Archive for month: April, 2011

Eldon made a very cool version of the FM micro transmitter

April 30, 2011 | Amateur Radio, electronics | By: Mark VandeWettering

Eldon, WA0UWH was inspired by my recent experiment with Tatsuo Kogawa’s micro transmitter, and decided to build his own. Unlike my rather crude (but surprisingly effective) lashup on some copper clad board, Eldon designed a tiny 0.5″x0.8″ board, etched it and used surface mount components to finish it. Very nifty, and totally dwarfed by the […]

Minor outages might occur…

April 27, 2011 | Amateur Radio | By: Mark VandeWettering

I’m doing a bit of website management. This might result in some minor unavailability of my website: hang in there, I’ll be back. Update: I appear to be up and running again on a new server. Go ahead and send me some send me an email if you note any troubles.

Book Review: Land of LISP, by Conrad Barski

April 26, 2011 | Books I Read, Games and Diversions, Programming Languages | By: Mark VandeWettering

I learned to program as a teenager back in the 1980s, starting as most of a generation of future computer professionals did. I had an Atari 400 at home, and learned to program using the most popular language of the day: BASIC. There were lots of magazines like COMPUTE! and Creative Computing that included program […]

The Micro FM transmitter on copper clad (much better!)

April 19, 2011 | Amateur Radio, electronics, My Projects | By: Mark VandeWettering

Yesterday’s video showed a very fussy version of Tetsuo Kogawa’s 1 transistor FM transmitter, which worked after a fashion, but which seemed really squirrely. Almost any motion of anything caused the circuit to behave rather badly as capacitance changed, and I picked up a considerable amount of hum. Today, I rebuilt the circuit onto a […]

Schematic for the Micro FM transmitter

April 19, 2011 | electronics, My Projects | By: Mark VandeWettering

Tetsuo Kogawa’s circuit is pretty well documented, but not in conventional schematic form. I decided to enter it into LTSpice to see what it could make of it, and decided to go ahead and put the schematic online here, with perhaps a few comments: I’ve set this up more or less as I built the […]

Watermarking and titling with ffmpeg and other open source tools…

April 19, 2011 | Amateur Radio, Computer Graphics, Games and Diversions, My Projects, Video | By: Mark VandeWettering

I’ve received two requests for information about my “video production pipeline”, such as it is. As you can tell by my videos, I am shooting with pretty ugly hardware, in a pretty ugly way, with minimal (read “no”) editing. But I did figure out a pretty nice way to add some watermarks and overlays to […]

The (too simple) Micro FM transmitter on a breadboard

April 18, 2011 | Amateur Radio, electronics | By: Mark VandeWettering

A couple of days ago, I mentioned Tetsuo Kogawa’s MicroFM transmitter, a simple one transistor FM radio transmitter. Tonight, I decided to put it together on an experimenter’s breadboard. I didn’t have the 2SC2001 transistor that Tetsuo Kogawa used, so I just dusted off one of my $.10 2N3904 transistors, and dug the rest of […]

Jesse Jackson Jr.: The iPad Is Killing American Jobs

April 18, 2011 | Quack of the Day, Rants and Raves | By: Mark VandeWettering

I’m going to divert myself from my normally safe topics of conversations, and briefly wander into a matter of politics, because Representative Jesse Jackson Jr. has been getting a lot of press lately for his astonishingly stupid remarks about the iPad costing American jobs. Jesse Jackson Jr.: The iPad Is Killing American Jobs. Sigh. First […]

How to build the simplest transmitter?

April 15, 2011 | electronics | By: Mark VandeWettering

In digging around for small AM radio schematics (I’m more interested in AM than FM), I ran across Tetsuo Kogawa’s site on building the “simplest” FM transmitter. It’s actually pretty cute, and has just a single transistor, a few resistors and caps, and a coil that you can wind yourself on the threads of a […]

Code from the Past: a tiny real time raytracer from 2000

April 12, 2011 | Computer Graphics, My Projects | By: Mark VandeWettering

Back in 2000, I was intrigued by the various demos that I saw which attempted to implement real time raytracing. I wondered just what could be done with the computers I had on hand, without using any real tricks, but just a straightforward implementation of ray/sphere and ray/patch intersection. As I recall, I got two […]

Cool Hack O’ Day: real pixel coding

April 11, 2011 | Computer Graphics, Link of the Day | By: Mark VandeWettering

The problem with working some place with lots of intelligent people is that it is increasingly hard to maintain one’s sense of superiority. Today, I tip my hat to Inigo. He has a very cool demo here, where he creates a program by creating and editing a small image in photoshop, saving it as a […]

Sony drops lawsuit against Geohot, but not really…

April 11, 2011 | Rants and Raves | By: Mark VandeWettering

I was directed to a posting about the lawsuit between Geohot and Sony by a twitter from @adafruit. Sony drops lawsuit against Geohot – a maker, hacker and innovator… « adafruit industries blog. I think the article’s title is rather misleading. Sony didn’t drop the lawsuit: the lawsuit was settled. While Geohot admitted to no […]

Announcing the “Soldering is Easy” Complete Comic Book!

April 11, 2011 | electronics | By: Mark VandeWettering

Like many mechanical skills, soldering may seem fairly daunting if you’ve never done it before, but it’s really not that hard. If you need a basic getting-started guide, you could try out the new Soldering is Easy comic book. I think the only thing it really could use is a better guide to buying a […]

Cool Link on Maze Generation, with Minecraft Application

April 11, 2011 | Games and Diversions, Puzzles | By: Mark VandeWettering

Josh read my earlier article on maze generation, and forwarded me to this cool link via Twitter. It’s an article by Jamis Buck, and details all sorts of cool ways to generate mazes, with examples, applets, discussion… It’s simply great. It even includes an online maze generator for constructing random mazes suitable for construction in […]

Update: Was Hank Aaron really that good?

April 8, 2011 | Baseball | By: Mark VandeWettering

Back in 2007, I was looking at the career total bases expressed as miles, mainly to demonstrate what an outstanding career Hank Aaron had. brainwagon » Blog Archive » Was Hank Aaron really that good? I expressed with certainty that Bonds would never catch (and indeed, nobody may ever catch) Aaron’s numbers for total bases. […]