pseudo-random shift generator

[jean-charles maillet]

>A minor comment about the digital noise source - it is generated by a
>pseudo-random shift generator. The problem is that the period repeats
>every few seconds - this is 99% of the time not a problem but in cases
>where you have long periods of nothing but noise, the repetative nature
>is very obvoius.  It is possible to build longer length PSR-SG's but the
>chip count gets a bit much compared to the traditional back-biased
>analog transistor unit.
>
>David Halliday

I'm interested in these circuits a great deal myself, perhaps you could
detail the circuit you're using (text description or gif file ?!) ... I was
wondering and suspect that you could generate longer sequences by cross
coupling two such circuits, as in a dual feedback arrangement ... by this I
mean two complete random generator circuits except the outputs are fed back
to the inputs from there or something (possibly further nored or exored
using intermediate bits) ... doubling the circuit wouldn't be objectionable
complexity-wise I wouldn't think.

jc

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