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 by ohararp ¦  Sun Feb 14, 2010 3:30 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Kapton Solder Paste Stencils ¦  Replies: 7 ¦  Views: 8311

Typically I will edit your gerber files for large pads (Think TO-252) to keep solder paste from going under the stencils by breaking it up as suggested. I could also edit this pretty easily if you indicated that you needed this done in your gerber files.

 by ohararp ¦  Sat Feb 13, 2010 9:22 am ¦  Forum: SparkFun Product Questions ¦  Topic: Kapton Solder Paste Stencils ¦  Replies: 7 ¦  Views: 8311

@lukemalpass - kapton is pretty tough, but I recommend about a 1/16-1/8" piece of plastic. An old credit card or something similar is perfect. The small plastic spackle knives you get at home depot also work well.

 by ohararp ¦  Wed Jan 27, 2010 8:05 am ¦  Forum: PCB Design Questions ¦  Topic: Generic Laser Stencil? ¦  Replies: 5 ¦  Views: 1201

I could see that on a board that maybe you would want a qfn/dfn/tssop stencil to do your fine pitch parts and then do all the passives by hand. However, once you have used a stencil once for all your parts it will be hard to go back. I tell you what...like any good "dealer" the first sample will be ...

 by ohararp ¦  Tue Jan 26, 2010 7:58 am ¦  Forum: PCB Design Questions ¦  Topic: Generic Laser Stencil? ¦  Replies: 5 ¦  Views: 1201

lukemalpass...if you put together a gerber file with what you would like to do I could certainly cut something closer to your specs. Personally, I think a custom stencil for each of your complete pcbs is the way to go.

 by ohararp ¦  Tue Jan 05, 2010 12:55 pm ¦  Forum: SparkFun Product Questions ¦  Topic: PCB houses that do stuffing? ¦  Replies: 23 ¦  Views: 3336

Back on this thread though...I have had shane at Gold Phoenix quote me on some production assembly stuff. I haven't pulled the trigger but their prices were reasonable to stateside quotes I have received.

 by ohararp ¦  Tue Jan 05, 2010 8:06 am ¦  Forum: SparkFun Product Questions ¦  Topic: PCB houses that do stuffing? ¦  Replies: 23 ¦  Views: 3336

I just recently soldered a TI buck boost DFN 4x4 package using a stencil without a problem and a hot plate. Doing somtething like this by hand seems almost impossible to me.

 by ohararp ¦  Tue Dec 29, 2009 6:37 pm ¦  Forum: BatchPCB ¦  Topic: PCB CNC machine ¦  Replies: 76 ¦  Views: 81407

Accurate machine seems super awesome. Can anybody share their plated hole experience or setup for this or similar machines? Methods other than placing a wire and soldering are appreciated.

 by ohararp ¦  Tue Dec 22, 2009 9:27 am ¦  Forum: PCB Design Questions ¦  Topic: SMD Technique #2 - Solder Paste and Hot Plate ¦  Replies: 4 ¦  Views: 1299

angel six...it sounds like you kept your parts on the hot plate for way too long. I would ditch the the temp control. You'll find the insulation of the boards provides a very good profile. I sually set my hot plat to 400F on the dial and after it has warmed up after about 5 mins, then I will place m...

 by ohararp ¦  Sun Dec 06, 2009 9:15 am ¦  Forum: New Product Ideas ¦  Topic: Rapid Prototyping enclosures? ¦  Replies: 21 ¦  Views: 11675

Buzzard, do you have an image of the case you designed and the cost to have it made? I am very interested in the services of envplastics.

 by ohararp ¦  Sat Dec 05, 2009 8:12 pm ¦  Forum: PCB Design Questions ¦  Topic: Driving a mosfet with a microcontroller ¦  Replies: 4 ¦  Views: 2032

I am a big fan of hte load switches available from Fairchild

http://www.fairchildsemi.com/sitesearch ... ontrollers

 by ohararp ¦  Tue Nov 17, 2009 7:36 am ¦  Forum: Wireless/RF ¦  Topic: SMT XBee Sockets ¦  Replies: 5 ¦  Views: 1926

Do you have a picture of the newer explorer boards?

 by ohararp ¦  Wed Sep 16, 2009 11:58 am ¦  Forum: New Product Ideas ¦  Topic: pressure sensor better than scp1000 for altimeter apps ¦  Replies: 31 ¦  Views: 9894

I have a couple of those boards still, no parts, if you are interested in one drop me a line.

 by ohararp ¦  Wed Sep 16, 2009 7:56 am ¦  Forum: New Product Ideas ¦  Topic: pressure sensor better than scp1000 for altimeter apps ¦  Replies: 31 ¦  Views: 9894

Walter, you might find this wiki I did helpful.
http://www.sfcompiler.co.uk/wiki/pmwiki ... er.MS5540C

Overall the chip is pretty awesome. You do need a 32KHz oscillator though and they can be a bit expensive.

 by ohararp ¦  Thu Sep 10, 2009 8:39 am ¦  Forum: PCB Design Questions ¦  Topic: Stencil Printing for fine pitch componets ? ¦  Replies: 11 ¦  Views: 2147

It definitely sounds like your stencil is way too thick. I have found a .003" stencil to be ideal for qfn parts. Additionally, you can individually modify certain pads (in this case I might have mad your qfn pads smaller - say 40% shrinkage).

 by ohararp ¦  Mon Aug 31, 2009 6:39 am ¦  Forum: New Product Ideas ¦  Topic: Blue LED bargraphs? ¦  Replies: 1 ¦  Views: 912

You should send a message to www.curiousinventor.com. I know they use these blue led bar graphs in their stribes.

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