Basics of designing LED Lighting circuits
In Charging Circuit with battery detection - Electrical Engineering Stack Exchange
3 LED Battery Level Indicator Circuit - Homemade Circuit Projects
Button Batteries/ Coin Cells and Simple Circuits
1.5V battery tester circuit using LM324 - ElecCircuit.com
Efficient LED power supply has battery backup - EDN
Basics: Picking Resistors for LEDs | Evil Mad Scientist Laboratories
LED Driver Circuit with 555 Timer
Lighting an LED Using an Arduino Board — Cool Components
Flashing-LED Battery-Status Indicator Circuit circuit diagram and instructions
Simple Basic LED Circuit (How to Use LEDs) : 4 Steps - Instructables
Simple LED circuit with 9V battery – helloCircuits!
File:9v battery and led circuit components (wires, battery, LED, resistor).jpg - Wikimedia Commons
Battery-Powered Night Lamp Using an Old LED Bulb | DIY Project
Simple LED circuit with 9V battery – helloCircuits!
Easy LED Circuit : 5 Steps (with Pictures) - Instructables
3 Watt, 5 Watt LED DC to DC Constant Current Driver Circuit - Homemade Circuit Projects
3 Simple Ways to Light an Led Bulb with a Battery - wikiHow
Battery and LED without resistor | LEDnique
SC70 LED Driver Drives Six White LEDs from a Single Li-Ion Battery | Analog Devices
Low Battery Indicator using 555 Timer
LED_circuits
