How hard could it be to turn on an LED? Connect the LED in series with an appropriate resistor and hook it up to a dc source with the correct polarity and voilà, instant LED light. Of course, you can do that with a simple LED “pilot” light, but when it comes to lighting multiple LEDs or designing them into homes or vehicles, it’s more of a challenge. As it turns out, efficiency is a big issue. In most cases, the best way to light an LED is to use specially designed
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