Recent content by belias

Hello, I'm working on a fire/burglary alarm panel and I need to add an external relay that closes a circuit whenever a fire alarm is detected (i.e. no voltage, just circuit closure). The alarm panel has one internal relay that activates for fire, and one that activates for burglary; each of...

Thanks for the great replies! Berkeman: Good points with liability concerns. However, this circuit (reminder buzzer) is not a requirement and is something that we add to our ambulances as a convenience. So, in the worst case the buzzer simply would fail to operate and it would be like...

Excellent - I'll give that try. So - I take it there's really no easy way of doing this with solid-state components? Thanks again for the fast response! -Brian

Hello, I'm looking for some help with a (hopefully) simple EE question regarding a DC circuit. I'm a chemical engineer and it's been a while since elec/mag physics for me :-) Here goes: In my life outside engineering, I run a small ambulance service. Our ambulance has a rather annoying...