CDROM as CD players - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th September 2002, 06:21 PM   #1
diyAudio Member
 
Lisandro_P's Avatar
 
Join Date: Oct 2000
Location: Argentina
Send a message via ICQ to Lisandro_P
Default CDROM as CD players

I know this was discussed (somehow) before, but i just can't find the thread, so here it goes ... has anyone tried using an old CDROM player as the heart of a homemade CD player? You can get "old" (x6) CDROM drives for cheap (if you don't have one laying in a closet already) that are VERY rugged, have an IDE interfase, and spit both analog audio & S/PDIF data if you hate internal dacs' . I don't know how hard would it be to hook one to a microcontroller through.... any ideas/comments?
  Reply With Quote
Old 16th September 2002, 09:03 PM   #2
diyAudio Member
 
Join Date: Dec 2001
Location: Perth, Western Australia
what do you want the microcontroller for? lcd display?
they generally will operate without being connected to a pc, you just need a small power supply with the molex connector for the 12v and 5v lines.

i have one that is an old drive that has all the transport buttons on the front (drivebay) panel under the drawer - i.e. it has the open/close button, play, next, previous and stop. A lot of them just have open/close or maybe just a play/next too. i was lucky enough also to have some little old power supplies i got out of some old 10bps ethernet hubs, just a little switchmode supply with a single molex output - perfect!

i made up some connectors to convert the little 4-pin analog output to rca sockets and i just run that a short distance to my pre-amp. you can also do this via the headphone socket (i think).

i actually ruined a newer one that has a 2 pin digital output as well, i was going to build an spdif stream dac for it maybe but then i went and wired the molex connector wrong and had the 12v and 5v line reversed! so i fried something badly - it released some of that "magic smoke" that you find in electronics - you know about that stuff? it's what makes electronic components work, so if you make some mistake and it escapes, they are ruined .
__________________
"There's no greater sign of genius than the scorn of fools"
-Albert Einstein.
  Reply With Quote
Old 17th September 2002, 05:13 AM   #3
diyAudio Member
 
Lisandro_P's Avatar
 
Join Date: Oct 2000
Location: Argentina
Send a message via ICQ to Lisandro_P
The microcontroller would be to avoid using the front buttons Besides, you could add a nifty display, programming, shuffle and other things that you miss when you don't have avaliable without much sweat. For the psu a 9vac transformer and a regulator for the 5v are more than adequate i beleive (the 12vdc are used for the "power" devices such as servos, motors, etc, so it can go unregulated). All the micro has to do is to send MFC commands through the IDE port (things like "gimme the table of contents", "start playing track X", "go to time frame XXX") and the CDROM drive makes the rest, that's what makes it so appealing to me. You strip the case, mount it on a nice box, put a new front panel on the tray and you're set!

How did you like the analog output of the cdrom compared to a regular CD deck? I found the threads a bit after i posted this but no one commented on their results. I have to try both the analog output and the S/PDIF connected to a nice D/A, but i just checked out an old cdrom i had lying arround (which is unsuitable for me as the tray is NOT motorized, a pitty...) and the sound quality was VERY good right from the headphones output. I imagine sticking a buffer to the analog out would be even better...

Ah, and about the "magic smoke"... i ran into it more times than i'd like to remeber, yet i somehow manage to keep popping it up I feel your pain!
  Reply With Quote
Old 17th September 2002, 06:10 AM   #4
diyAudio Member
 
Join Date: Jun 2002
Location: Mangalore, Karnataka State, India
Default CDrom as Stand-alone-player

Dear Lisandro,

Your idea is quite feasible. But "learned" people do not advice this. I remember to have asked Tomi Engdahl (you surely know this famous guy and his site) about this. He said, among other things, that a CDrom's DA conversion is not quite upto the HiFi mark and that a CDrom drive has unnecessary complications like error correction circuitry.

I would like know how, vis-a-vis a dedicated audio CD player, a PC CD Rom drive would perform quality-vise.

Could you tell me?
  Reply With Quote
Old 18th September 2002, 01:31 AM   #5
diyAudio Member
 
Lisandro_P's Avatar
 
Join Date: Oct 2000
Location: Argentina
Send a message via ICQ to Lisandro_P
Default Re: CDrom as Stand-alone-player

I'm not arguing about the cdrom's D/A conversion to be nowhere as good as a good hifi cd deck (which doesnt means it sucks like a CD walkman either, but still...). The thing is, a CDROM unit gives you a CD transport with motorized tray that can be controlled with relative ease... and spits S/PDIF data. The rest is unimportant, as you would simply be ignoring it.

As for the quality, it all depends on your work , but old CDROMs drivers in particular are surprisingly rugged, and i doubt you'd get a cleaner *DIGITAL* data stream (without errors) from a CD player than a multispeed CDROM...
All in all, it's just an idea. Sooner i might build one of those small ESP DACs which looked nice and simply hooking it to the CDROM to see the results. If its any good it might start a new project!
  Reply With Quote
Old 18th September 2002, 04:32 PM   #6
Banned
 
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Default Problem is......

Most digital outputs are flawed, from a transmission line point-of-view. They need lots of work to get good results. Not hard, but there is not much room in one of those things.

Jocko
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Any one know this DVD/CDROM KIT ? ECBLN Digital Source 0 17th May 2008 08:05 PM
Different CDROM,different sound?? Leolabs Digital Source 1 20th August 2006 02:54 AM
Cdrom hum pete.a Digital Source 3 23rd March 2005 04:15 PM
Anyone knows NEC CDROM? omar Digital Source 2 8th January 2004 08:45 PM


New To Site? Need Help?

All times are GMT. The time now is 07:52 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2