Archive for the ‘Internet’ Category

Partsim: Circuit Simulation Made Easy

June 17, 2013 1 comment

I came across Partsim, a free and easy to use circuit simulator that runs in the web browser, and would definitely encourage you to check it out if you’re looking for a tool to design and simulate circuits.

partsim snip


It supports a wide variety of components, and even supports Digi-Key integration to make it easy to buy your project once you’ve seen its results. That’s a great feature! Anything to take some of the pain out of generating a Bill of Materials is welcome in my book.

Check it out! Partsim

Listen to Ham Radio Online with the ETGD WebSDR

June 1, 2013 1 comment

I just discovered the fascinating Wide-band WebSDR operated by the amateur radio club ETGD at the University of Twente in the Netherlands.

websdr board

PA3FWM built a fascinating wideband SDR using a Xilinx FPGA, high-speed ADC and gigabit Ethernet interface to receive most of the entire shortwave and amateur radio bands at once and allow tuning and processing in software via an HTML5 or Java web browser.

websdr capture

I’m listening to a station on 9760 kHz right now, which is broadcasting what sounds like classical choral hymns and dialog in Italian and Latin, so it could be a Vatican shortwave broadcast station. The interface is easy to use, and right now 142 users are tuning in from around the world.

It’s definitely worth checking out. I like shortwave listening but even with a great converter and my RTLSDR, my location just isn’t optimal for receiving the kind of signals I’m interested in – this web option is a lot of fun to go exploring.

Odd Web Site Behavior

April 16, 2013 Leave a comment

I’m moving towards hosting the majority of my content on an on-premises server, versus the mix of hosted services I’m using currently. I’ve been running into some issues, though, that maybe one of you who is reading could help with…

The issue appears to be: some users, for no particular reason I’m able to identify, are unable to access any of my web sites.

My web domains are pointed at my server’s public, static IP address. The DNS records are valid, and DNS resolution works as expected always returning the correct address. The server responds to ping, and can complete a trace route. But, for users who this problem effects, it’s as if the server doesn’t respond. From my mobile device, for instance, I receive an Error 504 Gateway Timeout, the cell phone network’s caching proxy can’t receive data from my server. Port scanning reveals the ports are open and accepting connections on the server, but bonnection requests time out with no received data from a system on a Time Warner connection, as well.

This is all occurring while other users are logged in and actively using some services, so it seems unlikely to be an issue with the server itself failing. Even more vexingly, it’s intermittent. My mobile web site was working yesterday. It is not working today, from my cell phone.

If anyone has troubleshooting suggestions, I’d love to hear them.


Categories: Commentary, Computers, Internet


October 31, 2012 Leave a comment

Twitter failed. Hard.

July 26, 2012 Leave a comment

So badly, in fact, it looks like their scripting mark-up isn’t even being processed.


Not what I expected to see from such a web giant.

via Boing Boing

Free Mapping and Tracking for Android [My Tracks]

May 29, 2012 Leave a comment

Beautiful weather has finally arrived in the Pacific Northwest and I’ve been taking advantage of it as often as I have time. One thing about living where it’s grey and rainy for so much of the year, it really almost forces me to go outside and be active when it’s nice out. I’ve been riding my bike around, and wanted an easy way to keep track of my stats like speed, distance, which trails I was riding and altitude. Turns out there’s a free and easy way that integrates well with Android: Google My Tracks

My Tracks uses your phone’s GPS to record your position and plots it on a map, where you can upload it to Google Maps or export your track as an industry-standard KML file for analysis in another application.

You get a print out of your statistics at the end, and can optionally insert markers with interval statistics on a custom schedule. The app has been around for a few years but has become much easier to use lately. My last ride was 12.9 miles long at an average moving speed of 7.5 miles per hour:

Total distance: 20.78 km (12.9 mi)
Total time: 2:56:35
Moving time: 1:43:56
Average speed: 7.06 km/h (4.4 mi/h)
Average moving speed: 11.99 km/h (7.5 mi/h)
Max speed: 34.62 km/h (21.5 mi/h)
Average pace: 8.50 min/km (13.7 min/mi)
Average moving pace: 5.00 min/km (8.1 min/mi)
Min pace: 1.73 min/km (2.8 min/mi)
Max elevation: 179 m (589 ft)
Min elevation: 93 m (304 ft)
Elevation gain: 984 m (3228 ft)
Max grade: 12 %
Min grade: -17 %
Recorded: 5/26/2012 12:21 PM

The application also integrates with a Polar brand heart rate monitor over Bluetooth to record heart rate statistics along with the other information. I don’t have that option yet, but plan to add it fairly soon. This is a great free app that everyone should know about. It’s not just useful for mapping a trail, either – you could use it to mark where you left your car, see where you’ve been in an amusement park, or record the location of interesting landmarks you see while wandering around the city. Check it out!

My Tracks

Don’t Let Congress Destroy the Internet

November 16, 2011 Leave a comment

I tend to stay away from political commentary on my blog, but this is too important not to talk about. The PROTECT IP act currently the subject of hearings in Washington, D.C. is set up for a fast-track to pass. Testimony from the technology industry is being prohibited in the committee, so technologists and infrastructure companies aren’t being allowed to have any say in the bill that will effectively set up the “Great Firewall of America” and allow Hollywood to become the ultimate arbiters of what content isn’t allowed to be posted online, backed up by the Department of Homeland Security. Unless the possibility of spending five years in Federal prison because you posted a video of yourself singing a cover of a pop song to YouTube is something you enjoy, it’s time to take action.

Send this form letter, or write your Congressman a personal message. Don’t let the Government, in partnership with the entertainment industry, execute a power grab possibly exceeded only by the PATRIOT act.


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