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    [moved] How to Connect CD ROM Drive with Adapter externally !

    I am trying to connect my CD ROM with 12V and 5V adapter or just 19V Adapter. The cdrom drive power is connected with 4 pin molex connector . I tried connecting the 12V and 5V adapter to the power source....but nothing happens....

    Can this work...or which wire should be connected to the right pin...

    direct 19V is advisable ?

    Please assist....thanks

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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    If using prewired Molex then 12v and 5V is correct.

    19V will burn out some components.
    go to BIOS to check CDROM is present and jumpered correctly on drive if using ribbon cable.
    A best design is easily achieved with good test specs™
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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    Quote Originally Posted by SunnySkyguy View Post
    If using prewired Molex then 12v and 5V is correct.

    19V will burn out some components.
    go to BIOS to check CDROM is present and jumpered correctly on drive if using ribbon cable.
    @sunnyskyguy- thanks...I mean i am using as a standalone CD Drive without pc....tried connecting the adapter...but not able to get it...yellow with 12V....red with 5V...how to give the ground connection...the molex connector has six wire...



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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    Molex is a connector company that make 10k different connectors.

    But when consumers say Molex conn. they usually mean the 4 pin conn type inside pc's.


    google images says ..


    http://cdn.overclock.net/a/ac/1000x2...b1d_pinout.png
    A best design is easily achieved with good test specs™
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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    It is 4 pin connector with 4 wire plus 2 wire wind together...






    Quote Originally Posted by SunnySkyguy View Post
    Molex is a connector company that make 10k different connectors.

    But when consumers say Molex conn. they usually mean the 4 pin conn type inside pc's.


    google images says ..


    http://cdn.overclock.net/a/ac/1000x2...b1d_pinout.png
    Last edited by BradtheRad; 5th July 2015 at 21:03. Reason: Image converted from external server to Edaboard attachment



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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    Ok solved for which pin is 12V
    A best design is easily achieved with good test specs™
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    ... so include all your acceptance criteria ( values, % tolerance) and assumptions in your question or any design.

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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    when i connect the molex cable...it comes to the yellow wire of 12V from the 4 pin..



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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    i am sorry still not able to figure it out....



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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    I'm not sure what the issue is here, as it is quite straight forward.

    Simply connect +12v to the yellow lead, +5V to the red lead, and GND to the remaining two black leads.

    If you are using a standard PC AT/ATX power supply, the above should be sufficient or in this case use your adapter to connect to an existing four conductor female connector from the AT/ATX power supply to power your CD/DVD.

    However, if you are using separate +12v and +5v power supplies, you should also ensure both the +12v and +5v power supplies share a common GND or black leads.

    BigDog

    Update: Specifically, what type and current rated power supply are you attempting to use? Typically, internal CD/DVD drives are spec'd for power requirements in the +5V @ 1.5A, +12V @ 1.5A, range, so if you attempting to power your CD/DVD drive with a el cheapo wall wart, your wasting your time.
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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    Paul12 - whatever you try, DO NOT connect the adapter across the 5V and 12V pins and expect it to work from (5+12=) 17 Volts. It needs +5V with respect to ground and +12V with respect to ground. If you only have two wires from the adapter you MUST wire them to a 12V regulator and a 5V regulator to get the voltages the drive needs.

    If you only wire across the +12 and +5 pins it WILL almost instantly destroy the drive.

    Brian.
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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    Quote Originally Posted by paul12 View Post
    ...I mean i am using as a standalone CD Drive without pc....
    I believe the above statement maybe a significant issue.

    Can you elaborate on what exactly the intended function is of this "Standalone CD Drive?"

    BigDog
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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    @bigdogguru- to give ground connection... 2 black wire must be joined together ? or one must be with 12V and other with 5V ?

    if black wire joined together ...to give ground should they touch any metal body...like mounting the cd in the car .....





    Quote Originally Posted by bigdogguru View Post
    I'm not sure what the issue is here, as it is quite straight forward.

    Simply connect +12v to the yellow lead, +5V to the red lead, and GND to the remaining two black leads.

    If you are using a standard PC AT/ATX power supply, the above should be sufficient or in this case use your adapter to connect to an existing four conductor female connector from the AT/ATX power supply to power your CD/DVD.

    However, if you are using separate +12v and +5v power supplies, you should also ensure both the +12v and +5v power supplies share a common GND or black leads.

    BigDog

    Update: Specifically, what type and current rated power supply are you attempting to use? Typically, internal CD/DVD drives are spec'd for power requirements in the +5V @ 1.5A, +12V @ 1.5A, range, so if you attempting to power your CD/DVD drive with a el cheapo wall wart, your wasting your time.



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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    The black wires are both ground and internally joined in the drive. They are there to ensure the ground connection is a good one, using two wires instead of one is better electrically and mechanically.

    For the two supplies, connect the +5V supply output to the +5V input on the drive and the 0V from the 5V supply to one of the grounds on the drive.
    Connect the +12V supply output to the +12V input on the drive and the 0v from the 12V supply to the other ground on the drive.

    Linking the grounds elsewhere will not cause any electrical problems but if you are using the drive for audio, it is possible you may introduce unintended paths for interference to travel through. For example, you might find that adding an extra ground connection produces a hum on the sound or a whining noise from the motor in the drive.

