The 1 Transistor Amplifier boosts the crystal radio amplification 10db to 20db. It uses a small ceramic capacitor (used 102 OHM), a 2sn (used 2N3707)type transistor, a 470k and a 47k ohms resistor; a 9 volt battery, and a crystal earplug. The input leads of the 1 Transistor Amplifier are connected to the Crystal Radio crystal earplug terminals on the Breadboard Socket, and the crystal earplug is connected to the 1 transistor Amplifier. When the radio reception is weak you still can hear many radio stations, when the 1 Transistor Amplifier is connected to the crystal radio.
Crystal Radios for the Shortwave Bands
Crystal Radio 1 Transistor Amplifier Circuit