Electrical power supply device comprising a first input terminal (IN1) and a second input terminal (IN2) between which an AC input voltage (Vin) may be applied, including: - a rectifier (D6) that is connected in series to the second input terminal (IN2); - an oscillator (OSC) that is connected to the first input terminal and the rectifier (D6), said oscillator (OSC) including: - a DIAC-type diode (DIAC) that is connected both to a connection point connecting a first resistor (R1) to a first capacitor (C1) and to a second capacitor (C2), said second capacitor (C2) being connected to a first downstream terminal (Y1); - a resistor (R3) that is connected between the connection point between the DIAC-type diode (DIAC) and the second capacitor (C2) and a second downstream terminal (Y2); - a voltage converter (CONV), which is connected to the first downstream terminal (Y1) so as to be controlled by control pulses that are generated by said oscillator (OSC) in order to generate electric current pulses and which is arranged to deliver a DC output voltage (Vout) on the basis of the voltage between the first input terminal (IN1) and the rectifier (D6) by generating said electric current pulses; - the oscillator (OSC) being arranged to deliver said control pulses, the amplitude of which is limited to below a voltage threshold value by the DIAC-type diode; - the first capacitor (C1) having a capacitance the value of which determines the number of control pulses on each alternation of the AC input voltage; - the second capacitor (C2) having a capacitance the value of which determines the duration of each generated control pulse. - a rectifier (D6) that is connected in series to the second input terminal (IN2); - an oscillator (OSC) that is connected to the first input terminal and the rectifier (D6), said oscillator (OSC) including: - a DIAC-type diode (DIAC) that is connected both to a connection point connecting a first resistor (R1) to a first capacitor (C1) and to a second capacitor (C2), said second capacitor (C2) being connected to a first downstream terminal (Y1); - a resistor (R3) that is connected between the connection point between the DIAC-type diode (DIAC) and the second capacitor (C2) and a second downstream terminal (Y2); - a DIAC-type diode (DIAC) that is connected both to a connection point connecting a first resistor (R1) to a first capacitor (C1) and to a second capacitor (C2), said second capacitor (C2) being connected to a first downstream terminal (Y1); - a resistor (R3) that is connected between the connection point between the DIAC-type diode (DIAC) and the second capacitor (C2) and a second downstream terminal (Y2); - a voltage converter (CONV), which is connected to the first downstream terminal (Y1) so as to be controlled by control pulses that are generated by said oscillator (OSC) in order to generate electric current pulses and which is arranged to deliver a DC output voltage (Vout) on the basis of the voltage between the first input terminal (IN1) and the rectifier (D6) by generating said electric current pulses; - the oscillator (OSC) being arranged to deliver said control pulses, the amplitude of which is limited to below a voltage threshold value by the DIAC-type diode; - the first capacitor (C1) having a capacitance the value of which determines the number of control pulses on each alternation of the AC input voltage; - the second capacitor (C2) having a capacitance the value of which determines the duration of each generated control pulse. <EOS>