The present invention generally relates to manufacturing electric volatile substance evaporators for evaporating aromatic substances and/or insecticides for example and the invention more specifically allows the modular construction of these types of devices such that based on a basic evaporator, a manufacturer of electric evaporators can incorporate additional elements to the device in order to produce different types of evaporators without altering the basic evaporator design, where the module comprises a casing having a first surface configured to be assembled with a volatile substance evaporator and internally carries an electric device intended to cooperate in the operation of the evaporator.