gjohnston
Slow Learner
OK, I am not an electrical guy. Ohms, watts, whatever.
I want to power my control panel bi directional (red and green) LEDs from my Tortoise power wires so that when the polarity of the machines changes the lights will turn from red to green and vice versa. The voltage going to the Tortoise machines is 9 volts. The LEDs are 3mm units that require 2 to 2.1 volts depending on which way the current flows. I don't want to wire them in series, yes I know you don't need a resistor if you do it that way. The problem with this setup is if, or when, an LED fails the Tortoise will be rendered inoperable as well. The LEDs will be wired in parallel with one lead of the LED attaching to one power wire of the Tortoise and the other lead of the LED attaching to the other power wire of the Tortoise.
Question: What size resistors do I need?
Thanks for the help.
Greg
I want to power my control panel bi directional (red and green) LEDs from my Tortoise power wires so that when the polarity of the machines changes the lights will turn from red to green and vice versa. The voltage going to the Tortoise machines is 9 volts. The LEDs are 3mm units that require 2 to 2.1 volts depending on which way the current flows. I don't want to wire them in series, yes I know you don't need a resistor if you do it that way. The problem with this setup is if, or when, an LED fails the Tortoise will be rendered inoperable as well. The LEDs will be wired in parallel with one lead of the LED attaching to one power wire of the Tortoise and the other lead of the LED attaching to the other power wire of the Tortoise.
Question: What size resistors do I need?
Thanks for the help.
Greg