A device for cooling electric or electronic devices includes a heat exchanger and a adapter means connected to the heat exchanger via a fluid line for connecting the heat exchanger to the electric or electronic device. An outer surface of the first vertical wall portion is an inclined surface that is inclined to the second vertical wall portion, and one of an outer surface of the first vertical wall portion and an inner surface of the second vertical wall portion includes a protrusion portion that protrudes toward the other. The control circuitry includes at least one surface mounted component, to control a switching device to couple a source of DC power to a primary of the switching transformer at a switching frequency.