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1.5v LED flashlight circuit Parts list: White LED(20pcs) https://goo.gl/SPCY5o (Transistor Kit https://goo.gl/5csLJy ) Transistor S9012 Transistor S9013 Coil 100uH https://goo.gl/gtYu5u Capacitor 500pF (Ceramic Capacitor kit https://goo.gl/q29Du3 Capacitor 220uF 10v (Capacitor Kit https://goo.gl/6zqbJy ) (Resistor kit https://goo.gl/p4JvQY ) Resistor 5.6k Resistor 10k Resistor 100 ohm 1.5v AAA battery Use the coil of an old CFL lamp. Please subscribe to my YouTube channel here:  https://www.youtube.com/c/EngMousaalkaabi?sub_confirmation=1

By this circuit you can run more than 70 LEDs by an AA battery. The circuit draw 100 to 200 mA from the battery. you can find the choke coil from a mobile charger or old flash camera or rechargeable fly zapper. Parts list: Transistor 2N2222 Resistor 1k Chock coil LED(70pcs) Battery 1.5v NOTE: 1-test the output voltage before connecting that to the parallel LEDs. (2-3v is good) 2-using bigger transformer(choke coil) and power transistor maybe raise the output voltage up to 100v.    

This is an amazing LED flasher that run by only 1.5v AA battery. The circuit based on joule thief method. main circuit was designed by handmade choke coil but i change that to this new circuit that don't need to coil making because that was very difficult. you can use an electric zapper choke coil. the flashing speed can change by potentiometer. A new 1.5v alkaline battery can run this circuit for more than 30 hours(by lowest flashing speed). I test this circuit by 25 LEDs but you can add more. Zapper choke coil usually have 6pin and 3 internal coil. in first you should determine that by an ohmmeter, then put that in the circuit. the temperature of  transistor raise in high speed flashing, so need to a heatsink.  Parts list: Transistor 2N2222 Resistor 100 ohm Potentiometer 1k Capacitor 100uF 35v Chock coil of old camera or electric zapper or mobile charger Battery 1.5v AAA or AA LED Diode 1N4007 Diac DB3  

By this circuit you can run a 4w fluorescence lamp by 1.5v. I test it for running 20w fluorescence lamp, it run but give low brightness . The transistor can be C2500 or 2N3055. You can find the chock coil from an old mobile charger or old camera or electric zapper. NOTE: the output voltage is up to 180v so is dangerous. Parts list: Transistor C2500 Resistor 270 ohm Chock coil of old camera or electric zapper or mobile charger Battery 1.5v AAA or AA LED