PLEASE NOTE: This page is under construction
Sony Walkman for diving
Author: Matti Anttila.
Copying etc. prohibited without prior written permission by the author.
Created 26.9.2002., updated 10.11.2006. In case the reader of this page has comments, questions etc, I'm happy to receive them
by e-mail matti at antti dot la.
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The idea
Simply said: It's frustrating to wait in the loooo-oong decompression stops and having _nothing_ to do.
You can take juice and drink it through a straw, then you can have laminated journals etc. But music! That's just great!
And why not have a loudspeaker, so everyone else in the decompression stop can (have to..) listen to the same music
than you do! :)
Prototype
First test, year 2002:
Plain box, equipped with O-ring sealing. There was obviously nothing inside, because the idea was to test
the implosion point of the empty box. Two tests were made. First box broke in a depth of 8,6 m (29 feet), second one
broke in 8,9 m (30 feet).
Second test, year 2002:
Same as above (Test 1), but this time the box included structural reinforcements, Sony Walkman and a separate amplifier with
a loudspeaker. Approximated audio output was 3W.
Image 1
The box before immersion.
Photo: Matti Anttila
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Image 2
Magnetic switch, first version.
Photo: Matti Anttila
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Image 3
Loudspeaker
Photo: Matti Anttila
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Image 4
Loudspeaker
Photo: Matti Anttila
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Image 5
Photo: Matti Anttila
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Image 6
Photo: Matti Anttila
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Image 7
Photo: Matti Anttila
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Image 8
Photo: Matti Anttila
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Image 9
Photo: Matti Anttila
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Image 10
Photo: Matti Anttila
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Second prototype
Immersion test, November 2006:
The amplifier/loudspeeker gave now about 6W audio out. Once again I have the same, lousy crap music from
local radio station recorded to a C-cassette. The player was already ON with automatic tape-reverse, and only
the power circuit was off.
Maximum depth 7.0 meters (~23 feet), temperature 6°C in that depth, outside temperature -2°C.
At first, the box seemed to perform well in structural sense, but soon after 2..3m depth the inner wall of the
box started to show some moisture. The music was hardly hearable, unless you kept the device right next to your
ear. After 5 minutes, the leaked water had shut down the amplifier circuit, and only the Sony Walkman kept
going and you could hear the cassette playing (the DC motor humming).
Results
- 10 minutes
- 7 meters
- leaked
- short-circuitted amplifier
- but the box did structurally well
The results were disappointing, as expected.. ;)
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Copyright, Matti Anttila
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