1 how to intail a house having two bulbs controlled by four switches?
2 how can i use a two switches for a bell and two bulbs?
2.how voltage comparater works?

 

1. Use 4 four-way switches.

2. One switch to the bell, the other to the bulbs.

3. http://www.allaboutcircuits.com/vol_3/chpt_8/5.html.

 

For 1:

http://www.handymanwire.com/articles/3wayswitch.html

http://www.wonderquest.com/3-way-switch.htm

 

1 how to intail a house having two bulbs controlled by four switches?

Is that two three-ways, or one five-way? (And is there even such a thing as a five-way switch?) Or is it a four-way with an over-ride? Or a three-way with two over-rides?