VARIABLE VOLTAGE/CURRENT SWITCHING POWER SUPPLY MODULE A high quality selfcontained module based on ST Microelectronics GS-R400V power DC/DC Converter. Input voltage 30VAC(28~31) 4A through conventional/toroid mains transformer. Output voltage adjusted from 0.8 V to 30 Volts Load current adjustable from 0mA to 4A Crowbar protection.short circuit protection,thermal protection Regulation: Line : 6mV/V Load : 20~90 mV/A Output ripple : 25~100 mV pp. Very compact Eurocard size,16X10X3,5cm This unit is based on ST Microelectronics GS-R400V DC/DC Converter module Made of high quality materials,like double sided pth pc board,high temp./current capacitors. This is a trusted power supply module used for years in industrial environmental conditions with excellent results.With a common ,easily found off the shielf toroidal transformer will create a high quality general purpose power supply,its secondary should be 30V(2X15V) 160VA. A brief description is included with all necessary for its use,wiring ,peripheral items like voltmeter/ammeter to be connected withAlso its detailed electronic diagram..