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Need suggestion about triac switching design

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vibeeshpv

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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..
 

Re: triac switching

pls give any suggestions
 

Re: triac switching

hi it is tested circuit

26_1167309824.JPG
 

Re: triac switching

pls send me some e books of triac tutorials
 

Re: triac switching

you first test this circuit ........ for under standing the basics of the triac........

see any power electronics course book
 

Re: triac switching

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)

Cheers
 

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