On Tue, 29 Jan 2013 04:08:49 -0000, you wrote:
>I am definitely progressing, I have a board designed, trying to learn how to run traces on both sides of the board. I also think I need help figuring out how to create a new component, a PZT3904 transistor. I've been to youtube and sparkfun, both have decent tutorials, just not sure what I'm doing yet. Is it possible to run traces underneath 0805 resistors? So far when I've done that, I've run into problems with the traces touching the pads. I think I'm pretty close to the printing phase. Thanks! AJ
If the traces are on the other side of the board (blue rather than
red), you can run them anyway you want. You could have two
independent circuits laid out anyway you want if you used only SMT
parts.
If the traces are fine enough, you can run them between the pads of a
SMT part, but you do need to be careful.
To make a part, you make the layout first (and see if there's one
already, I suspect that you can match the case style to a generic
transistor, use it, and then change the part value to your transistor.
I am fairly sure that there's a surface mount 2n3904 in there, try the
MMBT3904 if I can remember the part number. It may be the same part.
I generally lay out the pads on a part first, then the outline, that
makes the part. Then make the schematic symbol (or use an existing
one of either part or symbol).
Then make the part itself, adding the schematic symbol, then pick a
part outline, then connect each pad to a pin on the part.
Look at existing parts that are similar to see how it's done.
Harvey
>
>--- In Homebrew_PCBs@yahoogroups.com, Boots Hughston wrote:
>>
>> In Eagle you have to place your components yourself. Once you have done that then you can run the auto router.
>> Order of performance:
>> Design your circuit.
>> Run design rule check, correct all errors.
>> Then go to board view.
>> Place your components.
>> Setup the auto router.
>> Run the auto router.
>> Run design check.
>> Correct errors.
>>
>> Good luck,
>> With respect, Boots-2b1
>>
>>
>>
>> Sent from my iPhone
>>
>> On Jan 15, 2013, at 8:26 PM, "AJ" wrote:
>>
>> > I am completely new to PCB design, I put together a schematic for a class project for a SMD FM transmitter. Everything looked great but when I switched over to the board layout view, everything seemed to get jumbled up. I tried the autoroute feature and couldn't figure it out. I have another program called Livewire which is extremely simple to put together, but, it's not tweakable for different sized of components. I've youtubed videos trying to figure it out... My project is due in 2 1/2 weeks, hopefully I don't need to switch to a standard breadboard. Any advice would be GREATLY appreciated!
>> >
>> > AJ
>> >
>> >
>>
>>
>> [Non-text portions of this message have been removed]
>>
>