Electrical schoolwork...

[Brendan K. Walsh]

http://ourworld.compuserve.com/homepages/Bill_Bowden/led.htm

a handy little calculator, i'm planning on doing the same in my cgt, let me
know how it turns out.

"If God had intended us to walk he wouldn't have invented roller skates."
Gene Wilder, Willy Wonka and The Chocolate Factory.
----- Original Message -----
From: "Louis-Alain RICHARD" <laraa at sympatico.ca>
To: <quattro at audifans.com>
Sent: Tuesday, February 10, 2004 12:16 AM
Subject: Electrical schoolwork...


Hi there,

If I were to install some red 3V LEDs to backlight the numerous switches
around the instrument panel of my 1983 urQuattro, what is the resistance
value I must introduce to this circuit to lower the 12V to something more
acceptable?

Resistance value of the LEDs: 150 000 ohms
Ideal voltage at the LEDs: between 2.5V and 3V.
Electrical voltage at the switches: 13.6V, permanent, switched by the
ignition, not the IP rheostat.

My electrical knowledge is so far away (20+ years), I don't remember anymore
how to compute series resistance in a simple circuit like this!

Please light me... and my car!

Louis-Alain
1983 Quattro
85-D-900463