Archive for month: June, 2011

Treasure Trove of Ideas Re: Homebrew CPUS

June 30, 2011 | Homebrew CPU | By: Mark VandeWettering

Dieter Muller has an amazingly interesting collection of interesting ideas about building homebrew cpus with TTL logic. I’m sure to old school logic designers, most of these are old hat, but to the nearly crazed home experimenter, they are quite illuminating. His hints on ALU design are what brought me to the site, so I’m […]

Recordings of High Frequency Beacons…

June 29, 2011 | Amateur Radio | By: Mark VandeWettering

It’s been quite some time since I’ve hunted for any beacons, and I’ve never really payed much attention to HF pirate beacons. Typically these are solar powered beacons which are deployed somewhere in the deserts of the American Southwest, and charge during the day and transmit simple sequences of Morse characters once the sun goes […]

What is your blog’s business plan? Does it really need one?

June 27, 2011 | Blogging, Rants and Raves | By: Mark VandeWettering

It was a convenient time to renew my blog’s hosting plan over the weekend, so I made my payment and you can be assured that the brainwagon blog (which as many as a dozen of you inexplicably read) will be available for another 12 months. It got me thinking about the many bloggers I know […]

Debugging an RFI problem on Field Day…

June 26, 2011 | Amateur Radio | By: Mark VandeWettering

I spent most of the week in New York, so Field Day snuck up on me without me making any serious plans. But since Jeri has been homebrewing her own SDR I’ve been thinking more about that, and thought that I would dust off my SDR-IQ receiver and at least make some recordings of the […]

The Duo Adept, another 8 bit computer built from TTL logic…

June 17, 2011 | Homebrew CPU | By: Mark VandeWettering

In a previous blog post about a year ago, I pointed you at Jack Eisenmann’s 4 bit computer built from TTL chips. It was cool, made entirely on breadboards tucked away inside a big plastic container. Or, I used to think it was cool, until I saw what he’s been up to: an 8 bit […]

Bit banger

June 17, 2011 | Games and Diversions, Link of the Day, Video | By: Mark VandeWettering

Anyone who has seen my projects on the Atari 2600 might reasonably conclude that I have a thing for retro computing. The saying goes “it is no virtue to do with more, what can be done with less” and I can’t think of someone whose projects have embodied that more than demo coder Linus Akesson […]

Andrew Holme’s projects

June 16, 2011 | electronics, Link of the Day | By: Mark VandeWettering

Most of the websites that I link to are related to specific topics or projects. But every once in a while, you find one that has a bunch of good stuff that matches some of your esoteric interests, and you wonder how one person could do it all. Inspired by Jeri Ellsworth’s latest video showing […]

Gyrator circuit in LTSpice…

June 15, 2011 | Amateur Radio | By: Mark VandeWettering

While watching TV (not very closely) I went ahead and entered the “gyrator” part of the Gyrator VLF circuit. It does indeed seem to work. No real analysis, just the circuit as I built it.

The Gyrator VLF receiver…

June 15, 2011 | Amateur Radio, Amateur Science, Astronomy, electronics | By: Mark VandeWettering

Back on June 7, there was a spectacular coronal mass ejection on the sun: Yes, I did mention this event and gave some links to VLF receivers at the time, but I’ve been thinking about this some more. As an astronomy/telescope buff, I have built simple telescopes for looking at the sun, but I haven’t […]

Software Defined Radio Links

June 15, 2011 | Amateur Radio | By: Mark VandeWettering

I own an SDR-IQ software defined radio, a Funcube Dongle (more on that later) and have built a marginally operable Softrock Lite receiver, so you might say I’m interested in Software Defined Radios. But Jeri’s tinkering with her own software defined radio has rekindled my interest in homebrewing one. I was looking for Gerald Youngblood’s […]

A Cree LED in my linear current LED Transmitter

June 15, 2011 | Amateur Radio, electronics | By: Mark VandeWettering

I was away all weekend, so I didn’t get a chance to check out my LEDs that I got from Deal Extreme last week. Tonight, I just soldered a couple of clip leads and tried it out when hooked to the linear current modulator that I built (and blogged about) before. The transmitter in this […]

Screenshot from my latest Gameduino tweaks…

June 12, 2011 | Arduino, Gameduino | By: Mark VandeWettering

I was having some difficulty with doing screenshots using the code that was on the Gameduino website, so I posted a message on asking for help. James came back in just a few hours with fresh code that now works perfectly. For example:

Some more simple test code for the Gameduino

June 11, 2011 | Arduino, Gameduino | By: Mark VandeWettering

Without explanation or screen dump, here’s a little program I hacked together. Update: The syntax highlighter I was using is munging this stuff. So, here’s a link to a zip file containing the code.

Papilio – An Introductory FPGA Kit

June 11, 2011 | FPGA | By: Mark VandeWettering

My own explorations of FPGA have been, well, slow. Well, let’s be truthful: since buying a BASYS-2 board, I have done little more than ensure that it powers up. But I’m still interested in FPGAs, and so I thought I’d draw attention to a board that I saw for the first time at the Maker […]

Gameduino Programming Examples?

June 10, 2011 | Arduino, Gameduino | By: Mark VandeWettering

I am going to be trying to post some code examples and demos using the Gameduino over the next few weeks. I have an idea for a crazy little demo project that I should be able to hack together in a few hours. I’m curious though: who else has got one, and what are you […]