Re: CD Burner questions

James Perrett <James.Perrett@xxxxxxxxxxxxxxx> wrote:

> On Wed, 7 Sep 2005 16:39:07 +0100, Adrian Tuddenham
> <poppy.uk@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> > James Perrett <James.Perrett@xxxxxxxxxxxxxxx> wrote:
> >
> >>
> >> Do you know who really makes the HHB discs? They used to be made by
> >> Mitsui ...
> >
> > I have heard tell that they have one factory in the US and another in
> > the Far East. I would imagine it would be possible to tell which
> > factory made the disc if you could crack the code printed in the centre
> > void.
>
> There's actually a code recorded on the disc that will tell you who made
> the disc (or more accurately, who made the stamper). You can use various
> software programs to read the code and decode it into something
> understandable.

That's interesting. Do you happen to know if there is a version of the
program for 'Classic' Mac OS (OS 8.6)? I've also been trying to find
Mac software that will read the ISRCs off a disc, to check if my
duplicator is faithfully copying them.


> Thanks also for the circuit description - I might just try hooking an
> oscilloscope up to an old CD player to start with but your circuit gives
> me a few ideas if I want to build something more self contained.

At those signal frequencies, if you design it with 082 op-amps, don't
try to get a voltage gain of more than 3 per device, or a signal of more
than 5v pk. (The limits are imposed by the gain-bandwidth product and
the slew-rate). You will also find problems with the delay per device,
hence my use of that rather strange symmetrical inverter configuration
followed by discrete transistors for rectification.


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
.

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