Abstract: AC-DC voltage regulation is achieved utilizing, among other components, a series pass control element which is serially connected to a detector and filter output stage and between circuit input terminals and an output load. A rectified input voltage is applied to the series pass control element which controls the required amount of current flowing into a load every 1/2 cycle of the input signal. This current is, in turn, detected and filtered to provide the regulated DC output voltage. A voltage sensor is connected to the output of the series pass control element and in parallel with the detector and filter stage; this sensor breaks down at a predetermined level of series pass voltage to, in turn, generate a feedback control voltage. This control voltage is fed back to a current controlled switch which is connected in shunt with the series pass control element.