[SOLVED] Vias and two layer board design

[Abhijith Yadav]

Hello people,
I am stuck with a small word i came across in Diptrace- 'vias'... Can anyone explain to me what exactly and where exactly a via comes into play? Also, for a design, I am forced to go for two layered etching... I am attaching the PDFs of both the layers... please tell me if there is any problem with the design work and also comment about its heat performance!


View attachment upload_usbasp_top.pdfView attachment upload_usbasp_bottom.pdf

 

[loosemoose]

diptrace is a software package.

 

[pstuckey]

"Vias" are the plated holes that are used to connect between your layers. For instance, J1 has 4 vias in the sketch you posted.

 

[Abhijith Yadav]

How will they affect my etching process

 

[Anonymous_Ricky]

Vias will be drilled in your board as Holes are drilled for Connectors and DIP ICs Pads.

 

[Abhijith Yadav]

How do we make connections across two layers using vias?

 

[pstuckey]

Maybe a picture will help. This shows 4 ground vias between top and bottom layers. The center via is for signal and goes from top layer to an inner layer, and is backdrilled from the bottom to reduce the stub.

 

[Abhijith Yadav]

Do we have to solder the components on both the sides to maintain connectivity across the vias

 

[FvM]

Do we have to solder the components on both the sides to maintain connectivity across the vias

In a DIY PCB, yes. In an industrial manufactured PCB, vias are galvanically throughplated. The technique isn't available for self-made boards. Hollow rivets are sometimes used as a real via replacement, e.g. to contact pads below a component.

 

[Abhijith Yadav]

How to make a hollow rivet?

 

[PCB design]

Its a tin/copper plated fastener fixed on the board, used for continuity of the connection by soldering either sides.