Low DC voltage and/or AC voltage powered compact machine for preparing espresso coffee or other infused beverages and of stationary type or transportable on different positions and places, adapted to be installed into means for inhabited uses, campers, caravans, motor-homes, different kinds of boats, commercial and industrial vehicles, comprising a box-like cabinet enclosing a support structure provided with heat exchanger means provided with electric heating elements with reduced energetic consumption for heating water for preparing the infused beverages, pumping means for sucking water for preparing the infused beverages, which is contained into at least a container and conveying it toward said heat exchanger means, thermostatic control means (61, 62) of the heating temperature of said heating elements and therefore the temperature of water, which are connected into an electric supply circuit, supplied with low DC voltage by means of supply cable (s) or a battery, said support structure being also provided with at least a filtering and delivering unit (52, 53; 44; 49; 50) of the prepared infused beverage, communicating with said heat exchanger and capable to deliver the infused beverage into an underlying receptacle, and electronic control means (electronic card) operable by selector means (13, 14, 15) for controlling the different electric and electronic component parts of the machine and for setting the operative cycles of the machine, characterized by valve means communicating through respective conduits (63, 64, 65; 66, 64) with said container, which is housed into a separate cavity of said support structure, and said heat exchanger means, for sucking water from said container and conveying it toward said heat exchanger means, as well as for discharging water in the interior of said container when the delivery of the infused beverage is ended, and characterized by low DC voltage powered electronic regulation means, connected in the machine electric supply circuit, which are adapted to stop the machine operation if the level of the battery supply voltage lowers below a determinate value, and characterized in that said filtering and delivering unit is constituted by an upper stationary portion (cylindrical head 52 with valve means 53) communicating with said heat exchanger means, and by a lower movable portion formed by a filter supporting body, the upper part of which is shaped for housing a correspondent thin cup, acting as support for the capsule containing the metered and pressed powder of the relative beverage to be prepared, or a filter for receiving the loose powder of the beverage to be prepared, or a filter for receiving the paper waffle, said filter supporting body being joined at its lower part to sliding means (movable saddle 32), which can be actuated by transmission means (35, 11) and adapted to slide vertically from a lowered position thereof, spaced away with respect to said upper stationary portion (52, 53), in which into said filter support one of the elements for preparing the beverage is introduced, to a raised position thereof, arranged near said upper stationary portion (52, 53), in which hot water is passed through the element for preparing the beverage, and from such raised position it is slid again in the lowered position thereof, so as to discharge the exhausted element for preparing the beverage from the same filter support.