I need a timer for the security bell

[sangel]

my friend has a security bell o its dour, and he ask me if any way it can be possible that it will shout down automatically after specific time

its runs on 12V from a baterry

it have to be about 60 seconds, I do not need it to be exatly 60 seconds, plus nimus 10 seconds is OK

thank u 4 your ideas

 

[Sceadwian]

Do a google search for 555 timer delay.

 

[sangel]

thank you, can it possible to build it on tiristor base and not transistor ?

 

[Sceadwian]

thank you, can it possible to build it on tiristor base and not transistor ?

What are you talking about? Tiristor is Spanish for transistor, your question doesn't make any sense.