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Using a Dell DJ MP3 player for field playback of bird songs. Rev A2, November, 2005
© Copyright Stuart Healy www.aztrogon.com Page 4 of 25
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HARDWARE
The Dell DJ 30 is a very compact and sleek unit that measures approximately 4 x 2.4 x 0.7 inches and
weighs 6.4 ounces. I use it with an optional soft carrying case which increases the weight to 7.6 ounces.
For output, I use a Radio Shack mini speaker-amplifier (catalog #277-1008C). The speaker-amp measures
3.5 x 2.75 x 1.4 (base), 1.2 (top) inches and weighs 5.4 ounces when equipped with a rechargeable 9 volt
battery (weight includes modifications). I use a 6’ cord with 1/8 inch miniplugs to connect the units.
Unlike some MP3 players that use four compass point buttons to
navigate through the various on-screen menus, most operations with
the DJ are done using the centrally located “scroll-select” dial. This
slightly ribbed wheel can easily be rolled up and down using a t
and pressed to activate the currently highlighted selection
The main menu can always be reached quickly from anywhere in the
menu system by pressing the “home” button to the right of the s
select dial. From there I can get to any bird very quickly.
The power button on top of the unit must be depressed for 2 seconds
to prevent accidental operation; a slide switch locks out buttons.
Complete information about controls and operation can be found in
the DJ 30 user’s guide (see appendix).
The DJ supports selection
of music tracks by Genre,
Album, Artist and P
See the implement
section on how I use these
features.
The back of the speaker-
amplifier is secured by a
screw which I removed and
replaced with a Velcro
strap to facilitate easy field
replacement of the battery.
I also added a push button
for easy on/off control.