Category Archives: Engineering

Art lamp and JellyBean: Separated at birth?

Twins

We made– and sold (!)– this art lamp a couple of years ago. It’s a life-sized hollow glass head glued to an aluminum base. Inside the head are two long, tangled, strands of multicolored christmas lights, each with a bimetallic “blinky” bulb. The two halves switch on and off quite irregularly in an animated effect that seems much more complex than the simple electronics should have produced. The end effect is a bit like neurons firing, or perhaps like the brain from a cheesy tv robot.

In this photo, JellyBean is sitting on the top of the bookcase with the lamp and is doing her best to blend in with the surroundings– cats are good at that.
See more pictures of the Evil Mad Scientist Laboratories Feline Auxiliary here.

Vintage Remote TV-B-Gone Case Mod

TVBGone - 1

Turn off that television in classic style!

Here we show you how to hack a TV-B-Gone into the case of a vintage television remote control, such that the original on/off button instead activates the TV-B-Gone. We also modify the power supply so that it runs off of a regular 9 V battery, instead of a set of lithium coin cells.
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Halloween project round-up

Headless horseman

Woo-hoo! We won the grand prize in the MAKE & CRAFT Halloween contest for our set of halloween projects!

    Just in case you missed them, here they are:

Apparently the world was ready for the invasion of Cylon Jack-o-lanterns— They made it onto TV, into magazines, and presumably onto a lot of front porches as well. Lots of people made their own and we’ve rounded up a list of some of the Cylon pumpkins (and umbrella-bat costumes) that we spotted this year. Read on to see where they showed up!
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Easy Itty-Bitty Blinky LED Jack-O’-Lantern

Halloween is tomorrow! Do you want to bring a carved pumpkin to work, but aren’t allowed to burn candles in your cubicle? Do you want to carve a mini-pumpkin that’s simply too small for a candle?

Or are you just running late and need to make a procrastinator’s pumpkin?

If you said yes to any of these questions, we just might have the solution that you’re looking for. Here’s an easy way to make a tiny blinking-LED jack-o’-lantern.

The blinking LED circuit is borrowed from a Tirefly, a commonly available type of motion-sensitive light that attaches to the valve stem on the wheel of a bike or car. Our quick modification (less than five minutes and no soldering) defeats the motion sensor so that the LED can blink all day (or all night) for you. (For hardened geeks who want to solder something anyway, we’ll also show you how to mod the circuit to use a higher-capacity battery.)

[Update: (10/2008) A reader wrote in that they have had trouble getting the circuit to blink continuously; the tirefly circuit may have been changed. (Confirmed– It has changed!) Do any other readers have recent success or failure to report?]
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Building a Robotic Dalek Pumpkin

EXTERMINATE!!! EXTERMINATE!!! EXTERMINATE!!!

We Evil Mad Scientists like Halloween. A lot.

You might have already seen our old-school Cylon Jack-o-lantern. Here is another halloween electronics project, hopefully in time for you to make your own: It’s a radio-controlled robotic Dalek that can move around and turn its head. Oh, and did I mention that it’s a pumpkin?
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Make A Cylon Jack-O-Lantern

It’s a pumpkin! It’s a Jack-o-lantern! It’s an electronics project! It’s… a Cylon!

Cylons are great. They’re evil, menacing, and shiny. They have glowing red lights, computer-monotone voices, and they aim as precisely as imperial stormtroopers.

For halloween this year, we made Cylon Jack-o-lanterns in both large and small versions.

The design consists of two parts, a pumpkin-carving part and an electronics part. The big idea, of course, is to make the Cylon’s red eye scan back and forth.

How well does it work? Take a look! (Youtube)

This week’s Weekend Projects Podcast at Make Magazine is about making a programmable LED pumkin.

Our Cylon is made with a very different approach. It runs on a 9V battery and uses two cheap integrated circuits (a 555 and 4017) that together control six LEDs (or six groups of LEDs).

Circuits like this are quick, easy, and cheap to build. It’s also fun merely from the standpoint of making something that people might expect to require a microcontroller. For this particular circuit, it turns out to be cheaper and faster to do it without one.

If you’re handy with a soldering iron, you can build this circuit for less than ten dollars, in less than two hours, without any programming at all.
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How to make hard drive PCB picture frames


So, you’ve disassembled hard drives, taken the magnets out, made wind chimes out of the platters, and so on. One thing that you might have left over is a set of printed circuit boards. Funny shaped printed circuit boards, with holes in them. Here’s how to turn those leftover PCBs into fabulous geek-chic picture frames.
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Building an Electric Motor


What is a good science project and turns really fast? An electric motor! I built an electric motor for my school science project in third grade. It was fun to build and got a lot of attention at the school’s science fair.

I was looking in a book for a science project idea when I saw instructions for building an electric motor. My parents approved the idea, so Windell and I went looking for parts.
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Supercapacitor Contest: We Have Winners!

We had a lot of fantastic entries in our supercapacitor contest! We now have a Grand Prize winner, two Second Prize winners, and a number of honorable mentions. A big thank you to everyone that submitted entries!

The Grand Prize (ten supercapacitors) goes to Stephen Kupiec, for his winning entry, “Supercap Project Luxeon V Throwie”:

A Luxeon V LED driven off of a LuxDrives 3021 buckpuck has been sporadically putting out a very short bright flash every 15-30 min on my desk startling coworkers. But it hasn’t been connected to power in over a month. The buckpuck has been harvesting power from 220 microfarad electrolytic capacitor which is in the circuit as a power line conditioner. Given a 1 farad supercap coupled with a very low (10000:1) duty cycle flasher circuit, a very distracting flasher could be made.

We selected this entry both for its originality, as well as for taking advantage of the low internal resistance of the supercaps.

Two second prize winners will get five caps each:

Chad Norman‘s entry is funny enough that it’s hard to read with a straight face:

Dress them up, adding little tiny bits of plasticine/playdough and dress them all up real purdy like. Then, using stop motion techniques, animate an epic saga of romance, death, intrigue and action with the supercapacitors as the actors.

From Mike Saz comes another very practical idea for using supercaps:

Mod your wireless mouse. They’ll soak up a day’s worth of juice in seconds, and you can stop buying AA’s, or worse, nicads.

Read on for the (long) list of honorable mentions!
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Supercapacitor Contest: The End Is Near.

The Supercapacitor Contest ends at midnight on Monday night, July 31. The end is near! This is not eBay; there is no advantage in waiting until the last minute. It’s your last chance to submit an entry and possibly win fame and/or fortune, in the form of ten sweet supercapacitors. To recap: submit your best idea for what to do with a bunch of 2.5 V, 1.5 F carbon aerogel capacitors with ultra low equivalent series resistance. To enter, leave your entry as a comment here or E-mail it to us. Keep reading to see some of the cool ideas that we’ve already received. Can you do better?
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