EVERYTHING FOR ELECTRONICS
FAB ON FUSION
I enjoyed Jeff Eckert’s note on
Sandia’s progress toward fusion. I also
get the Sandia bulletin (I forget the
name), and I am impressed with what
a good job the people there do.
I was struck by the “as little as
two decades away” at the end of
Eckert’s excellent summary. When I
interviewed at the Forestall labs (
Steller-ator) in 1956, as I recall, they were only
20 years away, and I told them they
wouldn't even get there then if they
didn't hire me — they didn’t on both
counts. And when I visited ORNL’s
DX2 in 1956, they were confident they
were very close to breaking even. I
think mirror leakage killed them and
then they modified the containment
to the Russian system — I forget the
name, and I don’t know what
happened to the project after that.
I do hope the Sandia project reaches practicality for a variety of reasons
(such as up LANL’s nose and a much
needed source of electrical energy).
Thanks for your reviews; I always
I have been struggling to build the
“.01% ACCURATE VOLTAGE REFERENCE” as designed by Doug Malone
on page 52 of the September ‘07 issue.
My problem is that the specification
for D3, an LM431CCZX variable zener
diode, while an accurate number, is
unavailable anywhere I can find (Mouser,
Digi-Key, Avnet, etc.), and Fairchild (the
manufacturer) has none in stock. They
are postponing delivery of two pieces
every 30 days for another 30 days.
I need to find out where these
diodes can be bought, or more importantly, if there is an acceptable substitute.
As a long time subscriber, thanks
for any help you can supply.
Norman Sheldon K0JUP
Published Monthly By
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VP OF SALES/MARKETING
Chuck Hellebuyck Marvin Mallon
Jeff Eckert Russ Kincaid
Fred Eady Michael Simpson
Ron Hackett Louis Frenzel
Vern Graner Jeff Mazur
Larry Cicchinelli Gerard Fonte
Joe DeMeyer Jon Williams
Aaron Dahlen Paul Florian
E.G. (Jerry) Bylander
Response: I find it challenging to
specify readily available components
when an article is written and have
them continue to remain available
when a subscriber attempts to obtain
the parts. Fortunately, in this case, there
are substitutes that are in stock at two
suppliers: Mouser# 511-TL1431CZ;
Digikey # LM431CCZ.
Alas, there is another part in
the design — the X60008 — that is
becoming more difficult
to obtain. I have parts
available and can also
refer interested readers
towards other sources.
Continued on page 95
for monthly columnist
Fred Eady’s newest
Camryn James Mcroy
Weight: 6 lbs 11 oz
Length: 18. 75 inches
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