[sdiy] ccd as analog delay success!!

[danial stocks]

>
><< So I assume you can also get these from
>  dead VCRs as well????? >>
>
>I've pulled delay lines out of old VCR's, but the ones in those don't seem 
>to
>be IC's or CCD..I don't know what they are. they're generally small plastic
>enclosures with maybe 6 leads coming out the bottom. I'll have to rip one
>apart and see what's inside.

these are fixed length acoustic delay lines. inside is a cut peice of glass 
or quartz, and 2 piezo elements.. signal is applied to one, vibration waves 
set up in the glass element make their way to the other piezo after a finite 
propagation time and then are detected.. quite interesting to look at the 
glass.. sometimes marked with little diamonds - these mark the 'null points' 
- the wave reflects back and forth around the glass a few times in a zigzag 
pattern.. you can see where it goes from the pos of the elements..
Cheers,
Dan

>
>Chris

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