How do I figure which LED I need?












4












$begingroup$


I need to replace two LED diodes on a TP4056 board (bottom right corner on the picture).



Enter image description here



The board is going to be in a box and I want to move diodes to the small holes in the box.



There are two resistors with marks 102, and that is 1 kilohm. I measured voltage on diodes and my multi-meter said 2.7 V.



I want to use something like this:



Enter image description here



Those diodes are 3 V 20 mAh. Can they replace exiting diodes?



update:



Thank you guys. You helped me a lot.



Btw, current LEDs are blue and red










share|improve this question









New contributor




mt82 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$












  • $begingroup$
    Welcome to EE.SE. For this question to be any use to future readers it is important that you include the images inline in your question so that it still makes sense when the eBay links die. Not many of us will follow links just to understand what you are asking about. There should be enough information in the question to answer it. The current rating of diodes will be in mA, not mAh which is used as a measure of energy capacity in a battery. There is an edit link below your question ...
    $endgroup$
    – Transistor
    Jan 11 at 19:04








  • 2




    $begingroup$
    An alternate solution is that you could use a light pipe to guide the light from the existing LEDs to the place you want to see it. On some devices the plastic thing you see lighting up is not the LED itself but one end of a light pipe.
    $endgroup$
    – Dithermaster
    2 days ago










  • $begingroup$
    FYI: "LED diodes" stand for "light-emitting diode diodes". Just use "LEDs" instead. Sorry for being a nudnik.
    $endgroup$
    – CYB3R
    2 days ago
















4












$begingroup$


I need to replace two LED diodes on a TP4056 board (bottom right corner on the picture).



Enter image description here



The board is going to be in a box and I want to move diodes to the small holes in the box.



There are two resistors with marks 102, and that is 1 kilohm. I measured voltage on diodes and my multi-meter said 2.7 V.



I want to use something like this:



Enter image description here



Those diodes are 3 V 20 mAh. Can they replace exiting diodes?



update:



Thank you guys. You helped me a lot.



Btw, current LEDs are blue and red










share|improve this question









New contributor




mt82 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$












  • $begingroup$
    Welcome to EE.SE. For this question to be any use to future readers it is important that you include the images inline in your question so that it still makes sense when the eBay links die. Not many of us will follow links just to understand what you are asking about. There should be enough information in the question to answer it. The current rating of diodes will be in mA, not mAh which is used as a measure of energy capacity in a battery. There is an edit link below your question ...
    $endgroup$
    – Transistor
    Jan 11 at 19:04








  • 2




    $begingroup$
    An alternate solution is that you could use a light pipe to guide the light from the existing LEDs to the place you want to see it. On some devices the plastic thing you see lighting up is not the LED itself but one end of a light pipe.
    $endgroup$
    – Dithermaster
    2 days ago










  • $begingroup$
    FYI: "LED diodes" stand for "light-emitting diode diodes". Just use "LEDs" instead. Sorry for being a nudnik.
    $endgroup$
    – CYB3R
    2 days ago














4












4








4





$begingroup$


I need to replace two LED diodes on a TP4056 board (bottom right corner on the picture).



Enter image description here



The board is going to be in a box and I want to move diodes to the small holes in the box.



There are two resistors with marks 102, and that is 1 kilohm. I measured voltage on diodes and my multi-meter said 2.7 V.



I want to use something like this:



Enter image description here



Those diodes are 3 V 20 mAh. Can they replace exiting diodes?



update:



Thank you guys. You helped me a lot.



Btw, current LEDs are blue and red










share|improve this question









New contributor




mt82 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




I need to replace two LED diodes on a TP4056 board (bottom right corner on the picture).



Enter image description here



The board is going to be in a box and I want to move diodes to the small holes in the box.



There are two resistors with marks 102, and that is 1 kilohm. I measured voltage on diodes and my multi-meter said 2.7 V.



I want to use something like this:



Enter image description here



Those diodes are 3 V 20 mAh. Can they replace exiting diodes?



update:



Thank you guys. You helped me a lot.



