Hello all,
I would like to use an illuminated switch on my upcoming (first) build, with the LED only on when the saber is on. I'm using a 3.7V 18650 battery, NBv4 soundboard, NECree RGB LED, and this red AV switch from TCSS:
http://www.thecustomsabershop.com/12mm-Anti-Vandal-Momentary-Red-Ring-Switch-P927.aspx
Forward voltage 2.0V, runs at 20mA.
I am trying to calculate the resistor that I know I need, but I have no background in electronics (I have been teaching myself a LOT of basic material preparing for this build), so I want to check with people who KNOW what they're doing. I know that the resistor will be dependent on the amount of power available at that point in the circuit, but I also can't find a decent tutorial on where to wire the thing; most tutorials use nonilluminated switches, or don't use resistors, like the TCSS one on youtube.
Any advice I can get on wiring this switch and choosing the right resistor would be much appreciated!