and boards should be arranged through wire clips or other fasteners.

2) in order to improve the mechanical strength of the wire connection and to prevent the wire from being pulled off the pad or printed line, it is best to drill a hole near the solder joint on the printed board to allow the wire to bypass the through hole from the welding surface of the circuit board, Then weld the pad hole from the element surface, Connector connection
Connectors are usually used in more complex instruments and equipment. The connection of insert part is that the external connection point on printed circuit board is connected by socket and off-board components. There are a wide variety of connectors, as follows.
Printed socket.  printed plugs are made at the edge of the printed circuit board and can be connected to the printed socket dedicated to the printed circuit board. This connection is convenient for maintenance and replacement and is suitable for mass production.

Other inserts. The external connectors of printed boards also include rectangular inserts, D-shaped inserts, circular inserts, and other types of connectorsWhen the printed circuit board external connection line is less often use the bar plug, such as the PC power line, sound card and CD ROM tone line, and so on.
If the printed circuit board has a large current signal external connection, you can use a rectangular connector. The plug is usually connected by flat cable. This kind of socket is too large to be straight
                       From Allicdata