Discuss Multiple audio devices to IP cameras in the Security Alarms, Door Entry and CCTV (Public) area at ElectriciansForums.net

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Good afternoon all,

I am new here, so please excuse my inexperience...

I am looking to add CCTV external outdoor microphones (Netview External microphone) to all 10 of my IP Camera's (Bosch FLEXDOME 5000 outdoor HD). The IP camera's are some distance away from the PoE Switch and NAS storage (furthest is 75 metres).

I need to power these external microphones via 12V DC and connect them to the IP Camera's audio-in - I have attached a diagram of the current setup.

  • My first question is there a Multi output amp that would power all 12v microphones from one power supply? Something that works in a similar way to my 12-channel PoE, but for 12v audio devices
  • My second question would be what type/gauge of cable would be appropriate at the required distances (furthest is 75 metres)?

I appreciate the help that anyone can provide on here. I have been to various Electricians / Security specialist without success

All the best guys and enjoy your weekend

Regards,
Rick

Multiple audio devices to IP cameras Current setu - EletriciansForums.net
 
It looks like you need a 12V DC power supply. The spec for the microphones on the Netview website say the mic takes 20mA of current so you're looking at a minimum of 200mA total (a higher current output would be sensible so it's not running at full chat all the time). Cable size will depend on volt drop - 75m is a relatively long run. You'd need to know what the minimum voltage required to power the microphones is.

By the time you've bought all the cables and run everything in, it's probably easier just to get some new cameras with inbuilt mics.

Having said that, is it possible to get a device to tap off the PoE and provide a 12V output?
 
The cameras are poe
Why do you need an extra power supply?
Just plug the microphones into the jacks..
Are you aware of the legality of recording voices rather than just images?
 
The OP says no power output is available from the camera, the data sheet suggests the same (well, it's not mentioned in the specs for the audio input).
 
Last edited:
Just plug the mic into the audio input
Don’t need a separate supply
That little mic might only use .005 volts
The spec for the mic says 12v DC 20mA. It will likely have a small preamp to feed line level out to the audio input on the camera. The spec for the camera suggests it does not support this as 'phantom power' on the audio input.
 
The existing cameras are poe and have an active audio input for a mic though
The cameras use PoE IEEE 803.3af, probably with a 48V supply. If the OP wants a few mA of 12V local to the camera, one way to do it without additional wiring or power supplies would be to insert a compatible splitter/regulator into the ethernet cable, at the camera end.
 
Okay, fair enough, I must have missed that in the camera specs. I'm not convinced the order of mV is enough to power a mic amp to drive the audio line level input though.
The only value quoted on the datasheet is 0.707V RMS max signal into the audio input, can't see anything about phantom power.
 

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