Hi Mike,

Reticon was who I meant, however they seemed to have skipped out of that town,
too.  A further 30 seconds perusal of the Digikey book turned up a bunch of
Panasonic parts of various lengths and permutations.  For a millisecond or two
even the shortest devices would be adequate (sampling-rate limitations rule
here just as they do in digital);  at a stab I'd say the 8-pin DIP MN3009
256-bucket alleged 'low-noise' part at $4.84 would be the one.  It with a 555
to clock it is basically all you'd need.

Other parts listed are MN3003,8,10,11,12, MN3204,6,8,9 and 14 if that helps
you source them closer to home.

       73

               Steve


Steve Dove wrote:

Hi Mike,

Ooooh, analogue.  I remember that.

Possibly still available (I checked the Digikey book without success, but
RS etc. maybe?) would be bucket-brigade delay lines, which were used
extensively for audio effects (delay / spin / reverb etc.) in the olde
days.  Recoton was a manufacturer if memory serves, as I think were
NatSemi, but they've been shedding even less esoteric product than that in
recent years.

They had only so-so noise performance, but their dynamic range would be
plenty good enough for what you're suggesting.  The through delay is
varied by clocking their fixed-length chain of buckets faster or slower.

        73

                Steve        W3EEE  /  G3YDV

Mike Dennison wrote:

> I have been playing around with feeding differently derived audio into
> the two halves of stereo headphones with some interesting results.
> I will report in detail when the tests are complete. In short, it is
> certainly possible to improve headphone reception, both in terms of
> close-in selectivity and resistance to static.
>
> One question. How do I make an electronic circuit to delay a
> broadband audio signal by about one-thousandth of a second,
> without resorting to DSP? Any genius out there with a simple
> circuit? And yes I do know about the methods (that were originally
> used for electric guitar echo) such as connecting the diaphragms of
> a loudspeaker and a microphone by using a spring, and also the
> tape recorder method.
>
> Mike, G3XDV (IO91VT)
> http://www.dennison.demon.co.uk/activity.htm