Battery-operated quartz-oscillator alarm clock - has subsidiary frequency divider with alarm signal control circuit

摘要

The battery-operated quartz-oscillator alarm clock has the pulses from the quartz oscillator circuit (10) supplied to a frequency divider chain (14), connected to an electromechanical drive (20, 22) for operating the clock hands. An alarm signal control circuit (26) including an alarm switch (40) is connected between an alarm signal source (18) and an audio alarm. The alarm signal control circuit (26) is associated with a subsidiary frequency divider chain controlled from the main frequency divider chain (14), for obtaining an audio signal. At least three stages of the subsidiary frequency divider chain are coupled with the alarm signal source (18) via a logic AND gate.