[TriEmbed] TriEmbed Digest, Vol 25, Issue 43

Chip McClelland chip at mcclellands.org
Thu Jun 25 09:29:26 CDT 2015


To all, 

Sorry for not getting this right on the first two attempts.  Here is a link <https://www.dropbox.com/sh/9qdzturvffr66do/AAAv0D0bogqsjLA9GiF5-DD6a?dl=0> to my dropbox where the PDF and the EAGLE custom MOSFET library are stored: 

Also, I am toying with the idea of contributing some of my custom footrprints to this ambitious project to share footprints for surface mount parts.- SnapEDA <http://www.snapeda.com/home>  So far, I have not been impressed with the designs I have seen but, it could grow up to be a cool solution and reduce the amount of time I have to spend designing custom libraries like the one linked to above.  

Thanks,

Chip

> On Jun 25, 2015, at 10:20 AM, triembed-request at triembed.org wrote:
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> Today's Topics:
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>   1. Re: TriEmbed Digest, Vol 25, Issue 42 (Chip McClelland)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 25 Jun 2015 10:20:08 -0400
> From: Chip McClelland <chip at mcclellands.org>
> To: triembed at triembed.org
> Subject: Re: [TriEmbed] TriEmbed Digest, Vol 25, Issue 42
> Message-ID: <C5FEC22C-496D-42FC-BCFC-49CAA530C1EF at mcclellands.org>
> Content-Type: text/plain; charset="us-ascii"
> 
> 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
> 
> Here is a link to the data sheet I used to define the footprint - http://www.irf.com/product-info/datasheets/data/irf9310pbf.pdf <http://www.irf.com/product-info/datasheets/data/irf9310pbf.pdf>
> 
> 
>> 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
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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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