Cristal Radio

My computer doesn't freeze. It has Microsoft Windows XP operating sysyem.

You posted a very fuzzy JPG file type instead of a very clear GIF or PNG file type.

Your pic is a tiny thunbnail instead of a reasonable sized pic.
Your pic looks like this:

Sorry, this should work. 5.5 kb PNG

Did you make that extremely simple "radio"?
Does it receive many AM stations all at the same time?
Are strong local stations very loud and weak distant stations very low level?
Does it receive interference from everything electrical?
Doesn't AM radio sound awful?

I don't know, i need an amplifier to boost the output because i don't have a pizoelectric earphone.

One temporary way around this problem is to find an old stereo receiver that has a "Phono" input on the back. As a temporary measure, this will give you an easy-to-use amplifier that will drive 8 ohm headphones or speakers. It may seem silly to use a big receiver to help with a simple crystal radio but in our business it is quite common to replace sections of a circuit we are developing with off-the-shelf functional boxes so that we can concentrate on one thing at a time. The Phono input on an old stereo is usually a fairly high impedance and is very very sensitive, so it will interface directly with your crystal radio detector. Once you have the crystal detector working well, you can then get a simple audio amplifier kit such as this one to replace the stereo:

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or
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I recommend a kit like this for the beginner as you are more likely to get it working than if you build it from scratch.

Thanks, I'll try it. I will,(in the future) get a LM386 to drive it.