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Re: How would you make a gun cam??

 by macegr ¦  Tue Apr 23, 2013 11:47 pm ¦  Forum: SparkFun Product Questions ¦  Topic: How would you make a gun cam?? ¦  Replies: 12 ¦  Views: 1476

So much potting compound.

Re: How would you make a gun cam??

 by macegr ¦  Fri Apr 19, 2013 11:56 pm ¦  Forum: SparkFun Product Questions ¦  Topic: How would you make a gun cam?? ¦  Replies: 12 ¦  Views: 1476

A GoPro or something seems perfect. However, your main problem will be an optical one. You'll need to figure out how to get a telescopic lens attached to this camera, otherwise the video would mostly be a useless image of an empty sky.

Re: Mechanically attaching PCBs to form polyhedron

 by macegr ¦  Tue Apr 16, 2013 8:55 pm ¦  Forum: PCB Design Questions ¦  Topic: Mechanically attaching PCBs to form polyhedron ¦  Replies: 3 ¦  Views: 841

3D printing. If you need to mass-produce, possibly consider 3D printing some parts and then making silicone molds to cast many parts from 2-part resin.

Re: 40,000.00 PCB

 by macegr ¦  Sun Mar 31, 2013 3:54 am ¦  Forum: PCB Design Questions ¦  Topic: 40,000.00 PCB ¦  Replies: 8 ¦  Views: 1147

That's what happens...someone blazes the trail, and offers what no one else does at the time (BatchPCB). They prove that it's a viable business approach, then over time more competitors enter the same market. At some point you have to decide whether you want to put a lot of effort into competition, ...

Re: Light up "S-Staff" project, questions about batteries

 by macegr ¦  Mon Mar 25, 2013 7:49 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Light up "S-Staff" project, questions about batteries ¦  Replies: 14 ¦  Views: 3624

You may want to consider EL wire. Four or five strands of high-brightness EL wire bundled together and would be lightweight. They are also pretty efficient and produce a single line of light source instead of many small dots.

Re: PCB design

 by macegr ¦  Sat Mar 16, 2013 4:41 pm ¦  Forum: PCB Design Questions ¦  Topic: PCB design ¦  Replies: 6 ¦  Views: 1407

SN75176 is much simpler for half-duplex (three wire) RS485. Nothing too scary about it.

Re: My first PCB ever

 by macegr ¦  Thu Mar 07, 2013 2:30 am ¦  Forum: PCB Design Questions ¦  Topic: My first PCB ever ¦  Replies: 6 ¦  Views: 1312

Looks really good, for a first or even fifth try.

I think it's pretty hilarious that you labeled the LED as "LED" instead of what it means. :D

Re: Eagle PCB and metric vs imperial grids

 by macegr ¦  Fri Feb 01, 2013 12:52 am ¦  Forum: PCB Design Questions ¦  Topic: Eagle PCB and metric vs imperial grids ¦  Replies: 13 ¦  Views: 6621

That's why I have my Command key remapped to Control on my USB keyboard :neutral:

Re: Newbie needs help with reflow.

 by macegr ¦  Thu Jan 24, 2013 4:53 pm ¦  Forum: PCB Design Questions ¦  Topic: Newbie needs help with reflow. ¦  Replies: 24 ¦  Views: 5169

You would definitely want to ask about mylar stencils rather than the pro quality steel ones. Examples: http://www.pololu.com/catalog/product/446 http://ohararp.com/Stencils.html http://www.pcbunlimited.com/flexstencils-mylar-and-kapton-smt-stencils-p-692.html My toaster oven was bone stock. I achie...

Re: Newbie needs help with reflow.

 by macegr ¦  Thu Jan 24, 2013 3:51 pm ¦  Forum: PCB Design Questions ¦  Topic: Newbie needs help with reflow. ¦  Replies: 24 ¦  Views: 5169

For stencils, I go down to TechShop and laser-cut my own out of 2mil mylar. There are various services around that will do the same thing in mylar or kapton, around the $20 range. These stencils are a bit messy and unstable compared to a good stainless steel foil stencil, but they are far better tha...

Re: Alignment of Component Outlines in Eagle

 by macegr ¦  Wed Jan 23, 2013 2:40 pm ¦  Forum: PCB Design Questions ¦  Topic: Alignment of Component Outlines in Eagle ¦  Replies: 3 ¦  Views: 899

When mechanical dimensions are so critical, you need to check everything yourself. You know what size an 0402 resistor is, and you can easily measure the outlines in Eagle.

Re: thermal leave track too thin

 by macegr ¦  Tue Dec 11, 2012 6:16 pm ¦  Forum: PCB Design Questions ¦  Topic: thermal leave track too thin ¦  Replies: 1 ¦  Views: 905

I ASSUME you're using Eagle, correct me if I'm wrong. Thermals to SMD pads on filled supply polygons will be the same size as the "Width" parameter for the polygon, which controls the width of the traces used to construct the polygon. If you have that set to 0 instead of some reasonable number, then...

Re: Eagle. Is it possible to disable the DRC rule, which...

 by macegr ¦  Fri Aug 17, 2012 9:19 am ¦  Forum: PCB Design Questions ¦  Topic: Eagle. Is it possible to disable the DRC rule, which... ¦  Replies: 7 ¦  Views: 2048

Agreed...I prefer to leave good rules the way they are, and make case by case exceptions on my own judgement.

An error in Eagle doesn't mean you did something wrong! You aren't trying to unlock an achievement.

Re: What software Sparkfun uses

 by macegr ¦  Sun Jul 22, 2012 3:43 pm ¦  Forum: PCB Design Questions ¦  Topic: What software Sparkfun uses ¦  Replies: 4 ¦  Views: 1071

Simulation is not always used or needed during the design process. If used at all, it is typically to test behavior of analog sections before prototyping. Full designs are pretty much never simulated. The vast majority of ICs available have no simulation models available, so simulation would only be...

Re: When to not shave the yak

 by macegr ¦  Thu Jul 12, 2012 2:16 pm ¦  Forum: SparkFun Product Questions ¦  Topic: When to not shave the yak ¦  Replies: 10 ¦  Views: 1050

Surface mount is actually faster to solder, even at home with manual placing. Get a stencil, smear down paste, place all the components on the PCB, pop in the toaster oven. Skips the following steps: bending leads, holding part in place, turning board over, solder for a couple seconds on each and ev...

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