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Calendar clock circuit

2017-01-07 06:06  
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Calendar clock circuit
FCM CT7001 clock chip is produced by Fairchild, it can make 7 paragraphs LED of 6 bits display 12h or 24h, and it also has the functions of 28/30/31 calendar and alarm clock. ③, ⑤, ⑩, (12) of SN75491 driver chip are connected to (11) by a 150Ω resistance. Usually, RL is 2.7kΩ, it can limit the LED current below 5mA.