Battery-powered alarm clock - has battery connected by controller to gating system and sounds alarm when battery is exhausted

摘要

The electronic alarm clock includes an oscillator unit (1) controlled by a quartz element (2). A divider circuit (3) connected to the driver stage (4) for the stepping motor (5) for the hands (7) of the clock. The divider is connected to a switch by a programmer (10) and an OR gate (14) and AND gate (15) to operate an audible alarm (17) with an oscillating signal. The battery (18) is connected to a control circuit (19) followed by an OR gate (20) and an inverter (16) in parallel with an AND stage (21) so that when the battery is nearly exhausted, the output signal from a junction (12) in the divider is fed to the driver (13) preceding the audible alarm, resulting in a constant warning signal. The reset switch (22) is connected between the battery controller (19) and the OR gate.