Abstract: This invention relates to a thermostatted oscillator comprising an assembly support constituted by a printed circuit provided with an opening, on the edge of which is fixed, at a reduced number of points, an electrically insulating secondary support on which are fixed, on the one hand, a piezo-electric resonator and, on the other hand, a prediffused circuit comprising in integrated form the essential elements of the electronic circuits for regulating the supply voltage of the assembly, of the electronic circuits for maintaining and amplifying the oscillations of the resonator, and of the electronic circuits for regulating the temperature of the resonator. The invention is more particularly applicable to miniature oscillators of high stability and low consumption.