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You normally don't need LED resistors with the LM3914 but its power dissipation can get high if you are operating in the Bar mode at high LED currents with a high supply voltage. In that case you may need to add a resistor in series with the LED power to keep the LM3914 dissipation below its rating.Is it correct to say that an LM3914 chip doesn't need dropper resistors for LED's? Also the 4017. I also want to use a Green LED 10 Bar Display - Bargraph (SL556). Would I need dropper resistors with this?