I want to build an alarm clock with a 120v ac fire alarm bell rigged to ring with the clock alarm.
I'm planning on using the signal to the clock alarm to activate the 5v coil of a relay with contacts rated for 6 amps. If the signal is pulsing I want to use a capacitor to even it out.
I've made about 3 of this kind of alarm clock before, but the technology is always changing. No two digital alarm clocks are the same. I just have to take it apart and test the circuits until I find the alarm signal, then go from there.