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Thetower55 asked What is the diffrence between triacs and transistors?
I am trying to build a circuit that uses a low power photo cell (3V) , to switch a light on running at 120 V AC
And got the following answer:
Keep in mind there are different types of transistors (FETS and BJT's). There are some very significant differences between transistors and triacs. Triacs are a type of thyristor. Triacs are always on or off. Transistors have an active region and can be partly on. Once triggered on Triacs stay on even when the trigger is removed (a triac stays on until the current throught the main terminals goes to zero). Transistors turn off if the controlling voltage and current is removed. Triacs are useful to turn AC loads on and off. Solid state relay's often incorporate a triac and a trigger/control circuits. Some solid state relays use two SCRs and some use power mosfets.