OT:Switching line voltages

[Plinio Barraza]

Hi I know its OT but I was hoping someone might 
help:

How can I switch a line voltage (110V60Hz) with 
a small controll voltage.  

At first I thought RELAY, but I don't want to 
have to use a transformer or AC controll signal 
(it does have to be ac right?).

Can this be done with power transistors?

Basically, How do they switch those digital pl
uggin timers?

Thanks in advance for your help?

Plinio 


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