Electrical – How to wire 220v to 1 ch relay

It seems that:

• when the LED dims, current is flowing through the coil and then through the LED. Because the coil allow low current to flow through it, you see low brightness into your LED.
• when the relay clicks again an high voltage is produced on the coil and the LED, then you see an high brightness in your LED. This is interesting if you are a novice because you can see your LED doing the function that, in the original circuit, would be performed by flyback diode.

Solution:

• flip your relay left-right

Ignore pin 4, that's the normally closed contact. It's that simple. Note that the diagram is looking at the bottom of the part, not from the top through it.

1 and 3 are the switch that closes when the coil is energized, it doesn't matter which is which, and they go to the keyboard.

2 and 5 are the coil.. again it doesn't matter which is which.

Test it out before hooking it up to the keyboard- you should hear the relay clacking as it operates with the "tumbler switch".

When you do hook it up, keep the connections neat, shorts kill parts.