[sdiy] Scavenging the electronics graveyard

[Ken Stone]

2 pi R not 2 pi D so about 1/2 the figure quoted.

>On Mon, 22 Oct 2007 10:59:00 +0200 (CEST) Rainer Buchty <rainer at buchty.net>
wrote:
>
>> On Mon, 22 Oct 2007, JH. wrote:
>> >
>> > >I have always wanted to make some sort of analog delay using a floppy
disk 
>> > >drive! Never gotten around to that though...
>> > 
>> > Or something like a Mellotron!
>> 
>> Neat idea. Although polyphony would be impossible with a single disk, 
>> that very disk could in theory store up to 160 (well, 164, if you go to 
>> the limits -- after all, the Atari ST had superformatters up to 82 
>> tracks) keys.
>> 
>> Would of course require an adapted motor control to adjust the rotation 
>> to track length.
>> 
>> Or a polyphonic machine, one drive per key and 128 velocity settings...
>> 
>> Seeking time will probably forbid any track movement, though, so it's 
>> still possible to have up to 164 instruments on a disk. About 16kB seem 
>> to be the upper (digital) limit for MFM. But then, the outmost track is 
>> around 55cm long (3.5"*2.54*2*PI) -- at standard compact cassette speed 
>> instead of 300rpm that's almost 12 seconds.
>
>Um, are you sure with "2*pi" ...?
>(That would be half a meter for such a small floppy...)
>
>Christian
>
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Ken Stone   sasami at hotkey.net.au
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