What is the approximate forward threshold voltage of a germanium diode?

A diode allows current to flow in one direction, but it requires a minimum voltage to overcome its internal barrier before that current can start flowing. This is known as the forward threshold voltage or forward voltage drop. For a diode made of germanium, this forward threshold is approximately 0.3 volts. This low voltage drop makes germanium diodes excellent for detecting very weak radio frequency (RF) signals, such as in early crystal radios. By contrast, standard silicon diodes have a forward threshold of approximately 0.7 volts. Remembering the difference between these two semiconductor materials is a crucial step in understanding basic circuit design.