I am looking for help in creating/ designing a LED lighting source that runs off of a 9v battery. They will be used for my cornhole boards for night use. I would like to make a 6" diameter LED lighting source that has as 10-8 white LEDs as bright as I can get it.
Also I would like to make a single strand of LED lights that run in length about 1.5 feet, run off a 9v power supply and support as many LEDs as I can get into the length.
I know that I can buy these online for about bucks. But I really would like to make them myself. Any help will be appreciated. Know that I am handy, but have NO clue as to how to go about tackling this project on. So please be specific.
Buy the LEDs from a source that shows the current and voltage relationship. For example, the LED may operate at 10 milliamps and 2 volts. Put enough LEDs in series to get within a couple of volts of the battery. For example, 3 LEDs in a row would be 6 volts, leaving you with 3 volts of overhead for a good battery, 2 volts as the battery dies. Now pick a resistor to drop the extra voltage. You have to do this, else the LEDs will burn out. For example, r = v / i = 3V / 0.01A = 300 ohms. You might start with a slightly higher resistor to be safe, and experiment. Once you get one of these strands to work, you can make more strands and put them in parallel. Finally, note that LEDs only work in one direction. If you put voltage to them backwards, it will not hurt them, but they will not light. Good luck.
u need more batteries but just a simple toggle switch some crappy speaker wire, led lights, n some common sense.
Buy white LED rated 3 volts or higher. Connect 3 LED in series,therefore,9 volts power source just perfect to light them up directly without need any dropping resistor. Parallel more these 3 LED chains to make as many LED light as you want provided the 9 volts power source has enough power (AH).