Tablet Reminder Uses Watch Module

Posted on Feb 5, 2014

This device is used as a reminder to take medicine every day. This device actually contains a crystal watch and a 4001 quad 2-input NOR gate with two of the gates (IC1a & IC1b) wired as an RS flipflop. The watch is set to tablet time , usually mornings, when an alarm is activated with a high signal fed via diode D1 which sets the RS flipflop and

Tablet Reminder Uses Watch Module
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enables the oscillator comprising gates IC1c & IC1d. This drives the LED with a 10% duty cycle. The 10nF capacitor resets the watch alarm when positive voltage appears on pin 3 of IC1. The circuit consumes only 50 µA with a 3V battery.

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