Abstract: The present invention concerns an electronic voltage regulating device applied to electrical appliances, and more particularly, arc welding equipment comprising a voltage regulating portion having two SCRs alternately turned on and off by a controlling portion having a RC circuit, a DIAC and a TRIAC which is operationally characterized by the DIAC being triggered during each half cycle when the capacitor is charged to a predetermined potential by the application of alternating current, the DIAC then triggering the TRIAC, which in turn enables the gate of one of the two SCRs in each half cycle to turn the SCR on and allow current to pass through the load for the remainder of the half cycle, thus controlling the operable power by means of controlling the conducting phase angle through the adjustment of the RC value or the choice of the DIAC.