Search found 153 matches

by Roko
Mon Feb 28, 2011 9:15 am
Forum: PCB Design Questions
Topic: SMT Station -- HotAir or InfraRed?
Replies: 3
Views: 2370

Re: SMT Station -- HotAir or InfraRed?

To answer #3, don't overlook a good old fashioned quality soldering station. You can do many SMT tasks with a regular one. I've been using my Weller WES50 for roughly a decade, including soldering 0.3mm pitch LQFPs, 0402s, occasional 0201s, etc. It takes practice but works. Reflow soldering, however...
by Roko
Sun Feb 20, 2011 3:21 pm
Forum: Wireless/RF
Topic: Very Long Range Non-Line Of Sight
Replies: 9
Views: 1998

Re: Very Long Range Non-Line Of Sight

SATCOM FTW: http://www.digi.com/products/wireless-wired-embedded-solutions/satellite-wifi-cryptographic/satellite-connectivity/m10.jsp#overview Overkill, yes, but so cool. Otherwise, maybe you can investigate lower frequency bands where you can use ground wave propagation. HAM license would probabl...
by Roko
Wed Feb 09, 2011 9:59 am
Forum: SparkFun Product Questions
Topic: High Altitude Balloon Communication
Replies: 26
Views: 2907

Re: High Altitude Balloon Communication

This guy has a video on youtube of APRS being pushed through an FRS radio...
http://www.youtube.com/watch?v=sqv3RZ0kSZ8

Implementation Details here:
http://rev0proto.com/wiki/index.php/Rev0Trac
by Roko
Sun Jan 30, 2011 3:22 pm
Forum: PCB Design Questions
Topic: Vias too close to pads of the same net?
Replies: 3
Views: 705

Re: Vias too close to pads of the same net?

You typically want to avoid having vias too close to pads, since the vias can suck solder away from the pad due to capillary action. Remember that there's a minimum width required to ensure a complete solder-mask. A 0.1mm solder mask width might not be manufacturer with any reliability by your PCB h...
by Roko
Tue Jan 25, 2011 3:40 pm
Forum: BatchPCB
Topic: Can Someone Please Give Me a Link to...
Replies: 2
Views: 966

Re: Can Someone Please Give Me a Link to...

Cadsoft Eagle seems to be one of the more commonly used free PCB suites for hobby use.

gEDA is another one to look at.

Google should be able to provide you with information and links for both.
by Roko
Fri Jan 21, 2011 6:52 pm
Forum: SparkFun Product Questions
Topic: Help on my first project.
Replies: 5
Views: 608

Re: Help on my first project.

Hi ChrisDA If you want to make a circuit board that mounts breakout boards (i.e. if you're not ready to reflow solder a QFN component yourself just yet), you'll need to use headers. Most (if not all) of the sparkfun breakout boards use standard 0.1" spaced headers. On your PCB, you simply need to ha...
by Roko
Wed Jan 19, 2011 4:50 pm
Forum: PCB Design Questions
Topic: Is my FT232 Schematic correct?
Replies: 1
Views: 492

Re: Is my FT232 Schematic correct?

Off the top of my head:

- Reset is permanently pulled low in your schematic, it will never come out of reset
- PWREN is floating, this is used to determine if it's self powered or bus powered...
by Roko
Sat Jan 15, 2011 12:03 pm
Forum: PCB Design Questions
Topic: Small connectors
Replies: 5
Views: 844

Re: Small connectors

Instead of crimping, you could get the IDC version of those 1mm connectors. That's what I use. The caveat there is you need to pay specific attention to the wire guage and insulation diameter. I don't use the tool for the IDC connectors, just a small screwdriver. (I might eventually make something b...
by Roko
Fri Jan 14, 2011 11:34 am
Forum: Sparkfun Promotions and Competitions
Topic: Like last year: time lost, credibility lost. FAIL
Replies: 8
Views: 5051

Re: Like last year: time lost, credibility lost. FAIL

Out of curiosity, which other suppliers are more reliable on their respective "free days"?
by Roko
Thu Jan 13, 2011 9:53 pm
Forum: Sparkfun Promotions and Competitions
Topic: That was kinda fun!
Replies: 5
Views: 3829

Re: That was kinda fun!

Took me 20 minutes to claim my $40 loyalty dollars (I figured I'd try for 30 minutes in the morning before leaving for work). That'll add nicely to the robot fund. Thanks Sparkfun! :) I even managed to get some work done from home while doing it, I'd go through e-mails and just click refresh every c...
by Roko
Thu Jan 13, 2011 9:51 pm
Forum: SparkFun Product Questions
Topic: Ultimate IMU got it as scratch and dent, how do I get this
Replies: 13
Views: 1353

Re: Ultimate IMU got it as scratch and dent, how do I get this

Ah, neat. Maybe just check for power-ground shorts with a multi-meter.. If there are none plug it in and hope for the best :D
by Roko
Thu Jan 13, 2011 1:58 pm
Forum: SparkFun Product Questions
Topic: Ultimate IMU got it as scratch and dent, how do I get this
Replies: 13
Views: 1353

Re: Ultimate IMU got it as scratch and dent, how do I get this

Hehe, it's that tricky second page to the schematic ;)
by Roko
Thu Jan 13, 2011 1:28 pm
Forum: SparkFun Product Questions
Topic: Ultimate IMU got it as scratch and dent, how do I get this
Replies: 13
Views: 1353

Re: Ultimate IMU got it as scratch and dent, how do I get this

Given the proximity to the ADXL345, I'd lean towards it being C15 (1uF on the schematic corresponding to the 1uF labeling on the cap) C3 and C16 look like they're tantalum caps, judging from the product photos. obbi13, are you sure that part is the one causing problems? Try removing it form the PCB ...
by Roko
Wed Jan 12, 2011 4:46 pm
Forum: SparkFun Product Questions
Topic: Ultimate IMU got it as scratch and dent, how do I get this
Replies: 13
Views: 1353

Re: Ultimate IMU got it as scratch and dent, how do I get this

Looks like a 35V 1uF Panasonic FC Series Electrolytic Capacitor:
http://www.panasonic.com/industrial/com ... series.pdf

P/N is in that datasheet.

Oh no, I'm a nerd.