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Tablet Reminder Uses Watch Module(1N914)

2017-08-11 06:01  
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This article briefly describes the Tablet Reminder Uses Watch Module (1N914). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, you can better grasp this principle. In this circuit, you can learn about and purchase these components: 1N914.

This device is used as a reminder to take medicine every day. This device actually contains a crystal watch and a 4001 quad 2-inputNORgate 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 enables the oscillator comprising gates IC1c & IC1d. This drives theLEDwith a 10% duty cycle. The 10nF capacitor resets the watch alarm when positive voltage appears on pin 3 of IC1. The circuit consumes only 50μA with a 3V battery.

Figure:1 Tablet Reminder Circuit Diagram

Figure 1 Tablet Reminder Circuit Diagram



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