Use this tool to calculate
the value (ohms) and wattage (watts) of a
dropping resistor for the small bulbs and LEDs
commonly used for locomotive function lighting.
The DCC decoder output voltage can be modified;
however, the default value of
is the standard decoder common (blue
wire on decoder) output voltage and
shouldn't need to be changed.
you select any bulb type other than "Generic
incandescent bulb", then the recommended voltage
and current rating is selected for you
automatically. All you need to do is
hit the "Calculate" button for your result.
choose to continue with a custom voltage and
current selection, then once you have completed
selecting the bulb type, then select the rated
bulb voltage and current from the respective
drop down controls. Hit the "calculate"
button determine the correct resistor value for
you selections. The next highest
"standard" resistor value will be displayed in
the "ohms" box, the actual calculated wattage
will be displayed in "actual wattage" box and
the standard wattage values that the resistors
are manufactured to will be displayed in
"standard wattage" text box.
another selection, hit the "reset" button to
restore the default values.