Junction diode : pn junction diode semiconductor diode characteristics apparatus with regulated power supplies objective : to study forward& reverse characteristics of pn junction diode. Features : instrument comprises of dc regulated power supplies 0-3vdc150ma & 0-30 vdc150ma, through selector switch. Two dual range square meters for voltage & current observations, two pn junction diodes mounted behind the panel for forward and reverse experiments, connections of supplies, meters & diodes brought out at 4, 5 mm sockets.