How to Make LEDs That Turn on when You Open Your Locker: 9 steps. How to Make LED Throwies: 5 steps. Edit Article Edited by Luke O'Brien, ComputerGeek, Zack, Dave Crosby and 16 others An LED Throwie is a fun, cheap and pretty decoration ideal for fridges. It will stay lit for about a week, but they are easy to make so you should never run out! Ad Steps 1Know your battery. 5Throw the Throwie. Tips If you own a steel bridge or tower, you can throw a bunch of these up very high and stick them to form lighted designs in the dark.
Warnings Always dispose of the batteries safely.Don't let little children swallow the throwie or batteries. How to Light Multiple LEDs: 7 steps. How to light several LEDs. In a previous article Chris Gosling showed us how to light an LED. In this article, Chris goes on to show us what to do if we want to light more than one. In the previous article we built a circuit that looked something like this: Okay, so it wasn't exactly like that. In the previous article we used a 9V battery whereas in the circuit above we've use two 1.5V cells in series to give us a 3V supply. This means that we have a different resistor value. We've also added a switch so we can turn the circuit on and off without having to disconnect the battery. So, how about a couple more? If you've built, or at least understand, what's involved in lighting up a single LED then you have already mastered all the hard stuff and we're not going to rehash everything we covered in that first article.
LEDs in Parallel This is the simplest way to do it but it does have a drawback however in that it will use up your batteries quicker. It is important to note that each LED has it's own resistor. Note that: How to light an LED. So you want to cast a lighting spell without having to study for a degree in electronic wizardry? If so, this article by Chris Gosling is for you. Basic circuit At its most basic all you need is: an LED of the size and colour you wanta battery (or other power supply)a resistorsome small gauge (thin) wire to connect it all together. Note that your power supply could be two or more batteries in a holder or even a power adapter with a DC output. You will also want to be able to switch the circuit on an off but at its simplest, this can be done by disconnecting the battery/supply. For tools you need: a low wattage soldering iron (15-25W)a pair of wire strippers/cutters.some Rosin Core Solder (NOT Acid Core!)
The following image (supplied by djconfirmed of Sci-Fi Lookout Tower fame) illustrates how it all goes together. Care and Feeding of LEDs Resistance is NOT Futile Heat is also generated by electricity and the more current that flows through something, the more heat it generates. If your LED is: