Circuito 74LS90 Contador

flux

No pude modificar el proyecto porque no hay créditos disponibles para ejecutar cambios en el esquemático.
Sobre tu circuito con el 74LS90 contador decimal 0–9, la idea general es correcta, pero hay un detalle importante:
  • El pin 14 es la entrada de reloj para la primera etapa.
  • El pin 12 es la salida QA.
  • Para que el 74LS90 cuente de 0 a 9, normalmente se conecta:
Text
Pin 12 / QA  ---> Pin 1 / CP1
Eso coincide con tu conexión:
Text
Pin12 ---------+
               |
Pin1 <---------+
La alimentación también está bien:
Text
Pin 5  ---> +5V
Pin 10 ---> GND
Y los pines de reset/control normalmente deben mantenerse en bajo para contar normalmente:
Text
Pins 2, 3, 6, 7 ---> GND
El pin 13 depende del encapsulado/modelo exacto, pero en muchos esquemas del 74LS90 se deja sin conexión o se trata como NC. Conectarlo a GND puede no ser necesario; conviene verificarlo con el datasheet específico del 74LS90 que estés usando.
Una versión ordenada del circuito sería:
Text
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
Recomendación importante: agrega un capacitor de desacoplo de 100 nF entre +5V y GND, lo más cerca posible del 74LS90:
Text
+5V --- 100nF --- GND
También sería mejor agregar antirrebote al pulsador, porque un pulsador mecánico puede generar varios pulsos falsos y el contador puede avanzar más de una cuenta por pulsación.
Agregar desacoplo
Antirrebote pulsador
Revisar pin 13
Netlist simple
Revisar ERC/DRC
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