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markob85

Member - Posts: 1

Joined: May 28, 2005

Location: Yugoslavia

Posted: May 30, 2005 at 6:13 AM / IP Logged

I don't know how to conect more leds(two) on the computer. I use 5Volts supply, and I must use resistor to conect LED(3 Volts). Which resistor to use? Led is same as led on the front side of the computer (HDD,PWR).

5V+resistor?=3V. ??????????????????

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ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: June 01, 2005 at 11:24 AM / IP Logged

Besides the LED voltage, we need to know the current specs. Plug them into Ohms law (in your case R=E/I) to get your resistor size. Typical LEDs run about 25mA so you would have

R= (5-3)/.025

R= 80 Ohms

Not a common size, closest is 100 Ohms. This would give you 20mA drive, and you should be fine.

Something else you could do would be to get the same size resistor that is already in use on the computer

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