Category:PCB PCB Design Rules

Group Administrators: 0 | Group Member: 189 | Group Threads: 286

Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. If you have many questions of PCB Design, please come here!

Thread Reply
Automotive electronics PCB layout questions Reply 2016-08-07 19:15:04
286 views
3 comments
17 likes

Vojtek Gábor

Leave A Message

Follow

I am studying an ESP sensor cluster, and I have a look at the PCB inside. But there are some questions about it. 1. why do they use only one trace to connect the resistor to the ground? 2. why don't they use teardrops at the trace/via junction?
17 likes
Statement: This post is only the personal view of the author and does not represent the opinions of ALLPCB.com.

Earl Swope

Leave A Message

Follow

Adding the extra + connections to the resistor is with little point, especially if there is little current through it. Teardrops may not have been supported by their PCB design software. I use Eagle, and they are not available.

eb

Leave A Message

Follow

There is no large current requirement here. If this was a Through-Hole Part, it would be done similar to this for thermal reasons.

ercfathi

Leave A Message

Follow

For your second question,it is because teardrops are used to reduce the chance of acid traps and perhaps reduce mechanical stress on the trace and via. However, they are not typically necessary.
ThreadReply