Does this wiring look correct?

[fern-card]

Hi folks! I've been using a Plus Uni to control my intercom for some time and it's been working great! The voltometer is wired to a BUS on the intercom that runs at 18-24VDC, and the Shelly is powered by a 5VDC USB Charger plugged into a battery pack. However, I'd like to power the Shelly from the same circuit as the intercom itself and avoid having to switch a battery pack every week 🙂

I drew up what the new circuit would look like, does this look correct? It seems simple, but I'm not very experienced in electronics. Thanks!

 

Edited November 29 by fern-card
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[thgoebel]

Wiring is working, indeed. For „beauty“ reasons, I would suggest to eliminate the connection between GND and Vac2:
 

[wooly]

1 hour ago, thgoebel said:

Wiring is working, indeed. For „beauty“ reasons, I would suggest to eliminate the connection between GND and Vac2:
 

if you remove that connection how the uni would get its power supply ?

[thgoebel]

Via one of the diodes in the full wave bridge and the GND.

Here’s a partial circuit diagram:

 

Edited November 29 by thgoebel

[fern-card]

4 hours ago, thgoebel said:

Wiring is working, indeed. For „beauty“ reasons, I would suggest to eliminate the connection between GND and Vac2:
 

Amazing, even saved me some wiring! Thanks so much for the help 🤩