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You can also go to your local central vacuum store and ask for the power supply and relay out of their discarded central vacuums. These are all run on 24 VAC, there is a relay and transformer on all of these units.
Thanks. Just as a reference link, we wrote a blog post about 24VAC relays that we’ve tested internally:
https://opensprinkler.com/using-24v-ac-relays-with-opensprinkler/
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