Dead+Battery+Transformer

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errite toroid core  (can also be found in old CFL bulbs) – Old/Used/Homemade Batteries (can also be found in garbage cans or old remote controls you haven’t used in years) – 2N3904 NPN transistor  (almost every kind of electronics has these but the small things like cell phones have teensy ones that you probably won’t want to use) – 1k Ohm resistor  (the size isn’t all that important but will affect the circuit. – LED  (by itself or inside a flashlight) – Multimeter  (optional but it’ll help troubleshoot the circuit) – <span style="color: #ed702b; font-family: Lora,serif; font-size: 16px; text-decoration: none;">22 gauge magnet wire <span style="color: #333333; font-family: Lora,serif; font-size: 16px;">– <span style="color: #ed702b; font-family: Lora,serif; font-size: 16px; text-decoration: none;">AA battery holder

http://mad-science.wonderhowto.com/how-to/make-joule-thief-and-create-zombie-batteries-for-more-power-after-death-0134326/

Don’t throw out that seemingly lifeless battery—it’s not dead yet. A brand-new alkaline battery cell has an electric potential of about 1.5 volts, which drops as the juice runs out. The voltage eventually becomes too low to power most devices, but there’s still energy trapped inside the battery—as much as 15 percent of the original charge. By wiring a circuit called a “joule thief,” you can tap the last of that power to light a white LED. GOOGLE “how to build a joule thief” for different ways to make the device. http://www.popsci.com/joulethief