Do You Know The Direction Of The Layout Element

1. The design should be carried out in a certain order, for example, from left to right or from top to bottom.

2. The width of the wiring strip and the line spacing should be moderate. The spacing between the two pads of the capacitor should match the spacing of the capacitor lead pins as much as possible.

3. When designing the wiring diagram, the routing should be as few bends as possible, and the lines should be simple and clear.

4. When designing the wiring diagram, pay attention to the order of the pins, and the spacing between the pins of the components should be reasonable.

5. Wiring direction:

From the soldering surface, the arrangement of the components should be as consistent as possible with the schematic diagram, and the wiring direction should be consistent with the wiring direction of the circuit diagram. Since the production process usually needs to detect various parameters on the soldering surface, it is convenient to do inspection, debugging and overhaul during production(Note: Refers to the premise of meeting the requirements of circuit performance, installation and panel layout)

6. Under the premise of ensuring the performance requirements of the circuit, the design should strive for reasonable wiring, use less external jumpers, and follow certain requirements for wiring, striving for intuitiveness, easy installation, height and maintenance.

7. The arrangement and distribution of the components should be reasonable and uniform, and strive to be tidy, beautiful, and rigorously structured.

8. Incoming and outgoing terminal arrangement direction

(1) The distance between the associated two leads should not be too large, generally about 0.2-0.3 inches is more appropriate.

(2) The incoming and outgoing wire ends should be concentrated on 1 to 2 sides as much as possible, not too discrete.

9. Potentiometer: placement principle of IC holder

(1) Potentiometer: It is used to adjust the output voltage in the voltage regulator, so the design potentiometer should meet the increase of the output voltage during clockwise adjustment and the decrease of the output voltage during the counterclockwise adjustment; in the adjustable constant current charger, the potentiometer is used to adjust the size of the charging current. When designing the potentiometer, the current should increase when it is adjusted clockwise. The position of the potentiometer should meet the requirements for the installation of the whole machine and the layout of the panel, so it should be placed on the edge of the board as far as possible, with the rotating handle facing outward.

(2) IC seat: When designing printed board drawings, when using the IC holder, be sure to pay special attention to the correct positioning of groove on the IC holder, and pay attention to the correct positioning of each IC pin. For example, the first pin can only located in the lower right corner of the IC holder or the upper left corner, and close to the positioning groove (as viewed from the soldering surface).

10. The placement direction of resistance and diode in pcb layout:

PCB design is divided into two types: horizontal and vertical:

(1) Horizontal placement: When the number of circuit components is not large, and the size of the circuit board is large, it is generally better to use horizontal placement; When the resistor below 0.25W is placed flat, the distance between the two pads is generally 0.4 inches; When the 0.5W resistor is placed flat, the distance between the two pads is generally 0.5 inches;When the diode is placed flat, the 1N400X series rectifier tube is generally 0.3 inches; the 1N540X series rectifier tube is generally 0.4-0.5 inches.

(2) Vertical placement: When the number of circuit components is large, and the size of the circuit board is not large, it is generally better to use vertical placement in PCB design. When placed vertically, the spacing between the two pads is generally 0.1-0.2 inches.