257173091-make-175-kits.pdf

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SPECIAL ISSUE:
ULTIMATE KIT GUIDE
$
9.99
LOCAL MOTORS:
(NOT CHEAP)
BUILD THIS CAR!
MUSIC •
TOYS
• ROCKETS •
FOOD
• HOME
TOOLS
• OUTDOORS •
ROBOTS
• LEDS
SIEGE WEAPONS
• ARDUINO
AND MORE!
3D PRINTER!
BUILD YOUR OWN
$9.99
DISPLAY UNTIL FEB. 15, 2012
PLUS: How Kits
Drive Innovation
kits.makezine.com
a celebration of amazing creations
and the parts that made them possible
.
In a simple coil-oscillator circuit, the frequency
of the oscillations depends on the coil’s size
and how many turns it has. More turns make
current in the coil slower to reverse, lowering
the frequency. Moving metal objects close to
the coil also lowers the frequency, because it
adds more electrons sloshing back and forth
in the coil’s constantly reversing magnetic field.
So a coil circuit will change its frequency in close
proximity to metal, but the change is usually too
small to hear. To make it more obvious, a second
oscillator circuit with a manually tunable coil can
act as a reference oscillator. Tune the reference
to match the detector. Very slight changes in the
detector frequency will result in an easily heard beat
frequency, as the two tones cyclically reinforce and
cancel each other out. (The beat frequency equals
the difference between the two frequencies.)
Connect headphones or a speaker, add a handle
for moving the detector over the ground, and you’re
ready to hit the beach in search of treasure.
To make your own treasure finder, you need plywood,
a broom handle, some electronic components and
a few other easily sourced parts.
By Paul Spinrad & Steve Hobley
See how it’s made at:
RadioShackDIY.com/TreasureFinder.
Transistor
Capacitors 0.01µF
SPST
Toggle Switch
9V Battery
Snap connector
for 9V Battery
22-Gauge Hookup Wire
To submit your own creation, explore
other great creations and get the
hard-to-find parts you need, visit
RadioShack.com/DIY
SCAN THIS QR CODE TO LEARN MORE
ABOUT THIS PROJECT
welcome
Why Are We Crazy
for Kits?
By Keith hammond
This special issue of MAKE is all
about kits, and the promise behind
each kit that you can make some-
thing cool. Why?
Kits are the gateway DIY project.
Words can’t describe the pride
a 9-year-old feels when he glues
the final piece atop the enormous
Apollo Saturn V moon rocket model
he built with his dad (Thanks, Dad!)
and takes it to show-and-tell at
school.
I made this!
For many of us, a kit is the first
thing we remember making —
whether Lego or Erector sets (see
page 18), needlepoint or paint-by-
number, or model planes and cars
from Testors and Revell. The excite-
ment can be enough to set us on a
path of creative making for life. Who
knows what doors you’re opening
when you put a kit in the hands of a
beginner?
Kits teach skills.
When you
make a kit, somebody has done you
a great service — designed it, gath-
ered parts, illustrated instructions —
so you can focus on the good stuff:
mastering the skills required to
make the thing, and understanding
how it works.
Handmade beats store-bought.
Pink Snuggie blankets come and go,
but Grandma’s crocheted afghan is
forever. Psychologists call this the
Ikea Effect — adding our personal
labor just makes the thing more
valuable.
Making something is more fun
than buying it. Kits quick-start the fun.
2
Make:
kits.makezine.com
Kits are exciting and myste-
rious.
If you don’t know how to
make it from scratch, then the kit
is your path into the unknown, to
new knowledge that’s empowering,
maybe even dangerous (just ask
Wile E. Coyote about ACME kits).
Like Alice’s “Drink Me” bottle or
Neo’s red pill, the kit is a portal to an
experience you may or may not be
ready for. And if it’s mysterious to
you, imagine how deliciously mys-
tifying it must be to those around
you.
What is he building in there?
Kits are great for sharing.
Kids
and parents can build a starter kit
on an equally clueless footing, learn-
ing together.
Kits open up community.
Build
a kit and you’re joining a group of
people who’ve built it too, and are
no doubt trading tips and showing
off their builds online. You’re smart-
er thanks to the pack, and you’re
meeting makers who share your
excitement.
Kits drive innovation.
When
a kit sells well, suddenly there
are people in every town building
newfangled TV sets (remember
Heathkit? they’re back, see page 24)
or aerial Arduino robots (check out
DIY Drones, page 26). Like seeds in
the wind, those kits switch on thou-
sands of new makers, who become
a community of innovators, excited
and hungry for more advanced kits
and products, in an upward spiral.
MIT’s Michael Schrage looks into
the phenomenon (page 8) and finds
that kit-makers have driven the
great technology upheavals, from
Boulton & Watt’s steam kits in the
Industrial Revolution, to Woz and
Jobs’ Apple I kits in the computer
revolution (build a replica, page 41).
I remember my dad’s excitement
building kit computers in the 1970s,
little boxes programmed in hex
code via a 10-key pad, no video, just
7-segment red LEDs for a readout.
A kit in the mail challenged him to
build his skills, raised his expecta-
tions of computers, and fired his
imagination about what could be
done with them. Once he’d mas-
tered a kit, he wanted the next most
advanced kit, and then the first
home computers (Apples, Ataris,
Commodores), and so on.
Multiply that fired-up kit maker by
thousands and you’ve got a smart,
skilled, hungry community experi-
menting with new technology, and
bringing along their friends (and
their kids — my sibs and I were 10,
11, and 13, programming in BASIC).
History repeats.
Today we’re
watching the same innovation explo-
sion unfold in 3D printing, DIY robot-
ics, and microcontrollers, as skilled
amateurs build kits and hack them,
egg each other on, and teach those
around them.
The next Steve Jobs is out there,
building kits.
Keith Hammond is Projects Editor of MAKE. He
wanted to be an astronaut.
Tough,
yet
versatile.
As durable as it is beautiful, Corning® Gorilla® Glass makes your
sleek designs tough enough for real-world mobility. It already
helps protect millions of the world’s coolest smartphones and
tablets from the scratches, drops, and bumps of everyday use.
Where will it go next?
Start innovating at CorningGorillaGlass.com
©2011 Corning Incorporated. All rights reserved.

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