traces and spaces are standard as you say, there are guidelines for various circuits, and some prototype houses will give guidance or minimum requirements ... later we can talk about good layout, design for manufacturing / design for assembly type issues -- I hope you will touch on that later as well
I think it's wonderful that MIT has Open CourseWare LINK -->> http://ocw.mit.edu/index.htm and that we have an instructor from MIT here online too ... I loved the work done there by Winston and Horn ...
Thanks so much for your great presentation today, Carol. I look forward to seeing everyone for the third presentation tomorrow -- Using PCB Layout Software: Custom Component Libraries.
To the question about using CFD to do thermal model. I've done some and have used consultants who specialize in it. Here's my take on the subject. If it's a straight forward application, just measure the temperatures with a thermocouple and extrapolate. If it's complex geometry you might want to model it. But what you get out of it depends on what you put in. You still have to prototype it and get some anchor points and verification for your thermal model. Sometimes the answers are about what you expect. Sometimes experience helps you know what to expect. There are some rules of thumbs for power supplies: efficiency, power/square inch, should guide you on whether and how big a heat sink you need. I believe Ron goes over these in his book Practical Design of Power Supplies.
DesignSpark has an autorouter. Under Tools menu, Autorout Nets.
I don't generally use it for power supplies. EMI considerations for component placement and packing it into a small space are usually my two biggest drivers.
Looks like you'd make it work just like Carol made it work for Digikey by adding the info when creating your parts. The included libraries appear to be built with RS components. I believe that is a UK distributor. Perhaps Carol can clear this up.
Can you comment on the use of CFD/FE on thermal desing? Many people are using it, but many companies have deep pockets. Is it necessary or even useful?
Carol, do you have suggestions for ensuring the schematic pins match up correctly with the PCB pads? I have seen a lot of boards messed up because things like the transistor pins don't match, especially with SOT and similar packages.
Carol, do you have suggestions for ensuring the schematic pins match up correctly with the PCB pads? I have seen a lot of boards messed up because things like the transistor pins don't match, especially with SOT and similar packages.
@stagners: Looks like you'd make it work just like Carol made it work for Digikey by adding the info when creating your parts. The included libraries appear to be built with RS components. I believe that is a UK distributor. Perhaps Carol can clear this up.
@cmeadows6959, I downloaded and activated DesignSpark yesterday. The latest version, 3 has an interface to common simulators. the website describes it better.
For some reason, it's the updated Flash that is having problems with audio. The IT folks are working on it. Using the Chrome browser seems to solve the problem.
If you have trouble hearing the audio, one of our attendees noted that it's not a browser problem, per se, it's an Adobe Flash version problem. -- If you've upgraded to Flash 11.4, you'll have problems. Right click on the Flash player to check its version number. Browsers still using Flash 11.3 are working for this webinar; those at 11.4 are not working.
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