Connection problem

[Aan]

Which one should i connect C to A or C to B ? and why ?

 

[audioguru2]

Why are there two extra diodes connected to the AC? You don't want to connect AC to ground or to the output of the regulator.

Look on the datasheet for a 78xx regulator. It shows the two capacitors that are missing on your sketch.

Whay aren't your lines straight??

 

[Aan]

Well, i want to detect zero crossing, i need to know where point C to be connected to..

Whay aren't your lines straight??

Well, i was in hurry..

 

[audioguru2]

I think this circuit will detect each zero crossing of the mains: