How to convert a 220V light bulb to a 3.7V, 9V, or 12V battery
Learn how to convert a 220-volt LED bulb to use a 3.7-3.8-6-7.4-9- or 12-volt Li-Ion battery yourself, and why the LEDs don't light or simply burn out after conversion.
DIY Zener Diode and LED Tester
• Был джоуль вор а теперь прибор для проверк...