ok, thank you! I'm definitely a hardware newbie, so I am easily confused :-)
On Monday, January 13, 2014 11:52:15 AM UTC-5, Gerald wrote: > > These are low current very bright LEDs. I had to increase the value in > order to dim them because people were complaining they were too bright. The > power LED, that is also the same value, 4.75K, not 820 ohms.. Check the > latest schematic. The transistor has some voltage drop in it, so even at > 5V, the LED brightness is about the same. > > Gerald > > > On Mon, Jan 13, 2014 at 10:43 AM, <[email protected] <javascript:>> wrote: > >> I'm confused about the resistor values used on the user LEDs on the BBB. >> The first question is, the power LED (D1) is on a 3v3 circuit. The >> datasheet for that LED says the fwd voltage is around 3V @ 20mA. No matter >> how I spin it, i can't figure out how in the world they came up with an 820 >> ohm resistor?? (3.3 - 3.0) = (0.020)(R).. ? >> >> The second question is, the USER LEDs (D2. D3. D4. D5) are on a 5V >> circuit. Yet guess what, they still somehow figured on an 820 ohm >> resistor?? So confused.. >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
