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== 5.0v - 3.3V voltage drop via red LED ==
 
== 5.0v - 3.3V voltage drop via red LED ==
  
The average red LED has a 1.7V voltage drop.  This property can be (ab)used to power very small 3.3V IC's from a 5.0V power supply -- put the LED in series with the 5V line.  There probably won't be enough power used to light the LED properly, but this does not matter for the voltage drop property.
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The average red LED has a 1.7V voltage drop.  This property can be (ab)used to power very small 3.3V IC's from a 5.0V power supply -- put the LED in series with the 5V line.
  
 
== further reading ==
 
== further reading ==

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