Imposible soldering problem

SexieWASD

Well I'm knee deep into designing a circuit for my guitar to handle switching the coil configuration of three humbuckers as well as volume and tone controls, controlling two graphtech preamps, and communicating with a 4d systems OLED display. I have a TON of I/O traces and the design is getting quite cramped.

I don't think that I'm up for soldering it, I don't believe that I have the skill to pull it off. Does anyone know of a company that could solder the components on, for under $200?


Unfinished design:





EDIT: I really really want a prop with more I/O pins

Post Edited (SexieWASD) : 8/12/2009 7:06:43 PM GMT

jazzed

If you are not using QFN parts, I could do it by hand for much less than $200.

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--Steve


Propalyzer: Propeller PC Logic Analyzer
http://forums.parallax.com/showthread.php?p=788230

Phil Pilgrim (PhiPi)

SexieWASD,

I don't see any filter or bypass caps on your board. You need a filter cap where the power comes in, and at least one ceramic bypass cap for each IC; two or more for the Prop. Also, all of the Prop's Vdd and Vss pins need to be connected. (I'm assuming the LQFP-44 is a Propeller, right?)

-Phil

mctrivia

i can do for under $200 even with BGA or QFN though both of those parts require you make the board correctly. Little brothers is good also though he prefers working with full reals of parts.

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SexieWASD

Yea the LQFP-44 is a prop, but it's not really fully wired in the pic, I am trying to figure out the signal trace routing then work around that.

The power supply isn't on the board yet and will have a separate 3.3v and 5v regulator IC with filter caps for each fed from a 9v battery.
I did not know that each IC would need a bypass cap as well, I fairly new to this and saw this a a good project to get my feet wet with, but it's turned out that fitting this much functionality in such a small space is really hard.

Should all of the vdd pins on the prop have a separate capacitor?

Also I don't think you can tell from the pic, but it's a four layer board with 3.3V and 0V planes in the center two layers


It's good to know that some people on here are willing to freelance solder [noparse]:)[/noparse] of coarse I will have to revise my design first.

Leon

All Vdd pins should be decoupled.

Leon

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Amateur radio callsign: G1HSM
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mctrivia

And just to clarify that means a cap each

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propmod_us and propmod_1x1 are in stock. Only $30. PCB available for $5

Want to make projects and have Gadget Gangster sell them for you? propmod-us_ps_sd and propmod-1x1 are now available for use in your Gadget Gangster Projects.

Need to upload large images or movies for use in the forum. you can do so at uploader.propmodule.com for free.

Phil Pilgrim (PhiPi)

"All Vdd pins should be decoupled."

"And just to clarify that means a cap each."

That's the party line, and you can't go wrong by following it. As a practical matter, though, particularly with a 4-layer board, and if you get cramped for space, two 0.47uF ceramic bypass caps on opposite sides of the Prop package should easily suffice. After all, the DIP40 package has only two sets of Vdd/Vss pins feeding the selfsame die. (Just be sure to connect all the Vdd and Vss pins to +3.3V and Gnd.)

-Phil