1. The appearance and internal structure of bread board are shown in the above figure. The common smallest unit bread board is divided into three parts: upper, middle and lower. The upper and lower parts are generally narrow strips consisting of one or two rows of jacks, and the middle part is a strip consisting of a middle isolation groove and five rows of jacks.

2. There is no electrical connection between the upper and lower wires of the narrow band. Every five jacks are grouped (usually called "islands"), and there are usually 10 groups on the bread board. This 10 group "island" generally has three internal communication structures: ① five groups on the left are electrically connected, and five groups on the right are electrically connected, but the left and right sides are not connected. This structure is usually called 5-5 structure.

3.② The left three groups are electrically connected, the middle four groups are electrically connected, and the right three groups are electrically connected, but the left three groups, the middle four groups and the right three groups are not connected. This structure is usually called 3-4-3 structure. ③ Another structure is that 10 groups of "islands" are all connected, which is the simplest structure.

4. The wide strip in the middle consists of an isolation groove in the middle and five rows of jacks up and down. Five jacks in the same column are connected with each other, but the column is not connected with the upper and lower parts of the slot.

Extended data:

Tectonic characteristics

The whole board is made of thermosetting phenolic resin, and there are metal strips at the bottom of the board, which are made by punching holes at the corresponding positions of the board.

When the component is inserted into the hole, it can contact with the metal strip, thus achieving the purpose of conducting electricity. Usually, every five orifice plates are connected by a metal strip. There is generally a groove in the center of the circuit board, which is designed for testing integrated circuits and chips. There are two rows of vertical jacks on both sides of the board, which are also a group of five. These two groups of jacks are used to supply power to the components on the board.

The main board is made of glass fiber board with copper foil conductive layer, which is used to fix the solderless bread board and lead out the power terminal.

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