CD-Rom to RCA audio project

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This hardware project forms part of the larger [[Micronik Infinitiv A1200 Tower Case Project]].   
This hardware project forms part of the larger [[Micronik Infinitiv A1200 Tower Case Project]].   
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This small project is designed to create a connector to route the audio from an internal CD-Rom drive out of the computer's case to a pair of RCA Phono audio connectors mounted on a PCI style backplate; making it easy to then connect the audio to an external set of speakers or amplifier.
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This small project is designed to create a connector to route the audio from an internal CD-Rom drive out of the computer's case to a pair of RCA Phono audio connectors mounted on a PCI style backplate; making it easy to then connect the audio to an external set of speakers or an amplifier.
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+
   
   
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While i was doing my [[Micronik Infinitiv A1200 Tower Case Project|A1200 Tower Project]], after getting the CD-ROM working i notice that something was missing, in other systems there is a cable connecting the CD-ROM to the audio card, with that you can listen to music (analog) without software running. The Amiga has his own sound system on board (well is possible to upgrade it…), so i think how i will connect my CD-ROM to the sound outputs without using the processor? I didn't want to modify the original RCAs  that my A1200 board has, so the best option was to create a new par of RCAs.
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While working on my [[Micronik Infinitiv A1200 Tower Case Project|A1200 Tower Project]], after getting the CD-ROM working, I noticed that something was missing. In other systems there is a cable connecting the CD-ROM drive to the audio card, allowing you to listen to music without any software running (directly from the CD drive). The Amiga has its own sound system on board (well it is possible to upgrade it…), so I then had to think of a way to connect the CD-ROM drive to the Amiga's sound output without using the processor? I didn't want to modify the Amiga's original RCA Phono connectors that are on the A1200's board, so the best option was to instead create a new pair of RCA Phono connectors for the CD-Rom audio.
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Usually CD-ROM come with a audio cable to connect a sound card (PC), the cable usually has 4 pins:  
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Usually CD-ROM drives come with an audio cable to connect to a sound card (PC), and this cable usually has 4 pins:  
   
   
*pin 1 - Left signal output
*pin 1 - Left signal output
Line 31: Line 31:
*pin 3 - Ground
*pin 3 - Ground
*pin 4 - Right signal output
*pin 4 - Right signal output
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(there are cables with only 1 ground, i think)  
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:(there are some cables with only 1 ground, i think)  
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So, what i did was:  
So, what i did was:  
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* the cd-rom cable connector, goes obviously to the cd-rom
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* the other  connector that goes to the sound card, i cut it
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* The CD-Rom drive cable connector, is connected to the CD-Rom drive as normal.
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now a soldering work:
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* The other end of the connector that normally goes into the sound card was cut off ready for some soldering work as follows:
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* the right signal output (pin 4) goes to the center pole of right RCA
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:* the right signal output (pin 4) goes to the center pole of right RCA
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* the adjacent wire of the right signal output (pin 3) goes to the outer pole of right RCA
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:* the adjacent wire of the right signal output (pin 3) goes to the outer pole of right RCA
next step depends of type of cable, some sound blasters use one ground in pin 1 or 4,   
next step depends of type of cable, some sound blasters use one ground in pin 1 or 4,   
but the majority of card use both ground in pins 2 and 2 (in center)
but the majority of card use both ground in pins 2 and 2 (in center)
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* the left signal output (pin 1) goes to the outer pole of left RCA
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:* the left signal output (pin 1) goes to the outer pole of left RCA
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* the adjacent wire of the right signal output  (pin 2 ) goes to the center pole of left RCA
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:* the adjacent wire of the right signal output  (pin 2 ) goes to the center pole of left RCA
 +
 
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(diagram to follow)
   
   
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If sound doesn't look good, or some channel is missing, try to swap pins (3 and 4) or (1 and 2), so try it, before soldering.
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If sound doesn't work correctly, or one of the channels is missing, try to swap pins (3 and 4) or (1 and 2).  Test this before soldering to make sure it is correct.
   
