The ADC-VDB770 can be powered by a doorbell chime transformer or a plug-in DC power supply. If there is no transformer installed at the location, or if an existing transformer needs to be replaced, this page goes over the recommended specifications for a new transformer or plug-in DC power supply.
Transformers are most commonly installed next to the breaker box in a home but are also often installed in the walls of a house meaning that the wires would need to be traced to find them.
AC transformers are the primary power method of the VDB770.
Most Alarm.com doorbell installations make use of the existing chime and transformer in the building. A plug-in DC power supply is an alternative option.
Caution: If an ADC-VDB770 is wired to a DC power supply, a 10 Watt 10 Ohm resistor must be added to the circuit to prevent damage to the doorbell camera. The power module is still required. Existing chimes are not compatible with the DC Power Supply setup. For details on the wiring set up go to Alarm.com/doorbell/chime.
DC Power Supply Image