| Forum Home | ||||
| Press F1 | ||||
| Thread ID: 112355 | 2010-09-02 07:49:00 | LED wiring | qazwsxokmijn (102) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 1133876 | 2010-09-02 07:49:00 | So I've bought some 12v prewired LEDs that connects to a molex power connector from the power. To reduce cable clutter I modded a couple so I could connect them to the 3-pin motherboard fan connector. Both power sources give 12v, but when connected to the motherboard fan connector the resistor inside the wiring gets very hot and one LED burnt and died. Why is that? If both power sources (the molex connector and motherboard fan connector) give off 12v, why is the latter burning my LEDs?? :confused::confused::confused: |
qazwsxokmijn (102) | ||
| 1133877 | 2010-09-02 07:58:00 | Dont know if this will help. www.kpsec.freeuk.com Have a look under Calculating an LED resistor value | Speedy Gonzales (78) | ||
| 1133878 | 2010-09-02 08:00:00 | Dont know if this will help. www.kpsec.freeuk.com Have a look under Calculating an LED resistor value :waughh::waughh::waughh: As you can probably tell, I am electrically-challenged. |
qazwsxokmijn (102) | ||
| 1133879 | 2010-09-02 08:02:00 | What are the ohms of the resistor/s you used? | Speedy Gonzales (78) | ||
| 1133880 | 2010-09-02 08:09:00 | No idea. They are prewired and hidden underneath heatshrinks. And...resistors? :waughh: |
qazwsxokmijn (102) | ||
| 1133881 | 2010-09-02 08:10:00 | Ok then. what are the colours on the end of the resistor/s then. If you can see them | Speedy Gonzales (78) | ||
| 1133882 | 2010-09-02 08:11:00 | No idea. They are prewired and hidden underneath heatshrinks. And...resistors? :waughh: Well resistor then :p Change the colours here. www.dannyg.com See what it says |
Speedy Gonzales (78) | ||
| 1133883 | 2010-09-02 08:20:00 | Well I would tell you....but it's burnt. :p I can tell one band on one end is red though..... | qazwsxokmijn (102) | ||
| 1133884 | 2010-09-02 09:29:00 | Don't know, but maybe this is relevant. Electrical polarity Main article: Electrical polarity of LEDs As with all diodes, current flows easily from p-type to n-type material.[72] However, no current flows and no light is produced if a small voltage is applied in the reverse direction. If the reverse voltage becomes large enough to exceed the breakdown voltage, a large current flows and the LED may be damaged. If the reverse current is sufficiently limited to avoid damage, the reverse-conducting LED is a useful noise diode. en.wikipedia.org |
KarameaDave (15222) | ||
| 1133885 | 2010-09-02 10:16:00 | That quote lost me in the first sentence.....:D | qazwsxokmijn (102) | ||
| 1 2 | |||||