Working on a design where power supply (on the PCB) is 12VAC to full wave rectifier to 5VDC linear regulator.
Customer switch box is also power via same 12VAC source and will be switching that 12VAC back to my device (retro fit application, must switch the 12VAC). I am looking to use least amount of components. Therefore was thinking I’d half wave the switched 12VAC from customer supplied box and use inverter IC (we stock this so it’s ideal) to interface to my microcontroller.
I am looking for feedback regarding my half wave circuit interfacing to the full wave common (10uF and ULN2804). Have bread boarded this and all looks good. I’d just like verification that the only use of the 12VAC common (not including power supply) is to power the customer supplied device and should not be referenced to any of the input circuit. More or less just want opinion from others who may have more experience with this.