Changes
/* Calculation */
</math>
= '''80 mW'''
==== Resistor in end line for horizontal sgement ====
if the segment is alone, the end line resistor is of (example each element of the M letter) :
<math>
R_{1LED} = \frac{Vcc - U_{seg_{LED}}}{I_{LED}} = \frac{12V - 2V}{20mA}
</math>
= '''500 Ω'''
Power dissipated by the resistor Rseg:
<math>
P_{R_{1LED}} = R_{1LED} \cdot I_{Led}^2 = 500 \cdot (20mA)^2
</math>
= '''200 mW'''
if the segments are linked by two, the end line resistor is of (example for the F letter) :
<math>
R_{LEDs} = \frac{Vcc - U_{LED}}{I_{LED1} + I_{LED2}} = \frac{12V - 2V}{20mA + 20mA}
</math>
= '''250 Ω'''
<math>
P_{R_{LEDs}} = R_{LEDs} \cdot (2*I_{Led})^2 = 250 \cdot (40mA)^2
</math>
= '''400 mW'''
if the segments are linked by three, the end line resistor is of (example for the E letter) :
<math>
R_{LEDs} = \frac{Vcc - U_{LED}}{I_{LED1} + I_{LED2} + I_{LED3}} = \frac{12V - 2V}{20mA + 20mA +20mA}
</math>
= '''167 Ω'''
<math>
P_{R_{LEDs}} = R_{LEDs} \cdot (3*I_{Led})^2 = 250 \cdot (60mA)^2
</math>
= '''601,2 mW'''
= Layout =
