[TriEmbed] TriEmbed Digest, Vol 25, Issue 42

Thu Jun 25 09:17:23 CDT 2015

Shane and Pete and all, 

Thank you for the recommendations on the Surface Mount MOSFETS.  Since they were not in EAGLE, I have started creating a custom library for each part.  Here is the MOSFET library where I have made the first part (IRF9310P) and will add the N-MOSFET next.  Please take a look and let me know if I should do something differently, For example, should I have just one continuous PAD across all the source and drain pins?  I figured using a custom footprint rather than the standard SOIC-8 would allow for some better connection or thermal tweaks.

Thanks,

Chip

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Here is the data sheet I used to define the footprint - 
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> On Jun 24, 2015, at 1:00 PM, triembed-request at triembed.org wrote:
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> Today's Topics:
> 
>   1. Re: Recommended SMD Logic-Level MOSFETs for prototyping
>      (Shane Trent)
>   2. iOS developer needed part-time (Jon Wolfe)
>   3. Re: iOS developer needed part-time (Robert Gasiorowski)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 23 Jun 2015 15:52:39 -0400
> From: Shane Trent <shanedtrent at gmail.com>
> To: Pete Soper <pete at soper.us>
> Cc: TriEmbed Discussion <triembed at triembed.org>
> Subject: Re: [TriEmbed] Recommended SMD Logic-Level MOSFETs for
> 	prototyping
> Message-ID:
> 	<CAAFjd3ps+0LewCRG17EnKu1MqksoPiXDE0ank8Cj3sB0MVN4SQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> 
> Pete,
> 
> I like the board. I think a library of helper boards could be helpful for
> prototyping. The engineers at Pololu have the best examples I have seen for
> high-current PCB layout with surface mount MOSFETS. This board uses SOIC8
> transistors in a motor driver H-bridge rated for 18 volts and 15 amps. I
> like their multipurpose details on the high-current terminals. They use all
> the copper they can for the terminal pads while allowing the use of screw
> terminals or direct soldering of two different sizes of wire. Beautiful
> design.
> 
> https://www.pololu.com/product/755
> Top image - https://www.pololu.com/picture/view/0J1025
> Bottom image  - https://www.pololu.com/picture/view/0J1026
> 
> Shane
> 
> On Tue, Jun 23, 2015 at 1:45 PM, Pete Soper via TriEmbed <
> triembed at triembed.org> wrote:
> 
>> Great writeup.
>> I found myself searching for "beefy breakouts" for SOIC-8 packages and
>> couldn't find one. I just knocked this out in Eagle and would like comments
>> or criticism:
>> 
>>  http://triembed.org/images/b1.png
>> 
>> (the Eagle files are the same URL but ending FAT-SOIC8.{brd,sch})
>> 
>> This is a dead-simple board except there are redundant traces on the
>> bottom to vias that are in turn connected to the chip pads. So there are
>> two .024" traces for each pin. The vias have relatively large holes I
>> guestimate to have a circumference three times the trace width.
>> 
>> The biggest question is whether this is redundant. If there's an
>> unburdened Eagle file out there that I could upload to OSHPark I might be
>> able to get some boards made in time for the next meeting. This board would
>> cost 47 cents. But the boards I've found so far online have laughably
>> narrow traces for multiple amps.
>> 
>> I notice that the N channel chip you point to can handle pulses over 100
>> amperes. Wow.
>> 
>> -Pete
>> PS Is just crazy some times. A fraction of the time it flagged net
>> connections when I added wires from the via chip pads or else refused to
>> acknowledge the connection. So I'm only 92% sure there would be copper in
>> some cases and the first version of this board might really only have
>> single traces for some of the pins.
>> 
>> 
>> On 06/23/2015 11:22 AM, Shane Trent via TriEmbed wrote:
>> 
>> Someone else asked for recommendations on logic-level MOSFETs so I wrote
>> it up as a blog post.
>> 
>> 
>> http://fettricks.blogspot.com/2015/06/prototype-friendly-smd-logic-level.html
>> 
>> 
>> Shane
>> 
>> --
>> A blog about some of my projects.  http://fettricks.blogspot.com/
>> 
>> 
>> _______________________________________________
