Re: ATM A little electronic help on my Foucault tester

[Daniel Fundo <fundo@bellsouth.net>]

<<  >>That's a nice handy method for figuring the resister values. Do
you have a reference for other convenient data computation like that?<<

Thanks. Unfortunately, that's a "one-off" for me of ohm's law (E = IR,
where E = volts, I = amps,and R = ohms). Back in the old days, when I
learned electronics (with vacuum tubes!) there were only 3 things you
had to know:

        E = IR  (voltage is current times resistance)
        W = EI  (power in watts is voltage time current)
        sum(I) = 0      (the sum of currents into and out of any point
is 0)

They're still all true, but some devices act funny (like the LED, which
has a constant voltage drop across it).  >>

If you are willing to learn something, get:

"The Art of Electronics" by Paul Horowitz and Winfield Hill.
The Cambridge University press. ISBN 0-521-37095-7

This is probably the best biginners book available on electronics.  It's
been around for a while, but everything still holds true, like Mike
said.  My son has my copy, but I'm pretty sure there is a section on
LEDs in the lastest edition/printing.

*****-----
Dan F.
Secretary/MAS
Memphis, TN