If you have a relay that accepts actuation voltages of between 9-25V does it matter if you have a relatively large amount of ripple on that line?
I ask because my design steps down 230V-15V with a transformer. I'm wondering whether a simple bridge-rectifier with a basic RC filter would suffice or whether I need to worry about proper regulation.
Two relays will be the only things powered by this loop. There is another secondary that will have a proper 3.3V switch-mode regulator on it for powering the on-board microcontroller.