Circuito 74LS90 Contador
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Pin 12 / QA ---> Pin 1 / CP1
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Pin12 ---------+ | Pin1 <---------+
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Pin 5 ---> +5V Pin 10 ---> GND
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Pins 2, 3, 6, 7 ---> GND
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74LS90 contador decimal 0-9 Alimentación: Pin 5 ---> +5V Pin 10 ---> GND Reloj: +5V | Pulsador | Pin 14 | 1k | GND Conexión para modo década: Pin 12 / QA ---> Pin 1 / CP1 Salidas a LEDs: Pin 12 / QA ---> 1k ---> LED1 ---> GND Pin 9 / QB ---> 1k ---> LED2 ---> GND Pin 8 / QC ---> 1k ---> LED3 ---> GND Pin 11 / QD ---> 1k ---> LED4 ---> GND Reset/control: Pin 2 ---> GND Pin 3 ---> GND Pin 6 ---> GND Pin 7 ---> GND
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+5V --- 100nF --- GND
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