anemometer

[Don Lancaster]

Don Lancaster wrote...



I couldn't find them.

http://cgi.ebay.com/AN-FMQ-13-V-Win...826302903QQcategoryZ48625QQrdZ1QQcmdZViewItem

be sure to merge the link if it is on two or more lines.

Or go to eBay and search under AN/FMQ-13(V)

Five have been sold; two remain.

--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Ben Bradley]

There was the dual metal ball one that was in the Nov 95 issue of
"Scientific American" A number of folk got good results from these,
and claimed accuracy of a few % and resolution of better than 0.1m/s.

Aha, it's a "The Amateur Scientist" column, "Measuring the Wind
with Hot Metal" by Shawn Carlson. A CD of all the Amateur Scientist

However it operates off 9 volts. DC-DC switcher?

It may be easier to change the circuitry to operate on 3.3V, as
there's very little to it. The circuitry appears to be a heater
(resistor) driven by a 7805 (not needed with a well-regulated 3.3V
source, just lower the resistor to give the same heat at 3.3V as the
one shown gives at 5V) and an op-amp (there are 3.3V ones meant to run
on 'digital' power for modern computers, cellphones and such) to
amplify the difference voltage between two thermocouples. Voltage is
read by a DMM.

 

[Sven Wilhelmsson]

Hmm. What do You think about idea with Wheatston bridge and broken bulb.
Voltage from bridge will be passed on ADC converter.

I think that is a good idea. And I think you should use a fresh bulb,
because once used, the wire get brittle.
/Sven W