DW EditSeite anzeigenÄltere VersionenLinks hierherAlles aus-/einklappenNach oben Diese Seite ist nicht editierbar. Sie können den Quelltext sehen, jedoch nicht verändern. Kontaktieren Sie den Administrator, wenn Sie glauben, dass hier ein Fehler vorliegt. CKG Editor <panel type="info" title="Exercise 2.1.2 Calculating a series resistor for a diode"> <WRAP group><WRAP column 2%>{{fa>pencil?32}}</WRAP><WRAP column 92%> You want to drive a red light-emitting diode on a voltage source of $U_s = 5.0 ~V$ with a current of $I_D = 20 ~mA$. On the web, you have found a voltage drop of $U_D = 2.3 ~V$ for red LEDs. Now you want to know which resistor from the E12 series (available to you) is the correct one. - Draw the circuit of the LED with series resistor and plot the voltages. - What must be the value of the series resistor $R_V$ to give the voltage drop $U_S$ above? - In the red LED datasheet {{elektronische_schaltungstechnik:tlur640.pdf|TLUR6400}}, find the relationship between forward voltage and forward current. What voltage drop $U_D$ can be determined from this for $I_D = 20 ~mA$ and what is the correct series resistance? <WRAP onlyprint> \\ \\ </WRAP> - Briefly compare the different results considering the [[https://en.wikipedia.org/wiki/E_series_of_preferred_numbers#Lists|E12 series]]. <WRAP onlyprint> \\ \\ </WRAP> </WRAP></WRAP></panel> <WRAP pagebreak></WRAP>