Clark Macaulay wrote:
build process was unable to get 3.80: my dmm reads 3.76 but only at the
extreme end of R1's range.
I forgot to mention that I can only get 3.79, but that seems to be a bug
in the manual. If one assumes U2b (i.e. got the a and b mixed before)
doesn't load the voltage, I think the end stop voltage with all
components nominal is 3.82; that means that 3.76 is less than 2% out, so
within the component tolerances. It looks as though the manual should
really have said set R1 at the end stop.
At first, I didn't think much of it and have started on the Phase II
of the RF board. Your message would imply that the desired 3.80 is
probably a minimum and I can't even reach that! Since I've always had
It's a maximum. The original design didn't have a variable, but it was
found that many people wanted to lower R1 slightly. The material that
describes the mod to the old version gives a better description of how
one should vary R1; the current manual simply says you may want to
adjust it, without any clue as to why.
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
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