Google hello and wired doorbell gen 2 with single chime

[AnthonyLeung80]

I have a hello gen 1 doorbell for the back entrance and a gen 2 wired doorbell fot the front entrance. Home has one chime only and the transformer is rated 16vac/30 VA. The chime connector for the hello is quite different from the chime connector for the wired gen2. Can someone upload a diagram how I can wire both doorbells to the chime box with the two connectors? Are two chime connectors necessary or can I just use a single chime connector only? Fyi, I’m using the connector for the gen2 currently and it’s connected to the transformer and  and front. Both front and rear doorbell works well but I hear an audible hum from the chime box. Thanks in advanced. 

[Juni]

Hi AnthonyLeung80,

Thanks for posting here in the Google Nest Community.
 

Sorry to hear about the trouble. I wanted to follow up and see if I could be of any help. Each doorbell has its own voltage requirement. It could be the reason why you are experiencing a hum. You can refer to this link to get more details. Hope this helps.
 

Let us know if you need further help by updating this thread, and we're glad to assist you further.

Thanks,

Juni

[Juni]

Hi there,

Buzzing in — do you still need our help? Don't hesitate to reach back if you do.
 

Best,

Juni

[Juni]

Hi there,

We haven’t heard back from you, I'll be locking this thread in 24 hours. Feel free to create a new one if you have more questions or have other concerns in the future.
 

Regards,

Juni