Hi Richard,
Yes, used to feel that way - until acquiring a surplus dissecting
(stereo) microscope, now I actually *prefer* surface mount. Much
easier to move parts around, it's easy to apply paste & solder entire
boards in a $50 toaster oven, and access to all the latest parts.
Hard to believe, but really is easier once you can clearly see. For
some nice tuturials, see the sparkfun website, also the schmartboard
website. Also, when I lay out surface mount boards, they tend to be
smaller overall, and so a bit lower cost.
Please do try with a low cost stereo microscope - it changes
everything :)
-Bob
p.s. Finger size is no issue - tweezers work nicely. Oh and surface
mount resistors & caps are unbelievably low cost in cut tape, and
super easy to handle that way. Much better than loose parts IMO.
On Jul 19, 2010, at 4:59 PM, Richard H McCorkle wrote:
The TS272CN is an acceptable substitute for the TS272ACN in the
PICTIC II but as noted has a higher input offset voltage. This
can be compensated for in the second stage by adjustment of
the offset trimmer. I selected premium parts for temperature
stability in the application. Sorry the manufacturers are
making "human compatible" devices obsolete and only carrying
over surface mount devices as they go Pb free for the EU
market. Makes it difficult to keep up with what's available
and harder for amateurs with fat fingers and poor eyesight
like myself to build simple projects!
Richard
Here we go again!
The TS272ACN has just gone 'non-stocked' at Mouser. Will the TS272CN
degrade the performance? It looks like the difference between the
two
is the TS272CN has a higher input offset voltage.
Ed
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