The 75R resistor will still do the job fine, trust me, I'm a doctor.<br><br>Second case (91R), if you measure with the led in circuit you will measure the forward voltage of the led, 2.3v is not ...
One of the questions that hobbyists ask over and over is how to select the value of a current limiting resistor for an LED. Usually the seat of the pants response is: “Subtract 2 V from the supply ...
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