Abstract: A microprocessor-based clock which has both a current time digital display and an alarm time digital display, as well as controls for setting both the current time and the alarm time either ahead or backward at selectable rates such that a single knob provides rapid setting of the setting time and a single knob provides rapid setting of the alarm time. An improved regulating circuit provides the microprocessor with a first substantially constant DC voltage and a second DC voltage limited to a given magnitude. User-accessable controls are provided for effecting a snooze alarm function, alarm setting and for disarming the alarm function for a relatively long period of time, e.g., for 24 hours. One of the controls includes strips bridgable by a conductive member such as a finger.