i want switch ON and OFF a fan or bulb using triac .The switch on time is 5min and switch off time 2 min for that i desgined a circuit using 555 but the system is not working .wether 555 can directly interface (BT136) the triac.i used transistor buffer to interface .pls give me suggestions...if any one hav circuit diagram then pls send me..
I believe there are ICs designed for this specific purpose. I would suggest using them. I once switched off and on a thyristor useing TCA785 (I might have forgotten the exact number)