>> Triangle, NC Embedded Computing mailing listTriEmbed at triembed.orghttp://mail.triembed.org/mailman/listinfo/triembed_triembed.org
>> TriEmbed web site: http://TriEmbed.org
>> 
>> 
>> 
>> _______________________________________________
>> Triangle, NC Embedded Computing mailing list
>> TriEmbed at triembed.org
>> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
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> 
> 
> -- 
> A blog about some of my projects.  http://fettricks.blogspot.com/
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> ------------------------------
> 
> Message: 2
> Date: Tue, 23 Jun 2015 18:15:17 -0400
> From: Jon Wolfe <jonjwolfe at anibit.com>
> To: TriEmbed Discussion <triembed at triembed.org>
> Subject: [TriEmbed] iOS developer needed part-time
> Message-ID: <42515d35b99fbe8b0a406aee87154f72 at anibit.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> 
> 
> This isn't embedded electronics related, so if you aren't into iOS, you
> can stop reading now ;) 
> 
> I alluded to it at the last meeting, but things are starting to
> solidify, and it looks like I'm going to need to hire an iOS developer. 
> 
> If you are interested in some part time or side work developing an
> iPhone app. Let me know. It's a pretty straightforward app, a few forms
> and menus, that uses REST calls to interact with a server, with possibly
> some camera and SMS interaction. There's no graphics programming needed.
> I will have the server side component and an Android version developed
> in tandem. 
> 
> I'm still working out a few details, such as rates, timeline, etc, but I
> would prefer someone local to RTP that I could meet with on occasion.
> You would need to provide your own equipment for development. 
> 
> Anyways, if you have any interest, contact me. 
> 
> Now back to your regularly scheduled program :) 
> -- 
> 
> Jon Wolfe
> Anibit Technology LLC.
> 
> https://anibit.com
> 
> 
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> ------------------------------
> 
> Message: 3
> Date: Tue, 23 Jun 2015 21:09:04 -0400
> From: Robert Gasiorowski <rgresume at gmail.com>
> To: Jon Wolfe <jonjwolfe at anibit.com>
> Cc: TriEmbed Discussion <triembed at triembed.org>
> Subject: Re: [TriEmbed] iOS developer needed part-time
> Message-ID:
> 	<CAEU50hXPUoEuycAsJKLTe=OoBSHi3i+gJ_UMOKp6a+2H24SucQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> 
> Have you considered using Ionic/Cordova to develop your mobile apps? You
> develop one app and build/deploy to multiple platforms.
> 
> In any case, I would love to get involved in your project, but I am not
> sure I will have enough time to spare.
> 
> Rob.
> 
> On Tue, Jun 23, 2015 at 6:15 PM, Jon Wolfe via TriEmbed <
> triembed at triembed.org> wrote:
> 
>> 
>> 
>> This isn't embedded electronics related, so if you aren't into iOS, you
>> can stop reading now ;)
>> 
>> 
>> 
>> I alluded to it at the last meeting, but things are starting to solidify,
>> and it looks like I'm going to need to hire an iOS developer.
>> 
>> If you are interested in some part time or side work developing an iPhone
>> app. Let me know. It's a pretty straightforward app, a few forms and menus,
>> that uses REST calls to interact with a server, with possibly some camera
>> and SMS interaction. There's no graphics programming needed. I will have
>> the server side component and an Android version developed in tandem.
>> 
>> I'm still working out a few details, such as rates, timeline, etc, but I
>> would prefer someone local to RTP that I could meet with on occasion. You
>> would need to provide your own equipment for development.
>> 
>> Anyways, if you have any interest, contact me.
>> 
>> Now back to your regularly scheduled program :)
>> --
>> 
>> Jon Wolfe
>> Anibit Technology LLC.
>> https://anibit.com
>> 
>> 
>> _______________________________________________
>> Triangle, NC Embedded Computing mailing list
>> TriEmbed at triembed.org
>> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
>> TriEmbed web site: http://TriEmbed.org
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>> 
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> End of TriEmbed Digest, Vol 25, Issue 42
> ****************************************