- Joined Dec 5, 2020
I have a control board for a hot tub that has a 240v input step down transformer that outputs 12v & 5v. Why would this be done when the standard voltage is 120? I'm not an engineer but am very curious why it couldn't have just been a 120v step down transformer. There are a few relays for the pump motor(high & low), heater & aux. There is also an LCD display that connects to the board.