Btw, current LEDs are blue and red







led resistors diodes






share|improve this question









New contributor




mt82 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




mt82 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 2 days ago









Nick Alexeev

32.2k1063164




32.2k1063164






New contributor




mt82 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked Jan 11 at 19:00









mt82mt82

243




243




New contributor




mt82 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





mt82 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






mt82 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • $begingroup$
    Welcome to EE.SE. For this question to be any use to future readers it is important that you include the images inline in your question so that it still makes sense when the eBay links die. Not many of us will follow links just to understand what you are asking about. There should be enough information in the question to answer it. The current rating of diodes will be in mA, not mAh which is used as a measure of energy capacity in a battery. There is an edit link below your question ...
    $endgroup$
    – Transistor
    Jan 11 at 19:04








  • 2




    $begingroup$
    An alternate solution is that you could use a light pipe to guide the light from the existing LEDs to the place you want to see it. On some devices the plastic thing you see lighting up is not the LED itself but one end of a light pipe.
    $endgroup$
    – Dithermaster
    2 days ago










  • $begingroup$
    FYI: "LED diodes" stand for "light-emitting diode diodes". Just use "LEDs" instead. Sorry for being a nudnik.
    $endgroup$
    – CYB3R
    2 days ago


















  • $begingroup$
    Welcome to EE.SE. For this question to be any use to future readers it is important that you include the images inline in your question so that it still makes sense when the eBay links die. Not many of us will follow links just to understand what you are asking about. There should be enough information in the question to answer it. The current rating of diodes will be in mA, not mAh which is used as a measure of energy capacity in a battery. There is an edit link below your question ...
    $endgroup$
    – Transistor
    Jan 11 at 19:04








  • 2




    $begingroup$
    An alternate solution is that you could use a light pipe to guide the light from the existing LEDs to the place you want to see it. On some devices the plastic thing you see lighting up is not the LED itself but one end of a light pipe.
    $endgroup$
    – Dithermaster
    2 days ago










  • $begingroup$
    FYI: "LED diodes" stand for "light-emitting diode diodes". Just use "LEDs" instead. Sorry for being a nudnik.
    $endgroup$
    – CYB3R
    2 days ago
















$begingroup$
Welcome to EE.SE. For this question to be any use to future readers it is important that you include the images inline in your question so that it still makes sense when the eBay links die. Not many of us will follow links just to understand what you are asking about. There should be enough information in the question to answer it. The current rating of diodes will be in mA, not mAh which is used as a measure of energy capacity in a battery. There is an edit link below your question ...
$endgroup$
– Transistor
Jan 11 at 19:04






$begingroup$
Welcome to EE.SE. For this question to be any use to future readers it is important that you include the images inline in your question so that it still makes sense when the eBay links die. Not many of us will follow links just to understand what you are asking about. There should be enough information in the question to answer it. The current rating of diodes will be in mA, not mAh which is used as a measure of energy capacity in a battery. There is an edit link below your question ...
$endgroup$
– Transistor
Jan 11 at 19:04






2




2




$begingroup$
An alternate solution is that you could use a light pipe to guide the light from the existing LEDs to the place you want to see it. On some devices the plastic thing you see lighting up is not the LED itself but one end of a light pipe.
$endgroup$
– Dithermaster
2 days ago




$begingroup$
An alternate solution is that you could use a light pipe to guide the light from the existing LEDs to the place you want to see it. On some devices the plastic thing you see lighting up is not the LED itself but one end of a light pipe.
$endgroup$
– Dithermaster
2 days ago












$begingroup$
FYI: "LED diodes" stand for "light-emitting diode diodes". Just use "LEDs" instead. Sorry for being a nudnik.
$endgroup$
– CYB3R
2 days ago




$begingroup$
FYI: "LED diodes" stand for "light-emitting diode diodes". Just use "LEDs" instead. Sorry for being a nudnik.
$endgroup$
– CYB3R
2 days ago










3 Answers
3






active

oldest

votes


















9












$begingroup$

enter image description here



Figure 1. Typical IV curves for various colours of LEDs. Image source: LEDnique.



