(1) First and foremost, the PCB size should be considered. If the PCB is too large, the printed lines will be longer, leading to increased impedance, reduced noise immunity, and higher costs. Conversely, if it's too small, heat dissipation will be poor, and adjacent lines are more prone to interference. The circuit board is rectangular with a length-to-width ratio of 3:2 or 4:3. Components located on the edges of the circuit board are generally not less than 2mm from the edge.
(2) When placing components, consider future welding and avoid packing them too closely.
(3) Center the layout around the core components of each functional circuit. Components should be evenly, neatly, and compactly arranged on the PCB, with an effort to minimize and shorten the leads and connections between components. Decoupling capacitors should be as close as possible to the VCC of the devices. Aviation ground power 2, 36V aviation power 1, 400Hz frequency conversion power supply 7, 115/200V power supply 2, 27V DC power supply 5, 400Hz power supply 12, aviation power supply.
(4) In conditions of high-frequency operation, it's essential to consider the distributed parameters between components. That's why the circuit should, as much as possible, arrange components in parallel. This not only ensures aesthetic appeal but also makes assembly and soldering easier, facilitating mass production.
(5) By arranging the positions of functional circuit units according to the circuit's flow, the layout can facilitate signal flow, thereby ensuring signals maintain a consistent directional alignment.
The primary principle in layout is to ensure the wiring connectivity rate. When moving components, be mindful of the connections of the flying wires, and place components with wired relationships together.
(7) Minimize loop area as much as possible to suppress the radiation interference of the variable frequency power supply.
