Help with board layout in Eagle

[aflynt]

Hello,

This is my first crack at a board layout in Eagle. It's basically a combination of a modded Fuzz Face and modded Range Master designed to fit in a sideways 1590BB.  Any tips for how to improve it? Could the power trace going under the Range Master input caps be a source of hum?

Thanks,
-Aaron

[defaced]

Without a schematic and no pad labeled "RIN", I have no clue about the power line under the Range Master input cap. 

Random comments:
What's up with the non-pads at the top of the board?
You've got an unlabeled pad coming from the 2.2 uf cap after the 27k input resistor on the FF. Not sure what that's about. 
You can seriously squish the layout.  It's probably 2x the size it needs to be from as physical standpoint.  Prototyping will tell you if it'll work (quietly/stably) or not. 
Watch your grounding.  You've got a ground pad for each circuit and a shared ground plane.  That is a recipe for a ground loop. 

[diemilchmann]

as my experience with EAGLE slowly grows, i find that i can fit larger and larger circuits on smaller and smaller boards. And I had that mistake about a ground loop one time too. Defaced is right.

[aflynt]

Here's the schematic. It's designed to have the fuzz before the RM both independently switchable. Basically just in/out/9vdc jacs, and 2 3pdts w/leds for off board wiring. The extra holes at the top are for wire strain relief. The extra pads next to the cap pads are to accomodate different sizes (not sure if I'll settle on poly or electo for C1). I probably am using a lot more space than necessary, but I'm just using the board for the one pedal fitting in a 1590BB so my main consideration was putting the pads in convenient places for the off board wiring.

The FGND pad was going to go to the input jack ground which would then feed DC jack ground and fuzz switch/led ground. RGND was going to feed the switch/led ground for the Range Master, but if I'm understanding what your getting at, it would be better to eliminate RGND and just daisy chain the grounds of the two 3pdt's, correct?

[cpm]

Random comments:
What's up with the non-pads at the top of the board?

my guess is they are holes to inster wires. Thats a good way to avoid stress on solder joints.

You've got an unlabeled pad coming from the 2.2 uf cap after the 27k input resistor on the FF. Not sure what that's about.

looks like a pad to allow different capacitor pitch sizes

You can seriously squish the layout.  It's probably 2x the size it needs to be from as physical standpoint.  Prototyping will tell you if it'll work (quietly/stably) or not.

true. With that circuit i would try to fit the board vertical on the box, some of them has rail holders on the sides for this purpose.

[aflynt]

true. With that circuit i would try to fit the board vertical on the box, some of them has rail holders on the sides for this purpose.

I've already got a sloppy version with separate boards wired up and in use on my pedalboard in a sideways 1590BB and I'm too lazy to buy and drill a new enclosure.