RC-Monster Forums - View Single Post

BrianG · 04.18.2010, 04:53 PM

Neil, if you are going to power lights from the servo's motor outputs, you should still use a resistor. The only thing saving the LED right now is the low servo input voltage (minus the H-bridge v-drops), but running LED(s) directly like that will severely shorten their life. Theoretically, the current through the LED is only limited by the wiring: (Vsupply-Vf)/resistance. But since the LED Vf value does change with current, it will work for a while.

	(#5)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	04.18.2010, 04:53 PM Neil, if you are going to power lights from the servo's motor outputs, you should still use a resistor. The only thing saving the LED right now is the low servo input voltage (minus the H-bridge v-drops), but running LED(s) directly like that will severely shorten their life. Theoretically, the current through the LED is only limited by the wiring: (Vsupply-Vf)/resistance. But since the LED Vf value does change with current, it will work for a while.