Lan Barnes wrote:
On Tue, May 29, 2007 10:07 pm, Tom Gal wrote:
Speaking of software guys......
<Hardware Hat>
Next if you get serious just go to the net and use either
http://www.mouser.com/ or
http://www.digikey.com/
Yep, and if digikey doesn't have it (can't say I checked mouser), probably
no local store will. Why are you using 0.9 volts?
Because my battery is a fracking ice tray with ten pennies and galvanized
washers hanging in brine. This is a SCIENCE PROJECT.
However, it isn't particularly mature to snap at people offering help,
even if the OP has slipped from memory.
So ...
- I don't have time to go on line. I need it today.
- I might be able to increase the voltage by adding up to 4 more cells
scaling (in a perfect world where I don't live) to 1.26 V.
So as delightful as it is to reminisce about fond memories of Gateway, I
think I'll go to Fry's (search parties after 24 hrs if I fail to report
in) and buy the lowest voltage LED they have, and maybe to Home Depot to
shag a few more washers.
The project has to be ready to present Thursday morning.
Thanks to all who answered. It was especially important to learn that 0.9V
is unlikely to work. Saves us the frustration of a failure w/o a clue.
Why does your indicator device have to be an LED?
A simple multimeter (I have one you can borrow) is a good indicator and
works down to at least 0.1VDC. Or you can switch to current and measure
the current through some load like a resistor.
Or you can do the classic experiment that Oersted did[1]. I have all the
parts for that also.
Gus
[1] Run the wire next to a compass and notice the compass needle move.
This is the forerunner of the galvanometer.
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