Homebrew_PCBs

is there a set thickness when doing a trace is .050 to small or does
it matter.On the board I just did ,I made most at .125 and the
smallest is .050 is that ok I have not finnished the board but I will
post it tonight I still have to but in all the dill holes but let me
know what you guys think of it so far .


John Brauweiler

John,
Keep the traces that come out of the L298 to the motor
as fat and short as you can. Also the pins that go to the sense
resistors to ground. Also the pin that supplies the plus motor voltage
to the L298. The rest can be thin.


John

--- In Homebrew_PCBs@y..., "marble_h" <marble_h@y...> wrote:
> is there a set thickness when doing a trace is .050 to small or
does
> it matter.On the board I just did ,I made most at .125 and the
> smallest is .050 is that ok I have not finnished the board but I
will
> post it tonight I still have to but in all the dill holes but let
me
> know what you guys think of it so far .
>
>
> John Brauweiler

John,
Don't forget the 8 diodes on the output of the L298. Forget
this if you are using a chip with internal diodes.

John

--- In Homebrew_PCBs@y..., "marble_h" <marble_h@y...> wrote:
> is there a set thickness when doing a trace is .050 to small or
does
> it matter.On the board I just did ,I made most at .125 and the
> smallest is .050 is that ok I have not finnished the board but I
will
> post it tonight I still have to but in all the dill holes but let
me
> know what you guys think of it so far .
>
>
> John Brauweiler

Here is a successful layout, this images highlights the power in blue.
Download the entire set of artwork and you can get a better idea from
it...

http://hans-w.com/powerlines.jpg

hansw

crankorgan wrote:

> John,
> Keep the traces that come out of the L298 to the motor
> as fat and short as you can. Also the pins that go to the sense
> resistors to ground. Also the pin that supplies the plus motor voltage
>
> to the L298. The rest can be thin.
>
>
> John
>
>
>
>
>
>
>
>
>
>
>
> --- In Homebrew_PCBs@y..., "marble_h" <marble_h@y...> wrote:
> > is there a set thickness when doing a trace is .050 to small or
> does
> > it matter.On the board I just did ,I made most at .125 and the
> > smallest is .050 is that ok I have not finnished the board but I
> will
> > post it tonight I still have to but in all the dill holes but let
> me
> > know what you guys think of it so far .
> >
> >
> > John Brauweiler
>
>
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Depends what process your'e going to use for resist. Using laserprinted
paper sheets ironed onto copperclad I get away with 0.02" spacing and trace
widths........ Photoresist will get you down to maybe 0.01" or better.

Lukas

> is there a set thickness when doing a trace is .050 to small or does
> it matter.On the board I just did ,I made most at .125 and the
> smallest is .050 is that ok I have not finnished the board but I will
> post it tonight I still have to but in all the dill holes but let me
> know what you guys think of it so far .
>
>
> John Brauweiler

In a message dated 03-May-02 18:14:33 Central Daylight Time,
marble_h@... writes:

> is there a set thickness when doing a trace is .050 to small or does
> it matter.On the board I just did ,I made most at .125 and the
> smallest is .050 is that ok I have not finnished the board but I will
> post it tonight I still have to but in all the dill holes but let me
> know what you guys think of it so far .

The trace-width depends on TWO things: How much CURRENT ("amps") the trace
must conduct, and how SKILLED you are in making a trace. 0.01" is found on
professional PTH boards!

0.05" wide traces are "healthy", and easy to do "manual" work. 0.125" is
quite wide, actually! You could pass three or four amps through a 1/8" wide
trace with no problem. I forget the site, now, where it describes how to
calculate a trace-width based upon current to flow through it. Someone else
remember it?

Jan Rowland


[Non-text portions of this message have been removed]