Ever wish you could build an “audio telescope” that would let you hear things that were faint or far away? Well, this article shows you how to build such a thing. We call it the Big Ear.
The Big Ear is shown in Figure 1. Its most obvious feature is its parabolic dish reflector. The reflector concentrates sound energy onto a microphone that connects to a very high gain amplifier (see sidebar on parabolic reflectors). And believe it or not, it’s all assembled on a wood base you can find in a place that sells concrete supplies and tools! More about the wood base later; first we’ll discuss the amplifier..... Click here to read the rest of the article