So just use a rectifier and a small buck converter, no transformer. Is that correct?
"good luck" finding a transformer with a 24V primary
With all the other constructive help, may I remind you there is no "GROUND" connection with your 24 VAC transformer
I want to run an arduino at my HVAC thermostat to monitor the "on" time. It's a very simple coding/wiring project. Ideally, I'll power the breadboard right at the thermostat (HVAC systems use 24vac) so I'd like a small, breadboard mounted transformer/regulator.
It doesn't matter because the 24Vac is tapped off the HVAC power and the rectifier has a ground.
5x7 red LED dot matrix. SunLED XMMR18C, specifically. Probably only using 20-50mA to power it?