Sad....my electrician told me HDB doorbell is run by battery and he can't help me to wired my nest to the power sourcejust cancelled my order of my nest already. Anyone has a electrician that knows how to do this?
There are a lot of YouTube video on wiring it to a 16-24V adapter. Don’t need electrician.
https://www.instructables.com/id/Making-a-Door-Bell-Chime-With-Integrated-Transform/
The spec on indoor adapter
https://store.google.com/product/ninety7_indoor_power_adapter_nest_hello
Power output: 20VAC, 500mAh
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