At 11:27 AM 5/8/2005 -0700, you wrote:
>Great posts this past week, I've learned alot;
>especially about using C. This list is awesome.
>
>I have a basice PCB layout, 5 (Analog) inputs/5
>(digital)outputs. I wanted to post it to the board and
>see if it looks right, also...if there is something
>wrong I can place the whole PCB and corresponding
>information out there for other people to make boards.
>
>What may seem unusual in the board are TWO Caps, one
>for the initial input power and one for 5V after the
>regulator. (anyone else do this?)
>
>Cheers - AL

The input capacitor on the 5V regulator is a good idea.
The large output cap may or may not be required for stability,
depending on the regulator you use. You need a bypass close to the
PIC 0.01uF to 1uF ceramic will do it (0.1uF is commonly used)

Why is the 25uF high voltage cap larger than the 10uF low voltage cap?

Don't connect the resonator ground trace to the connector, run it back
separately to Vss on the chip.

The LED is backwards.

Try to increase the size of your pads and traces (especially on things
like the switch), and route traces between IC pins straight to maximize
copper and clearances. Are you sure the switch holes are big enough?

That's all I see with a quick glance. I didn't try to figure out your
battery and other connectors. Your inputs have no added ESD protection.

Best regards,


Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com




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