   
Now that i had the RCAs created, i needed a place to put them, my [[Micronik Infinitiv A1200 Tower Case Project|A1200 Tower ]] has some slots available (not using any so far) so i though it was the only logical place to put them, but i need a slot slot cover. I found an old parallel slot in basement, so i use it to hold down the RCAs. I remove the parallel connector, cut it to host the RCAs. to fill the empty spaces and to give a solid work i use hot glue, to get all together, after, i cut the excess glue and just painted white.  
Now that i had the RCAs created, i needed a place to put them, my [[Micronik Infinitiv A1200 Tower Case Project|A1200 Tower ]] has some slots available (not using any so far) so i though it was the only logical place to put them, but i need a slot slot cover. I found an old parallel slot in basement, so i use it to hold down the RCAs. I remove the parallel connector, cut it to host the RCAs. to fill the empty spaces and to give a solid work i use hot glue, to get all together, after, i cut the excess glue and just painted white.  
   
   
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It is not yet finished but you can get a look about what it will be.
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This project is not yet finished but you can get an idea of what it will be like from this information.
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+
==Project Gallery==
==Project Gallery==

Revision as of 09:39, 28 November 2008

CD-Rom audio to RCA (Phono) output

CD-Rom to RCA Audio
Created 2008
Creator Tiago
Based On Custom hardware
Kickstart n/a
Operating System n/a
CPU n/a
Memory n/a

Contents

Hardware Spec/Parts Needed

  • RCA audio cable with left and right phono connectors
  • CD-Rom audio cable
  • PCI style metal backplate
  • Hot Glue Gun

Project details

This hardware project forms part of the larger Micronik Infinitiv A1200 Tower Case Project.

This small project is designed to create a connector to route the audio from an internal CD-Rom drive out of the computer's case to a pair of RCA Phono audio connectors mounted on a PCI style backplate; making it easy to then connect the audio to an external set of speakers or an amplifier.

While working on my A1200 Tower Project, after getting the CD-ROM working, I noticed that something was missing. In other systems there is a cable connecting the CD-ROM drive to the audio card, allowing you to listen to music without any software running (directly from the CD drive). The Amiga has its own sound system on board (well it is possible to upgrade it…), so I then had to think of a way to connect the CD-ROM drive to the Amiga's sound output without using the processor? I didn't want to modify the Amiga's original RCA Phono connectors that are on the A1200's board, so the best option was to instead create a new pair of RCA Phono connectors for the CD-Rom audio.

Usually CD-ROM drives come with an audio cable to connect to a sound card (PC), and this cable usually has 4 pins:

  • pin 1 - Left signal output
  • pin 2 - Ground
  • pin 3 - Ground
  • pin 4 - Right signal output
(there are some cables with only 1 ground, i think)

So, what i did was:

  • The CD-Rom drive cable connector, is connected to the CD-Rom drive as normal.
  • The other end of the connector that normally goes into the sound card was cut off ready for some soldering work as follows:
  • the right signal output (pin 4) goes to the center pole of right RCA
  • the adjacent wire of the right signal output (pin 3) goes to the outer pole of right RCA

next step depends of type of cable, some sound blasters use one ground in pin 1 or 4, but the majority of card use both ground in pins 2 and 2 (in center)

  • the left signal output (pin 1) goes to the outer pole of left RCA
  • the adjacent wire of the right signal output (pin 2 ) goes to the center pole of left RCA

(diagram to follow)

If sound doesn't work correctly, or one of the channels is missing, try to swap pins (3 and 4) or (1 and 2). Test this before soldering to make sure it is correct.

Now that i had the RCAs created, i needed a place to put them, my A1200 Tower has some slots available (not using any so far) so i though it was the only logical place to put them, but i need a slot slot cover. I found an old parallel slot in basement, so i use it to hold down the RCAs. I remove the parallel connector, cut it to host the RCAs. to fill the empty spaces and to give a solid work i use hot glue, to get all together, after, i cut the excess glue and just painted white.

This project is not yet finished but you can get an idea of what it will be like from this information.

Project Gallery

Mini A1200

"A1200T back with RCAs image 1" Case back

Additional Reading

See also:

Reference

Retrieved from "http://wiki.classicamiga.com/CD-Rom_to_RCA_audio_project"
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