Use the CD-ROM to play mucis in a car!! need a little help!!

[vch...@sfsu.edu]

Use the CD-ROM to play mucis in a car!! need a little help!!
Maybe this is not a new discover, I suddenly have the idea and try it.

I have a few 2x cd-rom at home and who care to waste it if i have to.
I use one old computer power supply and only connect to a cd-rom ( the
kind with play, stop , ear-phone jack and volumn) , and connect to a
speaker. It works, as soon as I put a CD in it and hit the play, the
music play. Oh, this is just for fun, since old computer stuff who
really use them.
If anyone knows about the 4 power line behind the CD-rom and if some
can think about how to connect the cd-rom in a car? Then people,
people have old cd-rom and a car with no CD player, they have make a
cd player out of a cd-rom in the car now.

[Jose A.]

Hi, vcheung

 

So you want to play CD's in your car. Interenting idea.

 

> I have a few 2x cd-rom at home and who care to waste it

Music CD's play at 1x speed, so the ones you've got should work fine.

The 4 power lines behind the CD-rom are this way. I hope you see this graph the same way I see it:

 ,------------------,   <-- 45deg corners

 | *   *    *    *  |

 +------------------+   <-- 90deg corners

  +5v  GND  GND +12v

 

Now, to connect it in your car, you shold think first in a good power supply

> I use one old computer power supply

That won't work in a car, since you don't have 220v or 127v AC voltage. I'd suggest you a quick-and-dirty interface to the 12 volt car battery: This should work fine.

 

                               ,-----------------------* +12

              1 +---------+ 3  |   1 +---------+ 3

12v  *---+------| LM 7812 |----*-----| LM 7805 |--+----* +5

positive |      +---------+    |     +---------+  |

        --- +        |2       --- +       |2     --- +

        --- 1000uF   |        --- 10uF    |      --- 10uF

         |  25v      |         |  25v     |       |

car  *---+-----------+---------+----------+-------+----* GND

ground

      <--- CAR battery      CDROM drive power connector --->

 

I hope you see the above schematic the same way I see it now. It's really difficult to represent a schematic using plain ASCII.

 

You cannot connect the 12v battery directly to the CDrom, since the batt has a voltage between 13 and 15 volts when the engine is running and that could damage the CD drive. Anyways, the 5volt are still needed, so using this circuit you'll get both the 12v and the 5v.

 

About the sonud, either if you connect the speakers to the ear-phone jack or to the rear pannel connector (marked RGGL - right, ground, ground, left), you'll hear the sound but I don't think it will be loud enough. You could use the existing (I suppose) car-radio amplifier and the car speakers you'll have installed, but this is more difficult to explain and you have to reach the insides of the radio and manipulate a couple of things.

 

Good luck!

 

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