Hello,
I wanted to ask a pretty simple question about the usage of a potentiometer with four LEDs in a series circuit.
I've drawn up a simple series circuit with 4 identical LEDs, 1x 10k Ohm potentiometer and a lab PSU set to 12V. Circuit below with info about the LED.
As I understand, the circuit shall work but another resistor is ideal so that I do not blow the LEDs when the pot is set to the minimum, i.e. 0 Ohm...
Question: For four LEDs with the electrical info stated, what would be the recommended absolute minimum additional resistor value to add into this circuit so I do not blow the LEDs when the 10k pot is at the minimum position?
Question 2: If I increased the number of LEDs to 73 (total), what would be the recommended minimum resistor value to add into the circuit, like question 1? Can you show mathematically how to calculate?
Appreciate your help for a pretty simple question I am sure!!
I wanted to ask a pretty simple question about the usage of a potentiometer with four LEDs in a series circuit.
I've drawn up a simple series circuit with 4 identical LEDs, 1x 10k Ohm potentiometer and a lab PSU set to 12V. Circuit below with info about the LED.
As I understand, the circuit shall work but another resistor is ideal so that I do not blow the LEDs when the pot is set to the minimum, i.e. 0 Ohm...
Question: For four LEDs with the electrical info stated, what would be the recommended absolute minimum additional resistor value to add into this circuit so I do not blow the LEDs when the 10k pot is at the minimum position?
Question 2: If I increased the number of LEDs to 73 (total), what would be the recommended minimum resistor value to add into the circuit, like question 1? Can you show mathematically how to calculate?
Appreciate your help for a pretty simple question I am sure!!