NE572 compander as envelope follower

Paul Perry pfperry at
Wed Jun 18 03:56:21 CEST 1997

probably some terrible breach of nettiquet to reply to ones own
as i have said before almost every purely analog design question asked here
has been answered in horowitz&hill the art of electronics
and there on p305 of the 2nd edition is a 'capacitance multiplier' which
could be just the thing to make the attack & decay caps on the NE572
envelope follower section variable.......
i must say it isn't easy to make a proper envelope follower....i think the
NE572 could be the answer....
paul perry

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