1. Wiring direction: from the welding face side, the arrangement orientation of the components as far as possible consistent with the schematic diagram, the circuit diagram of the wiring direction is preferably consistent with the alignment direction, as typically required in the production process for detecting various parameters of the welding surface, so This approach facilitates the production of inspection, testing and maintenance (Note: refers to satisfy the premise of the whole circuit performance and installation and panel layout requirements).
2. Arrangement of the components, the distribution must be reasonable and uniform, and strive neat, attractive, well-structured process requirements.
3 resistors, diodes placement: flat and upright is divided into two types:
(1) flat: When the circuit components in small quantities, and the next board size is large, typically using flat better; For less resistance when 1/4W flat, the distance between the two pads general Take 4/10 inches, when 1/2W resistor flat, two-pad spacing generally take 5/10 in.; diode flat, 1N400X series rectifier, generally take 3/10 inches; 1N540X series rectifier, general take 4 to 5/10 inches.
(2) heel: when the number of components in the circuit more, but not the size of the circuit board, the heel is generally used when the distance between the two heel pads generally take 1 to 2/10 inches.
4. Place the principle of potentiometer, IC socket
(1) Potentiometer: The regulator used to regulate the output voltage, so the design should meet the potentiometer to adjust the output voltage increases clockwise and anti-clockwise section of the output voltage is reduced when the regulator; adjustable constant current charger potentiometer is used to adjust the size of the charging current, the design should be full clockwise potentiometer adjustment, the current increases. Potentiometer mounted position should meet the requirements of the whole structure Xuan installation and panel layout, and therefore should be placed at the edge of plate Xuan possible, rotate the handle facing out.
(2) IC Block: printed circuit board design diagram, in the case of using the IC socket, IC must pay special attention to the orientation of the seat positioning groove positioned correctly, and note each IC pin is correct, for example, only 1 foot located in the lower right corner of Block IC line or the upper left corner, and close to the positioning groove (from the welding face).
5. And out of the terminal layout
(1) associated with both ends not lead distance is too large, typically 2 to 3/10 inch or so suitable.
(2) as far as possible into the outlet end of the focus on 1-2 side, not too discrete.
6. Wiring diagram design should pay attention to the order of pin arrangement, component pin spacing to be reasonable.
7. Under the premise of guaranteed circuit performance requirements, the design should strive to walk a reasonable line, less external across the line, according to a certain order requirements along the alignment, and strive intuitive, easy to install, height and maintenance.
8. When designing wiring diagram traces to minimize turn, sought to simple lines.
9. Wiring strip width and line spacing should be moderate, two pad pitch capacitor capacitance should be as consistent with the spacing of the lead foot.
10. Design direction should be in a certain order, for example, can be carried out by order of left to right and top to bottom.
