Hi, I'm a total eagle beginner, and I've just made my first schematic and board. Could you please check it, if it's usable? Thanks 
Hi, I'm a total eagle beginner, and I've just made my first schematic and board. Could you please check it, if it's usable? Thanks
On 20.07.2015 00:56, Jacob Sycha wrote:
Hi, I'm a total eagle beginner, and I've just made my first schematic
and board. Could you please check it, if it's usable? Thanks
First impressions:
-Double sided board seems overkill for this simple circuit. See if you
can make it single layer.
-Track thickness is very thin. Thin tracks are harder to manufacture.
-You can probably compress pcb size to a minimum.
-Wire bends are a bit untidy.
-For schematic, there is alot of unnecessary junctions. There is no need
for junctions at pin connections, or at 90deg bends.
-The 555 timer seems to already exist (several times) in Eagle libraries
A more critical look:
-I opened this is eagle 6.5.4, and I ERC errors:
-consistancy error :net class parameters differs in brd vs sch
-consistancy error :LED naming different in brd vs sch
-U1 pin 5(CONT) is defined as an input but doesnt have any input (this
could mean the U1 could go nuts, or library component pin direction for
pin 5 is wrong). Taking a quick look at the datasheet, I'd suggest
putting a capacitor on this pin to gnd, but I do not know this circit.
Since I'm unsecure, I would just put it in and worry about soldering it
later.
ERC Warnings:
-Missing juction at the CONN xref
-VDD power pin of U1 connected to N$1 (Eagle expects pins with direction
POWER to be connected to a net with same name as the pin)
-LED1 is missing a value
DRC issues:
-For this kind of board, I would make larger distance between pads and
wire (fill).
-There are some weird stuff left on stop mask around pin 4 of U1. It
seems to be in the package definition.
-Capacitor package has capacitor symbol on pads. They will be shaved off
by the manufacturer but if you do want silk screen, I'd remove it from
package.
Finally, I have a personal preference for SMD components for small
projects. Drilling is just unnecessary work, and soldering SMD runs
smooth after some practice. Im sure you can find tutorials on youtube.
I also prefer to have sensible netnames that can quickly point you back
to schematic when reviewing the layout.
I did some homework for you and attached the cleanup I did to your
project. Compare it with yours 
Use 7zip.org to unpack.
