Abstract: A current pulse producing, current regulating circuit includes a SCR arranged to pass a current pulse once each positive going half wave input supplied thereto. The SCR is controlled by a control circuit free of current feedback and timing circuitry and responsive to the an unfiltered, rectified A.C. input. The control circuit produces a firing signal, which is applied to the control electrode of the SCR, at a point during the downward swing of each positive going half wave input. The control circuit includes a OR function circuit responsive to the unfiltered rectified input applied to the control circuit and to an output from a circuit also responsive to the unfiltered rectified input; the last mentioned circuit having a hysteresis characteristic. The SCR may be operatively associated with a second SCR and arranged to fire it thereby producing higher amplitude current pulses. Battery charging and forming circuits, as well as off-line power supplies, incorporating the current regulating circuit are disclosed.