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Common ground between two circuits

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choemanus

New Member
Howdy

I have built the 10 Channel Light Bulb Sequencer circuit from the projects section in the forums and the circuit part works perfect. I was lazy and used a wall transformer to supply 12 volt but then when i attempted to hook up the triacs it would not work. I think the problem is the ground. According to the schematics there has to be a common ground between the 12v and 115v circuits. This is my first electronics project and i do not have infinate knowledge so here is my question. Can i still connect ground between the two circuits or do i have to make my own power supply? Do i have to make sure that the 115v house outlet is wired properly (Neutral/Hot)? I don't want to blow up my 12v circuit that would be bad. :roll:

Oh yeah and the schematic is missing a connection from pin 16 to +12v on the 4017 IC - makes odd things happen if its not connected.

Thanks,
John
 

choemanus

New Member
OK well no one cares about my question :( so i said screw you guys and went ahead and put the ground in and it works perfect - parts are cheap anyway lol. Yay now time for great party lights :) Hmm.. still not sure about the physics of why it works and why it does not blow up the 12v circuit but thats alright don't matter.

Chow,
John
 
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