Diode Pack - 1N4001, 1N34A (Germanium), and 1N4148 (10pc) A Rectifier Diode is a semiconductor device that converts alternating current into direct current, used as voltage references and as shunt.Best for Learning Electronics and DI Y Projects and widely used in product development, student experiments, maintenance, production, etc Pack Includes: 5pcs 1N4001 Rectifier Diodes 5pcs 1N4148 Rectifier Diodes 1pc 1N34A Germanium Diode