What’s inside an aircraft seatbelt sign? (and swivel downlight)
Published on June 20, 2017
It’s always kinda nice to see inside components not readily available to ordinary mortals, so here’s a look inside a couple of LED aircraft components. Mainly notable for the well-engineered approach common with aircraft electronics.
The Darlington transistor (two cascaded transistors internally for higher gain) may be a very simple soft-start device that is basically a transistor with a base resistor from the positive rail and capacitor to negative rail so it turns on slowly. That could be to emulate a tungsten lamp lighting or to avoid high inrush current at power-up.
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