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How an alarm works
Quick picture I made, explaining how a - VE trigger alarm works. All new panels use Mosfet transistors, instead of relays. I believe that on some even more modern panels, the switching is done through the microprocessor, instead of the transistors.
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Old Alarm Concept System Main Panel Front Label
A modern re-design nearly 30 years later of the ADE Concept panel front cover stickler label thing.
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