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FOUR_LED_BCD_DISPLAY

2016-12-09 12:12  
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FOUR_LED_BCD_DISPLAY
Square-wave input pulses are counted by 7490 IC that drives LEDs indicating count in binary format up to 10 and then recycling Can be used for classroom demonstrations of counters,flip-flop action, and binary counting,Pulses can be obtained from UJT clock circuit operating at audio rate.-F M Mims, Computer Circuits for Experimenters, Radio Shack, Fort Worth, TX, 1974, p 85-93