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ADC-VDB775 wiring guide

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ADC-VDB775 wiring guide

Choose the number of ADC-VDB775s, chime type, number of chimes, and power source connected to the same circuit to view a wiring guide for that configuration.

Select the number of VDB775s
Select the type of chime
Select the number of chimes
Select the power source
Wire one VDB775 to no chime and an AC Transformer
Transformer 16-24VAC 10-30VA (16VAC 10VA recommended)
Power Module Not Required
Mechanical Chime Dongle Not Required
Chime Type No wired chime

Attach both wires from the transformer to the terminals on the back of the ADC-VDB775.

Wire one VDB775 to no chime and a DC Adapter
Power Supply 16V DC PSU
Power Module Not Required
Mechanical Chime Dongle Not Required
Chime Type No wired chime

Attach both wires from the DC adapter to the terminals on the back of the ADC-VDB775.

Wire one VDB775 to one mechanical chime and an AC Transformer
Transformer 16-24VAC 10-30VA (16VAC 10VA recommended)
Power Module Not Required
Mechanical Chime Dongle ADC-VDBA-MCD required (x1)
Chime Type Mechanical
  1. Attach the TRANS terminal on the chime to one of the terminals on the transformer.
  2. Attach either one of the wires on the ADC-VDB775 to the FRONT or REAR terminal of the chime.
  3. Attach the other wire from the ADC-VDB775 to the remaining open terminal on the transformer.
  4. Attach the Mechanical Chime Dongle to the same terminals on the chime as the transformer and doorbell.
Wire one VDB775 to one mechanical chime and a DC Adapter
Power Supply 16V DC PSU
Power Module Not Required
Mechanical Chime Dongle ADC-VDBA-MCD required (x1)
Chime Type Mechanical
  1. Attach the TRANS terminal on the chime to one of the terminals on the DC adapter.
  2. Attach either one of the wires on the ADC-VDB775 to the FRONT or REAR terminal of the chime.
  3. Attach the other wire from the ADC-VDB775 to the remaining open terminal on the DC adapter.
  4. Attach the Mechanical Chime Dongle to the same terminals on the chime as the DC adapter and doorbell.
Wire one VDB775 to one digital chime and an AC Transformer
Transformer 16-24VAC 10-30VA (16VAC 10VA recommended)
Power Module ADC-VDBA-775-PM required (x1)
Mechanical Chime Dongle Not Required
Chime Type Digital
  1. Attach the TRANS terminal on the chime to one of the terminals on the transformer.
  2. Attach either one of the wires on the ADC-VDB775 to the FRONTor REAR terminal of the chime.
  3. Attach the other wire from the ADC-VDB775 to the remaining open terminal on the transformer.
  4. Attach the Power Module to the same terminals on the chime as the transformer and doorbell.
Wire one VDB775 to one digital chime and a DC Adapter
Power Supply 16V DC PSU
Power Module ADC-VDBA-775-PM required (x1)
Mechanical Chime Dongle Not Required
Chime Type Digital
  1. Attach the TRANS terminal on the chime to one of the terminals on the DC adapter.
  2. Attach either one of the wires on the ADC-VDB775 to the FRONTor REAR terminal of the chime.
  3. Attach the other wire from the ADC-VDB775 to the remaining open terminal on the DC adapter.
  4. Attach the Power Module to the same terminals on the chime as the DC adapter and doorbell.
Wire one VDB775 to two mechanical chimes with an AC Transformer
Transformer 16-24VAC 10-30VA
Power Module Not Required
Mechanical Chime Dongle ADC-VDBA-MCD required (x1)
Chime Type Mechanical
  1. Attach either terminal of the transformer to the& TRANS terminal of each chime. A wire connector may be used to simplify the wiring at the transformer terminal.
  2. Attach either wire of the ADC-VDB775 to the FRONT or REAR terminal of each chime. A wire connector may be used to simplify the wiring at the doorbell backplate.
  3. Attach the other wire of the ADC-VDB775 to the remaining open terminal on the transformer.
  4. For the Mechanical Chime Dongles:
    1. Attach one Mechanical Chime Dongle to the FRONT and TRANS terminals of one chime.
    2. Attach the other Mechanical Chime Dongle to the REAR and TRANS terminals of the other chime.
Wire one VDB775 to two mechanical chimes with a DC Adapter
Power Supply 16V DC PSU
Power Module Not Required
Mechanical Chime Dongle ADC-VDBA-MCD required (x2)
Chime Type Mechanical
  1. Attach either terminal of the DC adapter to the TRANS terminal of each chime. A wire connector may be used to simplify the wiring at the transformer terminal.
