Subject: Re: Design a simple switche circuit to control CD ROM
Date: Thu, 26 Dec 2002 23:38:59 -0500
References: <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: 27 Dec 2002 04:39:18 GMT
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On Thu, 26 Dec 2002 17:56:11 GMT, firstname.lastname@example.org
(Ben Bradley) wrote:
>In sci.electronics.design, TheWonderLand wrote:
>>I want to design a simple interface or a series of switches that can
>>command the 48X Goldstar/LG Electronics CD ROM to fast forward,
>>reverse, play, and pause audio CD.
> Since you seem to know the make and model, go to the manufacturer's
>website and see if this kind of interface is in the technical info.
> If not, try playing with some unused pins or connections somewhere
>on the thing (not used for the IDE or whatever-it-uses interface). I
>may be wrong, but ISTR a schematic of some old CDROM drive that you
>just wire up switches with pullups to a few connections on it and you
>have those functions without adding any logic. The fact that CDROM
>drives can/will play an audio CD (through the 1/8" jack on the front
>panel, and going through the volume control) just by putting it in the
>drive suggests to me that these controls might be built in to the
> If that doesn't answer your question, there's at least one CDROM
>peripherals newsgroup under the comp.* hierarchy, ask there.
I agree with you totally. It can be done without adding an extra
controller. I have found many discussion about adding extra
controller to the IDE interface to do the same job. I really do not
like those ideas since the controller built in the unit itself.
Thanks for your suggestion.