Simple battery-status indicator uses two LEDs - EDN
50Pcs 3/5/10mm Pre-Wired Round Water Clear Emitting Diode LED Lights DC 9-12V (White Light-10mm) - - Amazon.com
Wiring 3v LEDs, what size battery? - Electrical Engineering Stack Exchange
Create Your Own Battery Backup Power Supplies - Projects
How Does a 5mm LED Work? - LEDSupply Blog
9v battery to parallel 3v LEDs - burnout - Electrical Engineering Stack Exchange
Light Emitting Diode or the LED Tutorial
How Do LED Lights Work? | Tips and FAQs for Wiring LED Lights & More – Evan Designs
Cell Phone Charger Using 1.5V Battery
LED VoltMeter Circuit
Simple battery-status indicator uses two LEDs - EDN
Forward Voltage and KVL | All About LEDs | Adafruit Learning System
How to Make a Light out of Batteries (with Pictures) - wikiHow
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
LEDs for Beginners : 9 Steps (with Pictures) - Instructables
How to use LED circuit in basic ways | ElecCircuit.com
Which Resistor Should I Use with my LED? – Kitronik Ltd
Can I wire a 12v led to a 9v battery? - Quora
What is an LED?
LEDs for Beginners : 9 Steps (with Pictures) - Instructables
LEDs for Beginners : 9 Steps (with Pictures) - Instructables
Tutorial 1: Building a Circuit on Breadboard for Beginners in Electronics
LEDs for Beginners : 9 Steps (with Pictures) - Instructables
LED circuit - Wikipedia
3 State Battery Charge Indicator Circuit
How to connect LED with 9v battery - Resistor, LED, 9v battery connection tutorial - YouTube
Light-Emitting Diodes (LEDs) - learn.sparkfun.com
How to Use a 3W Star LED – Kitronik Ltd
