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The Calendar Clock Circuit

2017-01-08 19:02  
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The Calendar Clock Circuit
The FCM CT7001 clock chipis produced by the Fairchild company, and this device let the 6-digit & 7-segment LED display the time of 12h or 24h, and also has the function of 28/30/31 calendar and alarm. The (3)(5)(10)(12) of the SN74591 driver chip connect to (11) by a 150Ω resistor. Generally the RL is 2.7KΩ, it limits the LED current less than 5mA.