Replacement of any of those small indicator LEDs with 3 or 5 mm LEDs should be fine.



A little bit of background theory may help. LEDs have a non-linear relationship between applied voltage and current. The forward voltage also depends on the colour as shown in Figure 1.



Your measured 3 V LED voltage suggests that you've got either white or blue LEDs on the board. With the 1 kΩ resistor in series the current will be limited to a safe value even if you change to one with a lower forward voltage.






share|improve this answer









$endgroup$





















    7












    $begingroup$

    Based on the schematic in the datasheet, they're not critical, any LED will do.
    enter image description here






    share|improve this answer









    $endgroup$













    • $begingroup$
      Also, when designing something like this it is very common that the manufacturer just implemented the reference design, so chances are high that you will find a red and green (greed?) LED just like shown here.
      $endgroup$
      – pipe
      2 days ago










    • $begingroup$
      These boards often follow the reference design exactly - all the versions I've found or sale have the same color LEDs for indication. There's also an over- and undercharge battery protection circuit on this board - the two packages in the left side, that looks like it's the one here - electronics.stackexchange.com/questions/203463/….
      $endgroup$
      – Phil G
      11 hours ago



















    3












    $begingroup$

    Yes, you can most likely replace the SMD LEDs by any "jellybean" LED. You can easily try it. Do observe the correct LED polarity.






    share|improve this answer











    $endgroup$













    • $begingroup$
      Even getting the polarity wrong is unlikely to hurt anything, it'll just result in the LED not lighting, while the rest of the circuit works normally. And the LED won't be harmed either, so once installed with the correct polarity, it'll be just fine.
      $endgroup$
      – Ben Voigt
      Jan 11 at 23:02






    • 1




      $begingroup$
      Correct. But the LED won't work, that's all I was saying.
      $endgroup$
      – Wouter van Ooijen
      2 days ago











    Your Answer





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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    9












    $begingroup$

    enter image description here



    Figure 1. Typical IV curves for various colours of LEDs. Image source: LEDnique.



    Replacement of any of those small indicator LEDs with 3 or 5 mm LEDs should be fine.



    A little bit of background theory may help. LEDs have a non-linear relationship between applied voltage and current. The forward voltage also depends on the colour as shown in Figure 1.



    Your measured 3 V LED voltage suggests that you've got either white or blue LEDs on the board. With the 1 kΩ resistor in series the current will be limited to a safe value even if you change to one with a lower forward voltage.






    share|improve this answer









    $endgroup$


















      9












      $begingroup$

      enter image description here



      Figure 1. Typical IV curves for various colours of LEDs. Image source: LEDnique.



      Replacement of any of those small indicator LEDs with 3 or 5 mm LEDs should be fine.



      A little bit of background theory may help. LEDs have a non-linear relationship between applied voltage and current. The forward voltage also depends on the colour as shown in Figure 1.



      Your measured 3 V LED voltage suggests that you've got either white or blue LEDs on the board. With the 1 kΩ resistor in series the current will be limited to a safe value even if you change to one with a lower forward voltage.






      share|improve this answer









      $endgroup$
















        9












        9








        9





        $begingroup$

        enter image description here



        Figure 1. Typical IV curves for various colours of LEDs. Image source: LEDnique.



        Replacement of any of those small indicator LEDs with 3 or 5 mm LEDs should be fine.



        A little bit of background theory may help. LEDs have a non-linear relationship between applied voltage and current. The forward voltage also depends on the colour as shown in Figure 1.



        Your measured 3 V LED voltage suggests that you've got either white or blue LEDs on the board. With the 1 kΩ resistor in series the current will be limited to a safe value even if you change to one with a lower forward voltage.






        share|improve this answer









        $endgroup$



        enter image description here



        Figure 1. Typical IV curves for various colours of LEDs. Image source: LEDnique.



        Replacement of any of those small indicator LEDs with 3 or 5 mm LEDs should be fine.



        A little bit of background theory may help. LEDs have a non-linear relationship between applied voltage and current. The forward voltage also depends on the colour as shown in Figure 1.



