ok lay it on me, how bad is this power supply pcb/schematic

[sjaltenb]

hello, here is my first schematic and PCB i've ever designed. i read a ton about power supply design and that led me to what i have here, so i could be way off, i just combined a bunch of things. secondaries are 12v@100ma. each PSU will power 1 FX usually 5-20ma max.

I left a bunch of solder pads incase i wanted to run multiple FX. and 10,000 is JUST REPRESENATIVE of some large electrolytic, i'll try a bunch once i get a prototype so i left a ton of room. i always heard its good to have the .1 with the electrolytics, and to also use staggered values after the regulator instead of a single cap. anyways, this is my first so help me out!!!

Its kinda tight right now, with the regulator sitting vetically, with the low current draw of 5ma, i figured no heat sink required. Also, i dont really know the model # im supposed to use for the regulator yet...

anyways, let me know:

[Papa_lazerous]

First thing I would comment on is that the traces are VERY thin you would have no fun making that, I havent looked at the schematic properly but at a glance looks ok. thicken up your traces definately, good start though, it takes some getting used to playing with Eagle

[davent]

Hello,
I don't think you really need all that capacitance before the regulator or after for that matter, i seem to recall in the pedal PS schematics I've seen only 1000uF before and as little as 100uF after. Just looked at the Spyder schematic and for that there's 220uF before and 10uF after.  http://www.geofex.com/Article_Folders/Spyder/Spyder.htm

And like already mentioned widen up the traces and you'll want bigger pads on most of the components shown, the regulator pad width ,  would be a good size for all the pads with the traces slightly narrower, it'll make life easier down the road.

dave

[sjaltenb]

Yeah i dont really think i'll end up with anything over 2200 or so, but i just left room to play as an experiment before i create a final. my entire project has been based on the idea of overdoing everything! Which can be fun, but only if it still works.

[R.G.]

Your components are sitting on top of each other.

Have you read "PCB Layout for Musical Effects"?

[sjaltenb]

Not yet R.G. but its on my Christmas List, seriously! (ok im 23, i dont really have a christmas list but im gonna buy it)

I left the large cap floating over the rectifier just for space purposes.... and the regulator should be vertical but couldnt figure that out 

[OnLyTNT]

Reduce 10.000 uF to 1.000 uF - you don't need such a big capacitance at 100 mA. May be, you can remove 100 uF capacitor and replace 470 uF with 220 uF but I don't think these changes make a big difference. It will allow you to use less space in your design. Don't remove or change 0.1 uF capacitors, they are important. PCB draw is not good enough. Don't draw T intersections and don't let 90 degree corners in your draw, make thicker traces and ground trace thickest as possible as you can. Even, I suggest you to draw a ground plate. And..pads are not supposed to be hexagon . I think, it's an issue with the software.

[sjaltenb]

i have so much to learn 

oh well, gotta start somewhere! I guess i read somewhere that the bigger the filter cap the cleaner the ripple, so of course i took that to the extreme...

Is my use of the diode correct? And do need another one anywhere else? I probably should have read some more stuff before posting this, but i guess i was just excited that i actually did it so i figured i'd post it up. anyways, thanks for any input it is all much appreciated!

[OnLyTNT]

i have so much to learn

Do you think that we learned those informations in a day  . Of course not  .

I guess i read somewhere that the bigger the filter cap the cleaner the ripple

You're totaly correct, but man those 10.000 uF caps are huuuuuge  . A proper smaller cap can do the same job.

Diode placement is fine, you don't need another one in somewhere else.

[sjaltenb]

i have so much to learn

Do you think that we learned those informations in a day  . Of course not  .

I guess i read somewhere that the bigger the filter cap the cleaner the ripple

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You're totaly correct, but man those 10.000 uF caps are huuuuuge  . A proper smaller cap can do the same job.

Diode placement is fine, you don't need another one in somewhere else.

Thanks, well yes it takes time! A very generous member of the forum is helping me out with my layout, which is teaching me a ton! Yeah i know 10,000 is way too much, thats why i said in the first that "10,000 is JUST REPRESENATIVE of some large electrolytic"

Searching on mouser I found some Nichicon"audio grade" electrolytics that look interesting...http://products.nichicon.co.jp/en/pdf/XJA043/e-kw.pdf, but this is for a power suppply FOR audio, not just audio so i dont know if it makes any difference, just sounded neat

[Papa_lazerous]

Here you go mate.......

When I turned off the layer for the values of components to make it clearer it seems I turned off the layer that shows the outer dimension of the board and the hole centres for mounting but the layout is there non the less