Using the Fairchild FCM7001 circuit, which is equivalent to the Cal-TexCT7001 chip (which is not very easy to use), can drive six seven-segment LEDs that can be used to display 12-hour or 24-hour and 28/30/31-day calendars. The function of the alarm. The article will give a detailed structural diagram. Pins 3, 5, 10 and 12 of each SN75491 driver chip are connected to pin 11 via a 150 ohm resistor RL.
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