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Trust Daburn Electronics and Polytron Devices for your DC-DC converter power supplies needs. You will benefit from 50 years of power supply experience. Nearly all of our power supplies are UL approved. We are also an ISO 9001 and AS9100 quality system certified supplier. Our linear power supplies, used in various military sectors, meet all relevant MIL-STD-810F standards for use in military applications. They have passed a series of required tests that check for their ability to withstand extreme temperatures, high altitude, vibration and mechanical shock.