⚡ Proyecto con temporizador biestable con el NE555 y arranque de motor electrico SR con SET y RESET

Summary

In this video, the presenter demonstrates how to use an NE55 timer IC for creating a relay control system with set and reset logic signals, similar to a PLC setup. The circuit uses a 5V voltage regulator, with the NE55 chip controlling a relay via TTL signals. The tutorial covers circuit components, including diodes, resistors, and transistors, and explores options for adapting the design to AC loads using an optocoupler and triac. Additionally, the presenter provides instructions for replicating the PCB design using thermal transfer and protecting the circuit from oxidation.

Takeaways

• 🔧 The NE55 timer chip can function as an SR latch in PLC programming, allowing for flexible control signals.
• ⚡ A simple circuit design includes a 5V voltage regulator, diodes, resistors, and LEDs for indicating power status.
• 🛠️ The circuit utilizes two control signals: one for setting (set) and one for resetting (reset) the output.
• 💡 The design allows for triggering outputs using a high logical signal for 'set' and a low logical signal for 'reset.'
• 🔄 An internal block configuration for 'set' and 'reset' enhances the functionality of the NE55 timer.
• 🔌 The output can directly drive a relay, providing a practical application for automation.
• 🌐 The circuit can also be adapted to use an optocoupler for controlling AC loads, making it versatile.
• 🏭 The design is suitable for assembly in electrical panels, accommodating both AC and low-power applications.
• 📑 Users can replicate the PCB design provided in the video by printing it at a 1:1 scale using toner transfer methods.
• 🎨 A protective spray finish is recommended to prevent oxidation of the circuit over time after assembly.

Q & A

What is the main focus of the video?

The video focuses on demonstrating how to use a timer with the NE55 chip, highlighting its advantages in programming and automation in PLCs.

What does the configuration of the NE55 allow in terms of control signals?

The configuration allows for two control signals: one to set the timer and another to reset it, regardless of the time being managed.

How does the circuit begin, and what components are involved?

The circuit begins with a 5-volt voltage regulator, along with a diode, resistors, and an LED indicating power. It includes capacitors for input and output filtering.

What is the function of pin 3 on the NE55 chip?

Pin 3 serves as the output; it is activated by a high logic level when the set control signal is received.

How does the reset function operate in this circuit?

The reset function operates by providing a ground connection to the reset pin, which sets the output to a low logic level.

What is a recommended alternative to using a relay for controlling outputs?

An alternative to using a relay is to employ an optocoupler to activate a triac, allowing for control of AC loads.

What considerations should be taken for inductive loads in this setup?

For inductive loads, it is recommended to use an RC filter to protect the circuit from voltage spikes.

Can the power supply be modified for this circuit, and if so, how?

Yes, the power supply can be modified to use a capacitive source instead of a regulator since the circuit does not require much current.

What special component is mentioned for ensuring proper connections on the PCB?

A jumper must be placed at the top of the 7805 voltage regulator to ensure proper connections, as indicated in the video.

What finishing technique is described for the PCB to prevent oxidation?

The presenter uses a spray varnish for electrical motors to coat the PCB, protecting the tracks from oxidation after cleaning with isopropyl alcohol.