        Your measured 3 V LED voltage suggests that you've got either white or blue LEDs on the board. With the 1 kΩ resistor in series the current will be limited to a safe value even if you change to one with a lower forward voltage.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Jan 11 at 19:30









        TransistorTransistor

        81.5k778176




        81.5k778176

























            7












            $begingroup$

            Based on the schematic in the datasheet, they're not critical, any LED will do.
            enter image description here






            share|improve this answer









            $endgroup$













            • $begingroup$
              Also, when designing something like this it is very common that the manufacturer just implemented the reference design, so chances are high that you will find a red and green (greed?) LED just like shown here.
              $endgroup$
              – pipe
              2 days ago










            • $begingroup$
              These boards often follow the reference design exactly - all the versions I've found or sale have the same color LEDs for indication. There's also an over- and undercharge battery protection circuit on this board - the two packages in the left side, that looks like it's the one here - electronics.stackexchange.com/questions/203463/….
              $endgroup$
              – Phil G
              11 hours ago
















            7












            $begingroup$

            Based on the schematic in the datasheet, they're not critical, any LED will do.
            enter image description here






            share|improve this answer









            $endgroup$













            • $begingroup$
              Also, when designing something like this it is very common that the manufacturer just implemented the reference design, so chances are high that you will find a red and green (greed?) LED just like shown here.
              $endgroup$
              – pipe
              2 days ago










            • $begingroup$
              These boards often follow the reference design exactly - all the versions I've found or sale have the same color LEDs for indication. There's also an over- and undercharge battery protection circuit on this board - the two packages in the left side, that looks like it's the one here - electronics.stackexchange.com/questions/203463/….
              $endgroup$
              – Phil G
              11 hours ago














            7












            7








            7





            $begingroup$

            Based on the schematic in the datasheet, they're not critical, any LED will do.
            enter image description here






            share|improve this answer









            $endgroup$



            Based on the schematic in the datasheet, they're not critical, any LED will do.
            enter image description here







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Jan 11 at 19:28









            Phil GPhil G

            2,244412




            2,244412












            • $begingroup$
              Also, when designing something like this it is very common that the manufacturer just implemented the reference design, so chances are high that you will find a red and green (greed?) LED just like shown here.
              $endgroup$
              – pipe
              2 days ago










            • $begingroup$
              These boards often follow the reference design exactly - all the versions I've found or sale have the same color LEDs for indication. There's also an over- and undercharge battery protection circuit on this board - the two packages in the left side, that looks like it's the one here - electronics.stackexchange.com/questions/203463/….
              $endgroup$
              – Phil G
              11 hours ago


















            • $begingroup$
              Also, when designing something like this it is very common that the manufacturer just implemented the reference design, so chances are high that you will find a red and green (greed?) LED just like shown here.
              $endgroup$
              – pipe
              2 days ago










            • $begingroup$
              These boards often follow the reference design exactly - all the versions I've found or sale have the same color LEDs for indication. There's also an over- and undercharge battery protection circuit on this board - the two packages in the left side, that looks like it's the one here - electronics.stackexchange.com/questions/203463/….
              $endgroup$
              – Phil G
              11 hours ago
















            $begingroup$
            Also, when designing something like this it is very common that the manufacturer just implemented the reference design, so chances are high that you will find a red and green (greed?) LED just like shown here.
            $endgroup$
            – pipe
            2 days ago




            $begingroup$
            Also, when designing something like this it is very common that the manufacturer just implemented the reference design, so chances are high that you will find a red and green (greed?) LED just like shown here.
            $endgroup$
            – pipe
            2 days ago












            $begingroup$
            These boards often follow the reference design exactly - all the versions I've found or sale have the same color LEDs for indication. There's also an over- and undercharge battery protection circuit on this board - the two packages in the left side, that looks like it's the one here - electronics.stackexchange.com/questions/203463/….
            $endgroup$
            – Phil G
            11 hours ago




