Ultravolt 1/2A12-P4-25PPM-F-M-C Non-Isolated / PoL A-Series DC to HVDC Converter, Single output (Unipolar), +12V Input, , +500V DC HVout, 4W, Thru-hole mount, Regulated, Standard Interface, 25ppm/ C Temperature Coefficient, Ripple reduction filter, Mu Metal shield, Aluminum Case