Agilent HSMS-2820 Schottky diode and the 1N34 Germanium diode. The Agilent Schottky diodes were the diodes used in the previous project that was able to get the cellular phone battery to charge. The HSMS-282x series comes in many flavors contained within either a three or four pin package. They are described by Agilent as being good components for RF mixer/detector circuits