Wiring Doorbells Schematic - Document No DCP0002129 JC 28/04/04 Rev 6 Page 2 PDA200E Induction Loop System - Installation Guide PDA200E Induction Loop— Example Installation This schematic shows an example system which utilises a desk mounted microphone (AMT) wired direct into the PDA200E , two wall mounted mics (APM) and a 100V line feed from a public address system.. Great battery-powered doorbell with dual chimes (ie. front and/or back doors), just make sure you use un-lighted doorbell button(s). Problem with AC-powered doorbells, is the transformer acts like a small block heater that constantly consumes electricity, which over time adds up, and in some cases significantly.. THE POWER SUPPLY Sometimes you will see a circuit as shown in the first diagram with 12v or +12v on the top rail and 0v or a negative sign or the word "negative" on the bottom rail. In this case the word negative means earth or "chassis of a car" and we commonly refer to this as "negative earth" or "negative chassis." In the second diagram, the output from a power supply has a positive 12.
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