            $begingroup$
            These boards often follow the reference design exactly - all the versions I've found or sale have the same color LEDs for indication. There's also an over- and undercharge battery protection circuit on this board - the two packages in the left side, that looks like it's the one here - electronics.stackexchange.com/questions/203463/….
            $endgroup$
            – Phil G
            11 hours ago











            3












            $begingroup$

            Yes, you can most likely replace the SMD LEDs by any "jellybean" LED. You can easily try it. Do observe the correct LED polarity.






            share|improve this answer











            $endgroup$













            • $begingroup$
              Even getting the polarity wrong is unlikely to hurt anything, it'll just result in the LED not lighting, while the rest of the circuit works normally. And the LED won't be harmed either, so once installed with the correct polarity, it'll be just fine.
              $endgroup$
              – Ben Voigt
              Jan 11 at 23:02






            • 1




              $begingroup$
              Correct. But the LED won't work, that's all I was saying.
              $endgroup$
              – Wouter van Ooijen
              2 days ago
















            3












            $begingroup$

            Yes, you can most likely replace the SMD LEDs by any "jellybean" LED. You can easily try it. Do observe the correct LED polarity.






            share|improve this answer











            $endgroup$













            • $begingroup$
              Even getting the polarity wrong is unlikely to hurt anything, it'll just result in the LED not lighting, while the rest of the circuit works normally. And the LED won't be harmed either, so once installed with the correct polarity, it'll be just fine.
              $endgroup$
              – Ben Voigt
              Jan 11 at 23:02






            • 1




              $begingroup$
              Correct. But the LED won't work, that's all I was saying.
              $endgroup$
              – Wouter van Ooijen
              2 days ago














            3












            3








            3





            $begingroup$

            Yes, you can most likely replace the SMD LEDs by any "jellybean" LED. You can easily try it. Do observe the correct LED polarity.






            share|improve this answer











            $endgroup$



            Yes, you can most likely replace the SMD LEDs by any "jellybean" LED. You can easily try it. Do observe the correct LED polarity.







            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Jan 11 at 22:03









            SamGibson

            10.9k41537




            10.9k41537










            answered Jan 11 at 19:24









            Wouter van OoijenWouter van Ooijen

            44.3k150118




            44.3k150118












            • $begingroup$
              Even getting the polarity wrong is unlikely to hurt anything, it'll just result in the LED not lighting, while the rest of the circuit works normally. And the LED won't be harmed either, so once installed with the correct polarity, it'll be just fine.
              $endgroup$
              – Ben Voigt
              Jan 11 at 23:02






            • 1




              $begingroup$
              Correct. But the LED won't work, that's all I was saying.
              $endgroup$
              – Wouter van Ooijen
              2 days ago


















            • $begingroup$
              Even getting the polarity wrong is unlikely to hurt anything, it'll just result in the LED not lighting, while the rest of the circuit works normally. And the LED won't be harmed either, so once installed with the correct polarity, it'll be just fine.
              $endgroup$
              – Ben Voigt
              Jan 11 at 23:02






            • 1




              $begingroup$
              Correct. But the LED won't work, that's all I was saying.
              $endgroup$
              – Wouter van Ooijen
              2 days ago
















            $begingroup$
            Even getting the polarity wrong is unlikely to hurt anything, it'll just result in the LED not lighting, while the rest of the circuit works normally. And the LED won't be harmed either, so once installed with the correct polarity, it'll be just fine.
            $endgroup$
            – Ben Voigt
            Jan 11 at 23:02




            $begingroup$
            Even getting the polarity wrong is unlikely to hurt anything, it'll just result in the LED not lighting, while the rest of the circuit works normally. And the LED won't be harmed either, so once installed with the correct polarity, it'll be just fine.
            $endgroup$
            – Ben Voigt
            Jan 11 at 23:02




            1




            1




            $begingroup$
            Correct. But the LED won't work, that's all I was saying.
            $endgroup$
            – Wouter van Ooijen
            2 days ago




            $begingroup$
            Correct. But the LED won't work, that's all I was saying.
            $endgroup$
            – Wouter van Ooijen
            2 days ago










            mt82 is a new contributor. Be nice, and check out our Code of Conduct.










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