This is a crystal radio amplifier for amplifying the output to a crystal earphone or telephone receiver earphone. It uses a single transistor and is very simple to make. This circuit is by Charles Wenzel and originated from his website here.
If you did want to try making the above circuit on a breadboard as in the above photo, then the following is a diagram showing how I arranged all the parts. The videos below use this same arrangement.
The following are two construction videos of the making of this amplifier.
This first one includes:
This second one shows every step of putting the circuit together on the breadboard and then connecting it to the crystal radio.