NBv3 Blade Mirror CC LED Resistor Check

Just making sure I'm looking at this right...

Accent LED for CC to be run in parallel with the main blade color:

LED FV: 3.4v
LED current: 20mA
Battery voltage: 3.7v

This gives me a 18ohm 1/8w resistor?

Looks right to me.

Quote:

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Originally Posted by Silver Serpent

Looks right to me.

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Thank you. I was asking because it is a tiny resistor, and physically seems odd to me coming off the main blade LED lines. But the math works out.

Think of it like a highway exit ramp. Many cars (current) are coming along the highway. Most of them continue on past the ramp (towards the main LED), and you'd need a larger resistor to dissipate a certain fraction of them. But only a few exit via the ramp, so you only need a tiny resistor to dissipate the same fraction of those.

Attachment 15286

Worked like a charm!