On the SP15b the lighting pins are 5v so you can get by with a smaller resistor. I use 110-120ohm and have had no issues yet running 3mm and 1.8mm bright white, cool white, and red leds.
Looking good Martin.
Im waiting to see how the lights turn out, I like Lights.
Any thoughts of a ferrite man on the front, from guide to chip?
Some install them and some don't.
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