I’m trying to build a circuit based on the picture, and I managed to get what’s shown in the image working. The point I want to achieve is that when I press the NO button, the relay coil engages, and after releasing the NO button, the relay coil remains active, and only pressing the NC button interrupts the process. This also works, but I connected an LED to the branch where the NC button is, and the issue is that when I press the NO button again, the LED doesn’t light up until I release it, and once I release it, it lights up again. The relay coil stays engaged, that’s not the problem. Why is this happening? How can I make the LED stay on? I’m still a beginner, and I would appreciate it if someone could help and explain.

 

Your picture isn't clear, I suspect it might not be accurate. Can you redraw it clearer, and include the LED?

 

I connected an LED to the branch where the NC button is

Unclear/ambiguous Show us the connections of the LED. What limits the LED current?
Welcome to AAC!

 

and I would appreciate it if someone could help and explain.

Do you want the LED ON only when the relay is ON?

 

I’m trying to build a circuit based on the picture, and I managed to get what’s shown in the image working. The point I want to achieve is that when I press the NO button, the relay coil engages, and after releasing the NO button, the relay coil remains active, and only pressing the NC button interrupts the process. This also works, but I connected an LED to the branch where the NC button is, and the issue is that when I press the NO button again, the LED doesn’t light up until I release it, and once I release it, it lights up again. The relay coil stays engaged, that’s not the problem. Why is this happening? How can I make the LED stay on? I’m still a beginner, and I would appreciate it if someone could help and explain.

It's impossible to tell how you are actually connecting the LED and also what, if any, current-limiting resistor is being used.

Please post a complete schematic that includes this information and we can very likely help you spot the issue.

 

Try This way.

 

Unclear/ambiguous Show us the connections of the LED. What limits the LED current?
Welcome to AAC!

 

It's impossible to tell how you are actually connecting the LED and also what, if any, current-limiting resistor is being used.

Please post a complete schematic that includes this information and we can very likely help you spot the issue.

 

What current does the relay coil require to hold the contacts closed ? What is the current through the relay coil when the NO contact is closed ? Answering those two questions should give you an understanding of why it does not work.

Les.

 

Try this configuration.

 

Your connection of the relay coil in series with the LED requires that the relay coil current equals the LED current, and that the supply voltage is divided between the LED drop, the resistor drop, and the relay coil drop.
Do you see why that causes your problem?

 

You don't need to post the same thing multiple times, it just clutters the thread making it harder for people to navigate -- everyone reading the thread sees everything you post, not just the person you are responding to.

After you press the NO button to engage the solenoid, your circuit looks like the following:


All of the red wires are the same node, so notice that you have 5 V on both sides of your resistor/diode combination.

Also, I think you'll find that your battery (or whatever DC power source you are using) is connected the other way.

Another problem is that you are forcing the LED and the coil to have the same current. Unless you have carefully considered how compatible they are, you are being lucky that it works at all.

You want to put the resistor/diode combination in parallel with the coil so that any time the coil is energized, there is also the same voltage across the indicator circuit, but each component can draw whatever current it needs without affecting the other (assuming the power supply can adequately feed both at the same time).

 

Thank you very much to everyone who helped me; I managed to understand what the problem was and why the circuit didn’t work as I intended. I was able to fix it, so thank you again!

 

The TS was only telling us where one lead from the LED was connected. This is the classic case of the TS only providing the information that they have decided is all that we need. Several times the rest of the question was asked and not answered.

 

The TS was only telling us where one lead from the LED was connected. This is the classic case of the TS only providing the information that they have decided is all that we need. Several times the rest of the question was asked and not answered.

Let's be fair here -- the TS provided the requested information 50 minutes after the first request for it and barely an hour after their first post. That's pretty darn responsive. How long after their initial post was it before they even checked for a response? How long did it take them to prepare an updated diagram after they saw what was being asked for?

If everyone that was asked for additional information responded as quickly as this TS, life would be a LOT simpler around here!