1. When laying copper on the PCB, punch holes in the copper, some holes are connected by crosshairs, and some are not. Why?
2. The holes punched on the copper by pcb can be conductive, then if the double-layer PCB design is carried out, both the upper and lower layers are covered with copper. At this time, when making a hole, the upper and lower layers will not be cut. The copper is connected together. At this time, the components connected by the copper are connected together soon, will there be a short circuit?
Lennon Posted on July 10, 2020
Whether the cross is mainly determined by the software, the cross is automatically paved within the safe distance;
The second problem is that the same network is naturally connected to each other; if it is not the same network, you will get an error if you put it on. You have to re-lay it.
Dorian Posted on July 10, 2020
Brother, the cross pad is because the electrical network nodes around the copper and the pad are the same. For example, the pad is GND, and the copper is also GND. The two are close together and there will be this cross, which is used to connect the same electrical nodes together.
As for the double-layer board pad and the through hole communicating up and down because the upper and lower points are the same electrical network node. The two sides connected by each via or pad must be the same node and will not be short-circuited.
Franklin Posted on July 10, 2020
You set the distance between the pad and the copper. The size of the dead zone will cause some vias without crosses. Or if your via is not set with a network label, it is just a via and no one is connected.
Khalil Posted on July 10, 2020
1. Whether the PCB copper is fully connected or cross-line connection depends on your settings. There is a SHAPE connection property setting item in ALLEGRO.
2. Holes can carry network attributes, only those with network attributes will be connected, and those without network attributes will be avoided.
