I have a digital alarm clock. I want to wire the alarm signal to activate a fire bell. The fire bell is 120vac @ 40mA. The alarm signal from the clock is around 1.5 vdc.
I found a connection on the alarm clock that is 7.5 vdc all the time.
I have 5vdc relays with contacts rated for 6 amps. I have some 5vdc reed relays. None of them work for the 1.5 vdc alarm signal. I tried messing with some transistors but I don't know enough about them to rig something up. I have a bunch of resistors and capacitors.
I have a second alarm clock where the alarm is connected to a small speaker. I'd like the fire alarm to go off when the speaker beeps a signal or when the radio alarm goes off.