I want to switch 220V AC with a microcontroller. Before I used magnetic relays or SSR relays, but now I want to use a triac for this function (like in this circuit) and my load can be any 220 V AC object. The reason is, triacs are cheaper, smaller and have more ability for high currents than magnetic or SSR relays.
1) Please guide me at the choice between magnetic relay, SSR and triac.
2) Someone told me that triacs for switching AC current creates noise. Is this correct? And what is the solution?