The H-25BLVN-30 from American High Voltage is a DC to DC Converter with Input Voltage 30 V, Output Voltage 1 1000 V, Output Current 1 0.3 mA, Output Power 1 W, Supply Voltage 27 to 33 V. Tags: Screw Mount, Buck/Step down. More details for H-25BLVN-30 can be seen below.