Housing for electronic circuits. The housing is designed to deal with the problem caused by the fact that certain types of circuits are sensitive to acoustic vibrations of the housing and that some electronic components of the circuits need to be protected from the heat generated by other components in the housing. The housing includes a unitary die-cast (11) for enclosing electronic circuits within one or more compartments or cavities (13, 15) adapted to receive circuit boards therein. A cavity (15) includes a post (23) centrally located in the bottom and extending upwardly in the middle of the cavity. A fastening device, such as a screw (37), is used to forcibly affix a rigid but flexible cover (31) onto the housing at the center post. The cast and the cover are made of electrically conductive but acoustically dampening material. When the cover is forcibly affixed to cover the cavity, the cover and the chassis provide an acoustically and microphonically dampened housing for the circuit placed therein. The cast includes a wall (51) separating the compartments, and the wall has a cavity (53) along the length thereof and substantially co-extensive therewith for providing a thermal separation between the compartments whereby the wall acts as a thermal insulator.