The “Light Bulb Power and Magnets” page features a few cool techniques that you can use to power light bulbs and other electronics.
To turn on a light bulb you will first need to attach a magnet and wire to the back of the bulb. The reason why I didn’t start explaining how to wire all the things on this page is because these are really easy and if you don’t understand what each individual pin does then I promise you you are at the wrong place 🙂
For some basic operation of a light bulb, you can connect the wire to a resistor with a setting that puts out about 200-300V. This will give you a signal that will tell the light bulb which way to turn when the voltage changes.
If you want to use a low voltage supply, you can use a resistor with a setting that puts out less than 200-300V. If it isn’t a low voltage you can connect a 3-wire jumper wire across the two pins. In this case, you will only see a very weak signal when you power the light bulb via power from your computer.
You can then power the light bulb by adding several of the wires to the resistor. If your computer is a few years old you may have to adjust the resistor setting.
This will give your light bulb more power. If you have many components that connect to the back of the light bulb, then this can be hard to adjust. If you have one of these computer projects all working at once, then having this pin adjusted for your computer will make life easier.
The final stage I like to do is put the two power wires together to make one long cable, which is what we will use to power all sorts of objects on a desk. If you are using a desk lamp, you may want to wrap the lamp itself so it can be safely powered as well.
Light bulbs will be powered with the power pin from the computer, wires from your desk lights, wires from laptops, and power from other electrical devices. For other applications you also want to have some way to get power back to the computer when you aren’t using it. This is where the power strip comes in.
Light Bulbs and Power Strip
The power strip on a laptop monitor is a nice thing, but it isn’t as neat as this. Instead it uses two standard wall batteries (which are about the size as a piece of string), and then they slide through holes in the screen back.
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