Back in my musician phase i built an echo circuit based on a bucket brigade CCD. I worked pretty well as i remember. I'll dig up a schematic if you like. It was fairly complicated though.
KcW

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> From: Amos Ndegwa <A.NDEGWA@CGNET.COM>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: out of topic
> Date: Friday, August 15, 1997 7:40 AM
>
> Someone to advise me on whether there is an IC(s) that can be used to
> design/build an audio echo circuit with an adjustable time delay. (Not to be
> used on a computer)
>
> Thanks in advance
>
> Amos