Search found 380 matches

by macegr
Tue Apr 23, 2013 11:47 pm
Forum: SparkFun Product Questions
Topic: How would you make a gun cam??
Replies: 12
Views: 1280

Re: How would you make a gun cam??

So much potting compound.
by macegr
Fri Apr 19, 2013 11:56 pm
Forum: SparkFun Product Questions
Topic: How would you make a gun cam??
Replies: 12
Views: 1280

Re: How would you make a gun cam??

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.
by macegr
Tue Apr 16, 2013 8:55 pm
Forum: PCB Design Questions
Topic: Mechanically attaching PCBs to form polyhedron
Replies: 3
Views: 735

Re: Mechanically attaching PCBs to form polyhedron

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.
by macegr
Sun Mar 31, 2013 3:54 am
Forum: PCB Design Questions
Topic: 40,000.00 PCB
Replies: 8
Views: 1104

Re: 40,000.00 PCB

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, ...
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: 3401

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

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.
by macegr
Sat Mar 16, 2013 4:41 pm
Forum: PCB Design Questions
Topic: PCB design
Replies: 6
Views: 1340

Re: PCB design

SN75176 is much simpler for half-duplex (three wire) RS485. Nothing too scary about it.
by macegr
Thu Mar 07, 2013 2:30 am
Forum: PCB Design Questions
Topic: My first PCB ever
Replies: 6
Views: 1272

Re: My first PCB ever

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
by macegr
Fri Feb 01, 2013 12:52 am
Forum: PCB Design Questions
Topic: Eagle PCB and metric vs imperial grids
Replies: 13
Views: 6459

Re: Eagle PCB and metric vs imperial grids

That's why I have my Command key remapped to Control on my USB keyboard :neutral:
by macegr
Thu Jan 24, 2013 4:53 pm
Forum: PCB Design Questions
Topic: Newbie needs help with reflow.
Replies: 24
Views: 4941

Re: Newbie needs help with reflow.

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...
by macegr
Thu Jan 24, 2013 3:51 pm
Forum: PCB Design Questions
Topic: Newbie needs help with reflow.
Replies: 24
Views: 4941

Re: Newbie needs help with reflow.

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...
by macegr
Wed Jan 23, 2013 2:40 pm
Forum: PCB Design Questions
Topic: Alignment of Component Outlines in Eagle
Replies: 3
Views: 872

Re: Alignment of Component Outlines in Eagle

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.
by macegr
Tue Dec 11, 2012 6:16 pm
Forum: PCB Design Questions
Topic: thermal leave track too thin
Replies: 1
Views: 820

Re: thermal leave track too thin

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...
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: 1944

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

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.
by macegr
Sun Jul 22, 2012 3:43 pm
Forum: PCB Design Questions
Topic: What software Sparkfun uses
Replies: 4
Views: 986

Re: What software Sparkfun uses

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...
by macegr
Thu Jul 12, 2012 2:16 pm
Forum: SparkFun Product Questions
Topic: When to not shave the yak
Replies: 10
Views: 994

Re: When to not shave the yak

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...