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[SOLVED] Problem in analyzing circuit relay's

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MyMelon

MyMelon

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i'm a hobbyist and a beginner in electronic components. i have a circuit and trying to figure it out. i checked the connection in the circuit board and it looks like this.

https://imageshack.us/photo/my-images/834/relay.png/

i am confused, with the first image there is 12v power source which is connected in relay ,. with the second image(right part of the drawing)
there is no 12v connected. btw i forgot to put a connection to the bulb which is connected to the AC power source.

please help. i want to build a clean circuit and i want to use in my future projects. the previous circuit is very messy:-|
 

I can't see what's going on in the second picture, but the light bulb needs to be connected like this.

---------- Post added at 15:21 ---------- Previous post was at 15:17 ----------

 

Oops. Yes I suppose so.
That's a little scary. Wiring mistake + mains = dead people.

Anyway, if it's for mains, then it should be wired like this.

 

1.JPG

there is 8 relays which is connected to 8 pins of mcu. when the coil energize the relay will go to NO state and the bulb will light up because of the 220v AC
but can't find in the circuit where they connected the 12v :|..

is this possible?
2.JPG
 

But the circuit is working without the 12v connection

---------- Post added at 00:20 ---------- Previous post was at 00:11 ----------

i'm a noob building a circuit. but my conclusion is can be the 220v AC will give current to the relay to put it in NO state or if the relay can handle that supply coming from AC?
 

+12V must be connected to the relay circuit. The relay can not work with no 12V connection.
 
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