DIY analog tape delay machine

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From the Make: Flickr Pool:

V2 of my Tape Delay Machine uses two walkman type tape players. One is a Realistic Stereo Mate and the other is a Memorex XB.

Both players have a similar footprint, so I arranged them side by side and connected them together.

A single tape loop runs through two modified cassettes (each which have had one of their left or right sides removed).

The players themselves have had there walls (the two in the center, respectively) filed down, so the tape runs fluently.

The Realistic Stereo Mate has recording capability, where as the memorex does not.

This is purposeful, because the tape (which moves counter-clockwise) travels through the left player (Realistic) where it’s internal microphone records sound, and then travels to the Memorex which plays back the sound about 3 seconds later.

Walkman Analog Delay

Remember before you forget, but no sooner.

There’s a fascinating article by Gary Wolf in this month’s Wired titled “Want to Remember Everything You’ll Ever Learn? Surrender to This Algorithm” about using software to help optimize an individuals memorization process.

We’re all familiar with the notion that memorizing facts takes persistence, time and repetition. What isn’t so obvious is that there’s an optimum time to practice the recollection of facts you are trying to learn, and that time is precisely before you are about to forget that fact:

Practice too soon and you waste your time. Practice too late and you’ve forgotten the material and have to relearn it. The right time to practice is just at the moment you’re about to forget. Unfortunately, this moment is different for every person and each bit of information.

Fortunately, human forgetting follows a pattern. We forget exponentially.

Wolf’s article primarily discusses Piotr Wozniak’s SuperMemo software, an application which is designed to take advantage of this insight. You fill it with a database of things you’d like to remember, and it attempts to model your retention curve for each of the facts while you use it, prompting you to recall information at just the right time to optimally burn it into memory.

Unfortunately, I couldn’t track down an open source tool that does anything similar. Some of the legacy versions of SuperMemo appear to be freeware, and the full application itself isn’t expensive, but I can’t help but think this would make for a really cool open source package.

Software aside, I wonder how effective a person could become at general studying and fact retention by taking this insight into consideration. Are any readers actively using this tool or something similar? I’d love to hear your comments.

Soft Circuit Embroidery demo at Maker Faire

I’ll be doing a demo at 11am on Saturday at Maker Faire on embroidering a circuit with conductive thread, LEDs, and a watch battery. Don’t worry if you’ve never picked up a needle and thread before; this beginner’s level demo will show you the basics of embroidery and circuits. I’m very excited to see you all there!

Make Projects: DIY Blimp

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Everyone likes toys that fly. Unfortunately, most R/C planes are hard to control for people without any experience. Why not make an easy to fly blimp? It’s really quick to make, and many people have at least one of the R/C helicopters used in the build. Even if you had to buy (2) helicopters your cost would be less than $60. Best of all, it is completely non-destructive and can be reversed in a few seconds. So if you have kids, are a kid, or just act like a kid, give this a try. You will love it.

What you need:

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(2) R/C Helicopters (similar to Airhogs)
(2) 24″ long balsa dowels
A little tape
Binder clips or coins for ballastAbout the Build

This project does not require any tools and very few parts to make. In fact, the hardest part about making the Blimp is finding the right balloon. Fortunately, any large balloon will do. I just happened to find a Bratz balloon, but I imagine there are a lot of different Mylar balloons that will work. Make sure it is one of the larger types of balloons so it will support the helicopters.

Step 1: Find the center of gravity

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The first thing you need to do is find the center of gravity. Turn the balloon sideways and pinch the seam in what appears to be the center of the balloon. Next, see how the balloon floats. Is it level? If not, adjust where you are holding until it is floating more or less level. Add a piece of tape or make a mark it at this location. This is where the (2) balsa dowels will attach in a step 3.

Step 2: Build the helicopter support

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Use (2) pieces of 24″ long balsa wood dowels to build the support. First, mark the center of each dowel. Next, tape the helicopters to the ends of the dowels.

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One balsa dowel attaches under the helicopters fuselage behind the little wings. The other dowel attaches to the windshield. This will allow the helicopters to tilt slightly forward when attached to the balloon.

Step 3: Attach the helicopter structure

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This step is a bit tricky to do by yourself. First, place the balloon, upside down, between your legs. Next, use (2) pieces of tape to attach the dowels to the Mylar balloon at the center of gravity. You should have marked this location in step 1. That’s it.

Step 4: Add weight as needed

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Use the binder clips, or some tape and a few coins, to give the balloon a little negative balance. The balloon should slowly float to the floor when you let go. You can add more or less weight depending on how you want it to fly.

Step 5: Charge and fly

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Charge the helicopters batteries, it only takes 10 minutes! Now you are all ready to take your new blimp for it’s maiden voyage. Place both remotes side-by-side and steer it like a tank. It flies great and it’s really fast!

I hope you liked this project. If you make your own R/C Blimp send us a link to pictures, or a video. We love to see what our readers make. Thanks!

Home Chemistry at Maker Faire

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We’re very excited about the release of the second in our line of DIY Science books, Illustrated Guide to Home Chemistry Experiments, by Robert Bruce Thompson. Bob also authored the first title in the series Illustrated Guide to Astronomical Wonders. At Maker Faire, he will be doing demos of lab experiments from the book on Saturday (1pm – 1:45pm) and Sunday (3pm – 3:45pm) at the MAKE Demo stage in the Maker Shed.

From the Maker Store:
Illustrated Guide to Home Chemistry Experiments
Our Price: $34.99

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For students, DIY hobbyists, and science buffs, who can no longer get real chemistry sets, this one-of-a-kind guide explains how to set up and use a home chemistry lab, with step-by-step instructions for conducting experiments in basic chemistry. Learn how to smelt copper, purify alcohol, synthesize rayon, test for drugs and poisons, and much more. The book includes lessons on how to equip your home chemistry lab, master laboratory skills, and work safely in your lab, along with 17 hands-on chapters that include multiple laboratory sessions.

 Images Makerfaire Logos Makerfaire

Maker Faire is a two-day, family-friendly event that celebrates the Do-It-Yourself (DIY) mindset May 3rd and 4th at the San Mateo Fairgrounds, CA (Upcoming.org). It’s for creative, resourceful people of all ages and backgrounds who like to tinker and love to make things. Buy tickets now and save, discount ticket sales end on April 25th, 2008.

If you’re in the Bay Area, or plan to attend Maker Faire add “makerfaire” to your Twitter, we’ll be giving away tickets and will have updates before and during Maker Faire!

Maker Faire Map & Schedule

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Maker Faire is just days away! Now is the time to familiarize yourself with the layout of the San Mateo Fairgrounds. You may also want check out the schedule of events so you don’t miss anything. Then again, you might be the type to just wander around and see what happens. Either way, it’s going to be a great!

Maker Faire is a two-day, family-friendly event that celebrates the Do-It-Yourself (DIY) mindset. It’s for creative, resourceful people of all ages and backgrounds who like to tinker and love to make things.

Tickets Available Now
Buy tickets online now!

Tickets are also available at discounted prices ($5 off per ticket) through May 2nd, 2008 at:
Cartoon Art Museum
655 Mission Street
San Francisco, CA
http://cartoonart.org/

Learn more about Maker Faire 2008