COMO HACER reloj DIGITAL - con(74LS90 Y 74LS47)
Digital Clock Assembly Tutorial
Introduction to the Project
- Omar introduces himself and outlines the project: assembling a digital clock using integrated devices such as 74LS47, 74LS90, logic gates, buttons, and a timer.
- The project will be demonstrated step-by-step with a schematic provided in the video description.
Initial Setup
- Four protobars are used; blue indicates negative circulation while orange indicates positive.
- The assembly begins with placing six 74LS90 integrated circuits followed by six common anode displays.
Connections for Integrated Circuits
- Connections are made starting from the 7490 to the 7447 and then to the display. Specific pin connections include:
- Pin 5 of the display connected to positive.
- Pins 6 and 7 connected together to negative.
- Further connections involve linking various pins between the integrated circuits and displays, ensuring proper functionality.
Replicating Connections
- The same connections are replicated across additional rows of components for uniformity in setup.
Timer Assembly
- A timer is assembled using a 555 chip along with a potentiometer. Key connections include:
- Pins connected to positive/negative as per standard configurations.
- A capacitor is introduced into the circuit for signal enhancement, connecting it appropriately within the timer setup.
Testing Signal Functionality
- A test is conducted using a power supply of five volts; improvements are made by adding a capacitor to reduce noise in the project.
Finalizing Circuit Connections
- Additional connections are established between integrated circuits to ensure signals flow correctly through each component involved in timekeeping functions.
Logic Gate Integration
- An integrated circuit (74LS08 logic gate) is added; specific pin connections facilitate signal processing necessary for minute adjustments via buttons.
Button Configuration for Time Adjustment
- Two buttons are configured: one for minutes and another for hours. Each button connects positively while also linking back into their respective integrated circuits for functionality.
This structured approach provides clarity on how each component interacts within this digital clock assembly process.