Digital alarm clock circuit diagram

U1 is the 3817 integrated circuit, capable of directly driving the display. It can show time in either 12-hour or 24-hour format, schedule alarm sounds, and automatically turn on the radio at specified times. The display utilizes the FND500 light-emitting diode, with an input frequency of either 50Hz or 60Hz. U2 is a 7800 series voltage regulator, designed to provide adequate power for the radio.

The circuit utilizes the 3817 integrated circuit (IC), which serves as the primary controller for the timekeeping and alarm functions. This IC can be configured to operate in either a 12-hour or 24-hour format, providing flexibility for user preferences. It interfaces directly with the FND500 LED display, which visually represents the current time and alarm status. The display operates efficiently at standard input frequencies of 50Hz or 60Hz, making it suitable for various geographical locations.

The alarm functionality is a key feature, allowing users to set specific times for alerts. This is managed by the internal clock of the 3817, which can trigger audio signals or activate other devices such as a radio. The integration of the radio function adds versatility, enabling the user to wake up to their preferred station.

Power management in the circuit is handled by the 7800 series voltage regulator (U2). This component is essential for maintaining a stable voltage supply to the 3817 IC and the radio, ensuring reliable operation. The 7800 series is known for its robustness and ability to handle varying loads, making it ideal for this application.

The overall design emphasizes efficiency and user-friendliness, with a straightforward interface for setting the time and alarms. The use of LED technology in the display ensures low power consumption while providing clear visibility. This circuit can be employed in various applications, including alarm clocks and timers, making it a versatile solution for timekeeping and alerting needs.U1 is the 3817 integrated circuit. It has the ability to drive the display directly, and it can display 12h or 24h, schedule alarm sounds, timely and automatically turn on the radio. Display is FND500 light-emitting diode, the input frequency is 50H or 60Hz. U2 is the 7800 series regulator, its rated power can meet the requirements of the radio. Users can se.. 🔗 External reference