I’m a little confused on how I would power a Simplex 4050 on for example an MS-5ud considering the NAC’s give off 24vdc? The 4050 I have would need 12VAC. I’ve looked into transformers and inverters but I would need something to trip the inverter/transformer if the panel goes into alarm. The school I go to has a mix of Spectralert Classics and Honeywell SC808a (Simplex 4050) in one building. I think the panels are Deltanet fs9 but not too sure. How would they or a fire alarm technician go about it? Maybe some vintage NAC extenders could help? I apologize if this has already been discussed a while back.