    May I ask what the drive is intended to do? Without a connection to the SATA/IDE interface you are very limited to what you can use it for.

    Brian.
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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    @brain : sorry ..did not follow... 0V from the 5V supply to one of the grounds on the drive.

    I know i have some limitation in using it ...but still trying to see if i can work with it..

    Quote Originally Posted by betwixt View Post
    The black wires are both ground and internally joined in the drive. They are there to ensure the ground connection is a good one, using two wires instead of one is better electrically and mechanically.

    For the two supplies, connect the +5V supply output to the +5V input on the drive and the 0V from the 5V supply to one of the grounds on the drive.
    Connect the +12V supply output to the +12V input on the drive and the 0v from the 12V supply to the other ground on the drive.

    Linking the grounds elsewhere will not cause any electrical problems but if you are using the drive for audio, it is possible you may introduce unintended paths for interference to travel through. For example, you might find that adding an extra ground connection produces a hum on the sound or a whining noise from the motor in the drive.

    May I ask what the drive is intended to do? Without a connection to the SATA/IDE interface you are very limited to what you can use it for.

    Brian.



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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    Quote Originally Posted by paul12 View Post
    @brain : sorry ..did not follow... 0V from the 5V supply to one of the grounds on the drive.

    I know i have some limitation in using it ...but still trying to see if i can work with it..
    Brian means the 5V supply has two connections one at +5V and another at 0V (relative to the 5V, i.e. it's ground reference). Both of these need to be connected to the CD drive along with the corresponding +12V and 0V if you want the drive to work (if you haven't already blown it up with your "experiments").



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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    Unless you specify CD model or show input options, we can only guess

    These are the most common interface cables.
    Your 6 wire gives 2 options. 12V only (red) or 12,0,0,5 on 4 pin std Molex with 12 on Yellow wire.
    You dont need both connectors.
    http://www.ebay.ca/itm/like/23154782...&ul_noapp=true

    - - - Updated - - -

    The 2 wire 3 pin conn is intended for case fans
    A best design is easily achieved with good test specs™
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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    @sunnyskyguy :- its Lg super multi dvd rewriter model no:- GH22NP21 ;
    5v/12v --1.6A/ 2.0.A

    http://www.lg.com/ca_en/images/digit...y/medium01.jpg







    Quote Originally Posted by SunnySkyguy View Post
    Unless you specify CD model or show input options, we can only guess

    These are the most common interface cables.
    Your 6 wire gives 2 options. 12V only (red) or 12,0,0,5 on 4 pin std Molex with 12 on Yellow wire.
    You dont need both connectors.
    http://www.ebay.ca/itm/like/23154782...&ul_noapp=true

    - - - Updated - - -

    The 2 wire 3 pin conn is intended for case fans



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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    That's an EIDE drive so at least we don't have to worry about SATA power!
    @brain : sorry ..did not follow... 0V from the 5V supply to one of the grounds on the drive.
    Funny how people get my name wrong every time!

    I'll try to explain again,

    You have two options:

    1. If you have a single power source (you said 19V originally) it will have two output wires. One is 0V (ground and is sometimes called the negative wire) and one is +19V. You can connect the ground directly to the middle two pins on the drive power connector. You then have to regulate +19V down to +12V and connect it to the +12V input on the drive power connector AND you have to regulate +19V (the same one) down to +5V and connect it to the +5V input on the drive power connector. Two regulators are needed.

    2. You have two different power sources, one produces 5V and the other 12V. Each has two output wires, one supply has 0V and +5V, the other supply has 0V and +12V.
    Connect the ground (0V) from each supply to the ground on the drive, you can use either of the middle pins on the power connector, they are linked together inside the drive anyway. The +5V wire from the 5V supply goes to the +5V input pin on the drive and the +12V from the 12V supply goes to the 12V input on the drive.

    The two voltages are not alternatives, they must both be present for the drive to work. Usually, the 5V runs the control circuits interface while the 12V runs the spindle and radial motors and the laser.

    Brian.
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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    Quote Originally Posted by bigdogguru View Post
    Can you elaborate on what exactly the intended function is of this "Standalone CD Drive?"
    Quote Originally Posted by paul12 View Post
    if black wire joined together ...to give ground should they touch any metal body...like mounting the cd in the car .....
    I think the intention here is to make a homemade in car CD player, probably patched into the aux input of the car radio.

    And yes, the ground should be connected to the chassis ground of the car.



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    Re: [moved] How to Connect CD ROM Drive with Adapter externally !

    Quote Originally Posted by betwixt View Post
    Funny how people get my name wrong every time!
    Well, at least they are referring to you as "brain," I've certainly been called worse.

    A Freudian slip perhaps?



    @ads-ee

    So why the 19v power supply?

    It seems to be a rather odd voltage source for an automobile, or is that a common voltage level found in automobiles of some country that I'm unaware.

    I suspected it was an old laptop or printer power supply as I see a few in that voltage range.

    In any event, the OP, for some unknown reason, seems to be keeping the specific application close to his chest.

    It's become a bit of a guessing game.


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