A two-wire electronic switch adapted to be coupled between an AC power source and an electrical load for turning the electrical load on and off, the electronic switch comprising: a controllably conductive device adapted to be coupled in series electrical connection between the source and the load, the controllably conductive device adapted to conduct a load current through the load when the controllably conductive device is conductive; a controller operatively coupled to the controllably conductive device for controlling the controllably conductive device to be conductive and non-conductive to turn the load on and off, respectively; and an output capacitor (C OUT) operable to develop to a DC supply voltage for powering the controller; characterized by an in-line power supply coupled in series with the controllably conductive device, the in-line power supply further coupled to the output capacitor for controlling when the output capacitor conducts pulses of charging current in order to generate the DC supply voltage across the output capacitor when the controllably conductive device is conductive, a voltage developed across the in-line power supply when the output capacitor is charging having a substantially small magnitude as compared to a peak voltage of an AC line voltage of the AC power source, the power supply comprising two FETs (Q312, Q314) in anti-series connection, the anti-series-connected FETs coupled in series with the controllably conductive device and in parallel with the output capacitor, such that the output capacitor is adapted to conduct the load current for at least a portion of a line cycle of the AC power source when the controllably conductive device is conductive and the anti-series-connected FETs are non-conductive; wherein the power supply starts and stops charging the output capacitor at least once during each half cycle of the AC power source, such that a frequency of the pulses of the charging current conducted through the output capacitor is greater than twice the frequency of the AC power source. a controllably conductive device adapted to be coupled in series electrical connection between the source and the load, the controllably conductive device adapted to conduct a load current through the load when the controllably conductive device is conductive; a controller operatively coupled to the controllably conductive device for controlling the controllably conductive device to be conductive and non-conductive to turn the load on and off, respectively; and an output capacitor (C OUT) operable to develop to a DC supply voltage for powering the controller; characterized by an in-line power supply coupled in series with the controllably conductive device, the in-line power supply further coupled to the output capacitor for controlling when the output capacitor conducts pulses of charging current in order to generate the DC supply voltage across the output capacitor when the controllably conductive device is conductive, a voltage developed across the in-line power supply when the output capacitor is charging having a substantially small magnitude as compared to a peak voltage of an AC line voltage of the AC power source, the power supply comprising two FETs (Q312, Q314) in anti-series connection, the anti-series-connected FETs coupled in series with the controllably conductive device and in parallel with the output capacitor, such that the output capacitor is adapted to conduct the load current for at least a portion of a line cycle of the AC power source when the controllably conductive device is conductive and the anti-series-connected FETs are non-conductive; wherein the power supply starts and stops charging the output capacitor at least once during each half cycle of the AC power source, such that a frequency of the pulses of the charging current conducted through the output capacitor is greater than twice the frequency of the AC power source.