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An LED is a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as putting a series resistor or can get more complicated, involving PWM and multiplexing.

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, in turn, is connected to a red LED. The ground is not connected. When I measure the voltage between the resister and the LED, it is 5V, as expected. When I measure the voltage on the other side of the … LED, it is 3.6V. The LED is not lit, as expected, because the ground is not connected to it. My question is, why is that value 3.6V, and not 5V? When I connect the ground to the LED, The voltage …
asked Sep 22 '16 by Fed
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schematic http://www.perceptiveart.com/Arduino/Clock04_schem.jpg I am making a clock, using 6 rather large 7 segment blue displays. I am wondering 2 things. 1) Do I need a bypass capacitor on the 12 …
asked Jul 14 '16 by Fed
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I am making a clock, using 6 rather large 8 segment blue LED displays. The circuit below is for one of the displays. All the displays run their grounds through the same N-MOSFET at the bottom right … drawing. I calculated (I am a noob) that I need a 105 ohm current limiting resistor on each of the 3 LED segments in order to get 20mA of current to drive the blue LEDs. If each segment draws 20mA, then …
asked Jan 30 '17 by Fed