Two way audio amplification

Info and support on remote viewing on a Hikvision product.
WarwickshireLad
Posts: 1
Joined: Wed Jun 12, 2019 10:47 pm

Two way audio amplification

Postby WarwickshireLad » Wed Jun 12, 2019 11:24 pm

I have a Hikvision DS7608 series NVR with one of the cameras being a mini-dome with two-way audio and alarm I/O.

I want to effect a Video door bell. I have connected a door bell relay contact across the alarm input terminals and this works well with the Hik Connect app giving alarm notifications to a Android phone. I can hear audio from the camera in the app just fine.

As with other forum members before me I am looking for a solution to power a loud speaker in the vicinity of the camera.

Questions

1) Has anyone succeeded deriving dc power from the camera's PoE connection to drive a small amplifier?

2) Is there a recommended amplifier that will run off this power supply?
I was hoping to use a pcb with a LM386 audio chip such as
https://uk.banggood.com/LM386-Module-20 ... rehouse=CN
which is a class A/B amplifier or better still one that uses a class D amplifier which will have a lower power requirement.

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