  2. Attach either wire of the ADC-VDB775 to the FRONT or REAR terminal of each chime. A wire connector may be used to simplify the wiring at the doorbell backplate.
  3. Attach the other wire of the ADC-VDB775 to the remaining open terminal on the DC adapter.
  4. For the Mechanical Chime Dongles, choose any one of the following compatible setups:
    • Attach a Mechanical Chime Dongle to the FRONT and TRANS terminals of both chimes.
    • Attach a Mechanical Chime Dongle to the REAR and TRANS terminals of both chimes.
    • Attach one Mechanical Chime Dongle to the FRONT and TRANS terminals of one chime, and attach one Mechanical Chime Dongle to the REAR and TRANS terminals of the other chime.
Wire one VDB775 to two digital chimes with an AC Transformer
Transformer 16VAC 30-40VA
Power Module ADC-VDBA-775-PM required (x2)
Mechanical Chime Dongle Not Required
Chime Type Digital
  1. Attach either terminal of the transformer to the TRANS terminal of each chime. A wire connector may be used to simplify the wiring at the transformer terminal.
  2. Attach either wire of the ADC-VDB775 to the FRONT or REAR terminal of each chime. A wire connector may be used to simplify the wiring at the doorbell backplate.
  3. Attach the other wire of the ADC-VDB775 to the remaining open terminal on the transformer.
  4. For each Power Module, attach the wires interchangeably to the same terminals on the chime as the ADC-VDB775 (e.g., if the VDB775 is attached to the FRONT and TRANS terminals on both chimes, attach one Power Module to the FRONT and TRANS terminals on each of the chimes).
Wire two VDB775s to one mechanical chime and an AC Transformer
Transformer 24VAC 20-30VA
Power Module Not Required
Mechanical Chime Dongle ADC-VDBA-MCD required (x1)
Chime Type Mechanical
  1. Attach either terminal of the transformer to the TRANS terminal on the chime.
  2. For each ADC-VDB775:
    1. Attach either wire interchangeably to the FRONT or REAR terminal of the chime.
    2. Attach the other wire to the remaining open terminal on the transformer. Both VDB775s will be attached to the same terminal on the transformer.
  3. For the Mechanical Chime Dongle, choose either of the following compatible setups:
    • Attach the Mechanical Chime Dongle to the FRONT and TRANS terminals of the chime.
    • Attach the Mechanical Chime Dongle to the REAR and TRANS terminals of the chime.
Wire two VDB775s to one mechanical chime and a DC Adapter
Power Supply 16V DC PSU
Power Module Not Required
Mechanical Chime Dongle ADC-VDBA-MCD required (x1)
Chime Type Mechanical
  1. Attach either terminal of the DC adapter to the TRANS terminal on the chime.
  2. For each ADC-VDB775:
    1. Attach either wire interchangeably to the FRONT or REAR terminal of the chime.
    2. Attach the other wire to the remaining open terminal on the DC adapter. Both VDB775s will be attached to the same terminal on the DC adapter.
  3. For the Mechanical Chime Dongle, choose either of the following compatible setups:
    • Attach the Mechanical Chime Dongle to the FRONT and TRANS terminals of the chime.
    • Attach the Mechanical Chime Dongle to the REAR and TRANS terminals of the chime.
Wire two VDB775s to two mechanical chimes and an AC Transformer

The combination selected has not been verified yet for the ADC-VDB775.

Wire two VDB775s to no chime and a DC Adapter

The combination selected has not been verified yet for the ADC-VDB775.

Wire two VDB775s to no chime and an AC Transformer

The combination selected has not been verified yet for the ADC-VDB775.

Frequently asked questions

18-20 gauge wire (AWG) is supported for all video doorbell camera installations. 18-20 AWG provides the correct amount of resistance needed to power a video doorbell camera.

Gauges outside of these recommendations affect the resistance of the wire and may deliver incorrect power to the device. 

No. The ADC-VDB770's Power Module (ADC-VDBA-PM) is not intended for use with the ADC-VDB775. If an installation requires a Power Module, you must use the Alarm.com VDB775 Power Module (ADC-VDBA-775-PM).

Yes. Verify that the transformer can support the power requirements for both the ADC-VDB775 and the other doorbell.

If the transformer can support the power needs of both doorbells, wire each doorbell independently according to the manufacturer's specifications.