buzzer

fail safe means the door is open when it loses power? is that when you need the alarm?

--Shiva--

Switch the strike over to AC and remove the rectifier from the line feeding the power to the strike. be sure the voltage delivered to the strike in the AC mode is proper. Some strikes can run on either but the voltage is different.

Alternatively, you can add a noise maker of some sort (buzzer chime etc.) in parallel with the strike.

DC is usually used on an electric strike for two reasons, first either the strike is to be active for extended periods of time,( think about situations where unfettered access is allowed during certain hours like a Laundromat or something) or silent operation is desired even if the duty is intermittent.

Yes I want the person being allowed in, to know when the strike is opened. That means i have to supply power to the buzzer when the strike is not getting power. Do you know of something that I can put at the push button?

methinks you are thinking wrong.. but.. you are 'dropping the power' to the strike when the button is pushed? yes? then talk to a GOOD electrical supply house.. momentary contact, always ON, and double pole. push the button, side one drops..allowing the latch to open, and the other set of contacts at the same time drop a small indicator lamp? or if you can get a switch that the SECOND side turns ON, (like a small relay pulling on) then you can turn on the buzzer.. talk to a good electrical switch man and se if one isnt available. it could be done with a small relay, push the button and the relay turns OFF, switching the relay contacts to drop the latch BUT at the same time turn on the buzzer, till the lock relocks.

--Shiva--