An electric guitar is as good as the amplifier that is connected to it. Without an it, the guitar is not very useful to play any music. Amplifier comes in many form and can be powerful enough to make a full stadium shake. Here, we will be building one of the smallest amp you can make: a jelly jar amp. You can find various examples of this amp online and you can even buy it already built or in a kit. But here, I will show you how you can make it on your own for a couple of bucks, with few tools and components.