Question

Redesign the LED interface shown in figure 4.20 if the four LEDs operated at 1.9 V and 1 mA. In particular, recalculate the required resistor values if we were to change to these LEDs.

+3.3V 51 0W +3.3V LED 3 51 0W +3.3V LM 3S/ PD3 TM 4C LED 2 510W +3.3V PD 2 PD1 PD LED1 51 0W LEDO Resistors are 5% 1,8 watt LEDis HLMP-4740 Figure 4.20. Hardware circuit for the LED output system

Answer 1