I build the thing some time ago following that same schematic, in fact I build a double one, and they have been working from the start without a hitch. See my earlier post:
I remember that the pulse must not be too long, then the LF won’t sample. There is a remark about this in the datasheet I believe.
If you get it to work then here are some implementation ideas:
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You want more than 1 S&H !
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The capacitors I mounted in a partial IC-socket so that I could experiment with different types and values without the need for extra soldering.
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I installed 2 trigger inputs but combined the trigger ins of the 2 circuits via the switch in the input jack. The second S&H will take the trigger from the 1st unless it gets a trigger signal itself (and v.v.).
