Search found 307 matches

by ohararp
Thu Jun 30, 2011 7:25 am
Forum: New Product Ideas
Topic: Micro-Blower
Replies: 5
Views: 5730

Re: Micro-Blower

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.
by ohararp
Sun Mar 13, 2011 11:16 pm
Forum: PCB Design Questions
Topic: Solder Paste Selection
Replies: 7
Views: 1373

Re: Solder Paste Selection

I prefer Stanley for Solder Paste, 35 gram jar is half the price here vs digikey - http://www.stanleysupplyservices.com/pr ... pn=143-782
by ohararp
Tue Mar 08, 2011 7:17 am
Forum: PCB Design Questions
Topic: Scorching on PCBs with no solder mask
Replies: 4
Views: 1360

Re: Scorching on PCBs with no solder mask

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.
by ohararp
Mon Feb 28, 2011 8:49 pm
Forum: PCB Design Questions
Topic: SMT Station -- HotAir or InfraRed?
Replies: 3
Views: 2414

Re: SMT Station -- HotAir or InfraRed?

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.
by ohararp
Mon Feb 07, 2011 8:14 am
Forum: GPS
Topic: Vehicle Tracking
Replies: 12
Views: 2200

Re: Vehicle Tracking

Would something like this work for you? - http://ohararp.com/wp/?p=119
by ohararp
Sun Feb 06, 2011 9:29 pm
Forum: SparkFun Product Questions
Topic: temperature sensor
Replies: 34
Views: 3743

Re: temperature sensor

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
by ohararp
Sat Dec 11, 2010 10:17 pm
Forum: SparkFun Product Questions
Topic: Calling all LED nuts
Replies: 9
Views: 986

Re: Calling all LED nuts

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.
by ohararp
Sat Dec 11, 2010 3:17 pm
Forum: Arduino
Topic: 10x16 RGB array -- Open Source HW&SW
Replies: 3
Views: 986

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

Justin, can you confirm the source code is programmed in the Arduino ide? If not, what compiler is used?
by ohararp
Sat Dec 11, 2010 9:44 am
Forum: SparkFun Product Questions
Topic: Calling all LED nuts
Replies: 9
Views: 986

Re: Calling all LED nuts

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...
by ohararp
Sun Nov 28, 2010 8:27 am
Forum: BatchPCB
Topic: PCB CNC machine
Replies: 76
Views: 79879

Re: PCB CNC machine

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. ...
by ohararp
Sat Nov 20, 2010 9:11 pm
Forum: SparkFun Product Questions
Topic: Recommend a solder paste?
Replies: 6
Views: 976

Re: Recommend a solder paste?

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.
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: 715

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

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!
by ohararp
Tue Oct 19, 2010 8:00 am
Forum: GPS
Topic: GPS and SMS
Replies: 4
Views: 1201

Re: GPS and SMS

This could be a good start. http://ohararp.com/blog look for Twitter Tracker.
by ohararp
Wed Oct 06, 2010 9:13 am
Forum: PCB Design Questions
Topic: How low can you go?
Replies: 11
Views: 1596

Re: How low can you go?

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...