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How to Calculate the Value of Resistor for LEDs Circuits?
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Simple LED circuit with 9V battery – helloCircuits!
Can the same 9V supply used to power Arduino, also be used on the output side of a relay? - Project Guidance - Arduino Forum
power supply - Should I use resistors for LED - Electrical Engineering Stack Exchange
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How to connect LED with 9v battery, Resistor, LED, 9v battery connection tutorial - YouTube
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L1: Turning on an LED - Physical Computing
Simple LED circuit with 9V battery – helloCircuits!
Simple Basic LED Circuit (How to Use LEDs) : 4 Steps - Instructables
LED Resistor Values | Current Limiting Resistor
L1: Turning on an LED - Physical Computing
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Basics: Picking Resistors for LEDs | Evil Mad Scientist Laboratories
