There's a very brief comment hidden in the PIC18F4550 documentation that a
0.22 (or even 0.47) uf cap is needed from Vusb - ground.  I recently
purchased one of Microchip's dev boards that didn't have this cap, and the
board was not properly enumerated as a USB device until I added it.
Surprising to me that a board that's been around for a few years would have
an error like that.

Regarding the schmetics, drawing an understandable schematic is definitely
at art.  I agree with one of the other replies that I like caps to be
generally vertical.  The bypass caps between Vdd and Vss caused me to do a
doubletake - I had to look closely to sort out their function in my mind.

One additonal comment....where I have connections going in 2 directions,
around the LEDs for example, I usually line up the junctions, one part going
up, the other down in this case, just to minimize the number of junctions on
the page.

Jon


On Fri, Dec 25, 2009 at 6:45 PM, Nathan House <nathanpiclist@gmail.com>wrote:

> I have never formally been taught how to draw schematics, and I am
> wondering
> which way I should draw the oscillator circuit in the schematic below?
>
> #1 http://img132.imageshack.us/img132/1897/17010423.png
> #2 http://img269.imageshack.us/img269/120/57384617.png
>
> If you think they are both bad (or have any suggestions on how I can
> improve
> the schematic) I would really appreciate your input.
>
> Thanks,
>
> Nathan
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