Timeline for Determine Target Voltage for Pre-Wired LED
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
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| 20 hours ago | answer | added | fraxinus | timeline score: 1 | |
| yesterday | history | became hot network question | |||
| yesterday | comment | added | jsotola | test them all with a 5 V supply | |
| yesterday | history | edited | jsotola | CC BY-SA 4.0 |
removed irrelevant text
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| yesterday | comment | added | G36 | Yes, the resistor is 560 ohms, so that Vin_max will be around Vin_max = 20mA * 0.56kΩ + 2V = 13.2V. Therefore, you can use it up to a maximum of 15V. | |
| yesterday | history | edited | BoCoKeith | CC BY-SA 4.0 |
added 94 characters in body
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| yesterday | answer | added | JYelton | timeline score: 4 | |
| yesterday | comment | added | BoCoKeith | @Chester - They're all white. I thought about peeling back the heatshrink, but I was hoping to not have to do surgery on each of my LED's. After reading your comment, I peeled one back and found a green/blue/brown/gold resistor which, I think, means 560 ohms? (See second photo.) | |
| yesterday | answer | added | Justme | timeline score: 3 | |
| yesterday | review | Close votes | |||
| yesterday | |||||
| yesterday | comment | added | BoCoKeith | @JYelton - I saw that post. It doesn't work for me because, I think, the LED's I have already have a resistor inline. I'm not trying to figure out the forward voltage of the LED per se, but whether I should try to power it with a 5V or 12V power supply. | |
| yesterday | comment | added | JYelton | Also related: electronics.stackexchange.com/q/705852/2028, electronics.stackexchange.com/q/339458/2028, electronics.stackexchange.com/q/55823/2028 | |
| yesterday | comment | added | Chester Gillon | Do you know what colour the LEDs are, and are they all supposed to be the same colour? With the colour known you can estimate the forward voltage. In the picture in the question is looks like there is a series resistor under the heatshrink on the black wire. Are you able to peel-back enough of the heatshrink closest to the LED to be able to measure the series resistor with your multimeter? | |
| yesterday | comment | added | JYelton | This question is similar to: Easy way to figure out a LED's Vf in order to pick an appropriate resistor. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem. | |
| yesterday | history | asked | BoCoKeith | CC BY-SA 4.0 |