[sdiy] Analog Delay Lines (was) [common acronyms?]

[harry]

I've always wanted to do a delay with a phosphor coated disk...
and use optical recording.

I'd use a "flood light" for erase... and maybe a laser or led to write
and a photodiode to read.  I'd have to work out the problems of
signal decay as delays get longer...

OTOH I have a nice digital delay brand new for $125 so....

H^) hary

Ken Stone wrote:

> >Something else thats also been used are spinning magnetic disks.  I have a
> >morley echo pedal that uses one and if I could find some transformer oil
> >that wasnt a deadly poison[2], maybe it would work again.  I've experiemented
> >a little bit with using old 5.25" harddisk platters and making a disc
> >delay like this but have never spent enough time on the mechanics to
> >get it "right"[3].  The theory works okay tho.  This really is just like
> >a tape delay tho.
>
> Have you had any success doing this? I always assumed the media would be
> incompatible with regular tape heads, certainly as a gap must be maintained.
> I guess you could always use the guts out of a floppy disk too.
>
> Ken
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