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Re: Micro-Blower

 by ohararp ¦  Thu Jun 30, 2011 7:25 am ¦  Forum: New Product Ideas ¦  Topic: Micro-Blower ¦  Replies: 5 ¦  Views: 5825

Although, this is total spam, it is still very interesting. So where are all the details on driving this board etc. IF you actually shared more information rather than linking to the rather uninformative website I think this could actually be beneficial to some folks.

Re: Solder Paste Selection

 by ohararp ¦  Sun Mar 13, 2011 11:16 pm ¦  Forum: PCB Design Questions ¦  Topic: Solder Paste Selection ¦  Replies: 7 ¦  Views: 1406

I prefer Stanley for Solder Paste, 35 gram jar is half the price here vs digikey - http://www.stanleysupplyservices.com/pr ... pn=143-782

Re: Scorching on PCBs with no solder mask

 by ohararp ¦  Tue Mar 08, 2011 7:17 am ¦  Forum: PCB Design Questions ¦  Topic: Scorching on PCBs with no solder mask ¦  Replies: 4 ¦  Views: 1377

jmbw, when using a hot air reflow gun I find the non-solder mask guys are a bit more sensitive. I wouldn't use the lead free paste in this case. The soldermask seems to make a huge difference in temperature capability.

Re: SMT Station -- HotAir or InfraRed?

 by ohararp ¦  Mon Feb 28, 2011 8:49 pm ¦  Forum: PCB Design Questions ¦  Topic: SMT Station -- HotAir or InfraRed? ¦  Replies: 3 ¦  Views: 2489

I just saw this thread at http://www.eevblog.com/forum/index.php?topic=1847.0 . Definitely check the video at the top for a great how-to.

Re: Vehicle Tracking

 by ohararp ¦  Mon Feb 07, 2011 8:14 am ¦  Forum: GPS ¦  Topic: Vehicle Tracking ¦  Replies: 12 ¦  Views: 2259

Would something like this work for you? - http://ohararp.com/wp/?p=119

Re: temperature sensor

 by ohararp ¦  Sun Feb 06, 2011 9:29 pm ¦  Forum: SparkFun Product Questions ¦  Topic: temperature sensor ¦  Replies: 34 ¦  Views: 3917

In terms of sensors you should checkout http://www.ibuttonlink.com/sensors.aspx for a single sensore on a wire

or if you wanted to get fancy you get run a single wire with multiple sensors at different height all on the same bus. http://www.ibuttonlink.com/tstring.aspx

Re: Calling all LED nuts

 by ohararp ¦  Sat Dec 11, 2010 10:17 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Calling all LED nuts ¦  Replies: 9 ¦  Views: 1013

garrett, when using a higher voltage say 30V are there any issues to be aware of (i.e. does the Vf of the series leds have to be within a certain threshold of VCC)? It wasn't clear to me in the datasheet if there were any constraints in terms of the Vled levels and the required voltage drop.

Re: 10x16 RGB array -- Open Source HW&SW

 by ohararp ¦  Sat Dec 11, 2010 3:17 pm ¦  Forum: Arduino ¦  Topic: 10x16 RGB array -- Open Source HW&SW ¦  Replies: 3 ¦  Views: 1028

Justin, can you confirm the source code is programmed in the Arduino ide? If not, what compiler is used?

Re: Calling all LED nuts

 by ohararp ¦  Sat Dec 11, 2010 9:44 am ¦  Forum: SparkFun Product Questions ¦  Topic: Calling all LED nuts ¦  Replies: 9 ¦  Views: 1013

Jim, this is the chip you need http://www.mouser.com/ProductDetail/Texas-Instruments/TLC5947DAP/?qs=sGAEpiMZZMsE420DPIasPoaSsRjR8BzZnLxmcfTmq3g%3d Same as used in this board http://macetech.com/store/index.php?main_page=product_info&products_id=22&zenid=a4cf1bba1c70ce4525b6ab130397f969 They have bee...

Re: PCB CNC machine

 by ohararp ¦  Sun Nov 28, 2010 8:27 am ¦  Forum: BatchPCB ¦  Topic: PCB CNC machine ¦  Replies: 76 ¦  Views: 81081

Rolmix, here's my take on things now tha I have access to an S62 at our research labs. 1. S62 is pretty much useless without the fiducial recognition system. You'll want this option to get your vias to line up properly. 2. Vacuum table is also a must have. Very inconsistent results without this. 3. ...

Re: Recommend a solder paste?

 by ohararp ¦  Sat Nov 20, 2010 9:11 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Recommend a solder paste? ¦  Replies: 6 ¦  Views: 1012

Stanley will ship via another method other than overnight. I just double checked this and shipping via UPS ground was $6.45 to my door.

Re: PCB solder paste stencil, board & stencil holder, put stenci

 by ohararp ¦  Sat Nov 20, 2010 9:09 pm ¦  Forum: PCB Design Questions ¦  Topic: PCB solder paste stencil, board & stencil holder, put stenci ¦  Replies: 1 ¦  Views: 726

I think you'd be better off trying to get the makerbot to place the solderpaste directly. That would be a good hack for sure!

Re: Recommend a solder paste?

 by ohararp ¦  Wed Nov 17, 2010 7:54 am ¦  Forum: SparkFun Product Questions ¦  Topic: Recommend a solder paste? ¦  Replies: 6 ¦  Views: 1012

Re: GPS and SMS

 by ohararp ¦  Tue Oct 19, 2010 8:00 am ¦  Forum: GPS ¦  Topic: GPS and SMS ¦  Replies: 4 ¦  Views: 1213

This could be a good start. http://ohararp.com/blog look for Twitter Tracker.

Re: How low can you go?

 by ohararp ¦  Wed Oct 06, 2010 9:13 am ¦  Forum: PCB Design Questions ¦  Topic: How low can you go? ¦  Replies: 11 ¦  Views: 1666

I have access to an lpkf router and although the ability to auto drill precisely is nice, it is still not a replacement for real prototype boards from a pcb house. Plated thru holes is the defining point there. I agree macegr on this point. Vickr also has good points on lead free. Unless I have an a...

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