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CD-ROM
Drive as Digital-audio CD-Player
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| ACD-ROM
drive can be used as a stand-alone unit for playing digi-
tal audio CDs without interfacing with a computer. The
stereo output of CD player available at the audio jack
can be amplified using audio input facility which is normally
available on a tape deck/tape recorder or a stereo amplifier.
Audio socket on front/rear of the CD-ROM drive is capable
of driving headphones or speakers of less than 500 mW.
Proper stereo jacks for interconnection between CD-ROM
drive and tape deck are available from computer/tape recorder
spares vendors. The principle of operation is illustrated
here with the help of block diagram. The 4-pin power supply
socket available at the rear of a CD-ROM player is meant
for +5V, ground (two middle pins) and +12V inputs. The
power supply can be easily derived using a conventional
power supply circuit as shown in the figure. If you have
an external CD-ROM drive, it can be simply plugged into
the mains since it has self-contained power supply circuit
inside. While there may be minor differences amongst the
available CD-ROM drives’ external controls, a typical
drive’s controls are shown in the figure on top. Please
ensure that a proper power supply connector available
from computer spare parts vendor is used for connection
to CD-ROM drive. To identify +5V and +12V pins on the
drive connector, please note that in the computer +12V
is routed using a yellow wire and for +5V a red wire is
used, while for ground black wires are used with the supply
connector. Once the power supply has been connected correctly,
you will notice that LED indicator on the drive starts
flashing. Now the digital audio CD can be loaded after
pushing the eject button. A second push of the same button
causes retraction of CD carriage into the drive. One can
change the track (song) on the CD using play switch on
the CD-ROM drive. |
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