Discussion in 'Accessories' started by nayr, Oct 3, 2016.
Recording Phone Calls and Conversations | Digital Media Law Project
I will take the picture tomorrow.
How-To: Audio Inputs
I do understand how to use the 12V Splitter but that wouldn't work on a POE+ for the PTZ. Just curious to see how this one was hooked up, and might make me buy more Mics or just stay with the one. Was hoping to get at least one camera to record sound, but would be awesome if I could take that sound and make it universal for all the cameras by a setting in the NVR ?
I see @nayr fixed you up for the most part.
My mic and camera is still on my test mount. But when it's installed, I will pull wire to power the mic from a wallwart in my garage. Not powered from POE+.
Just a word of caution, when you power a mic with a power adapter that's farther away / farther from the camera's power source you increase your odds of picking up interference. If you experience significant interference the key is to minimize the area of the ground loop. It may work just fine, it's just something to be aware of.
Thanks @tangent I was not aware of that. When you say "to minimize the area of the ground loop", can you explain that please?
I will be powering the camera from it's 24v ac transformer, not poe+. I see that an injector at the camera won't work, and I've not be able to find an 24v AC to 12vDC converter to put at the camera. Any other tips appreciated. Thanks.
Ultimately for something like this it comes down to experimentation it may or may not be an issue with the devices and distances in play. In situations like this there's a ground loop between the 2 power supplies and devices. If you had 2 wires that created a loop and spread them far apart like a hula hoop the area of this loop would be relatively large. If the wires are close together as in a jacketed cable the area is much smaller but depends on the length of the cable (shielded cable helps). The twists in UTP cable also reduce loop area / parasitic inductance by introducing parasitic capacitance. The portion of the loop between the power supplies is probably the hardest to control.
This mic has some internal filtering that may filter out a lot of the interference.
Here are a couple links on the subject of ground loops:
Ground loop (electricity) - Wikipedia
Here's a 24vac to 12vdc adapter I found:
Amazon.com: 24VAC To 12VDC Convertor For CCTV Security Camera Power Supply Adaptor: Home Audio & Theater
Thank you @tangent. My search fu is weak it seems. I really appreciate the help.
Part ordered! Thanks again!
This one might actually be smaller: Amazon.com : Speco 24 Volt CCTV Power Converter : Camera & Photo
The earlier can output a lot more power than the mic needs, even this one @ 0.5a is more than you need for the mic.
Wonder if this mic could be Poe powered by the splitter and run it back to mic in on NVR. If that was done would it play sound for all the cameras on the NVR. Have the mic and splitter and wondering if I am stuck buying one for each camera and have 2 PTZs that I will need to also put mic's on as well.
no idea, kinda doubt it.. just play back both feeds in sync and turn the audio on the camera taht has audio.. if you really need to you can post edit it.
all my cameas have there own mic's, even if they overlap.. provides better coverage
So on the PTZ how would be the best way to power the Mic since it is POE+.
On the fixed it is easy, as just use the POE splitter, but the PTZ's not sure about ?
power it with 24vac and use a 24vac to 12v adapter.. Amazon.com: TTnight Power Converter AC 24V to DC 12V 3A Adapter for CCTV Security Camera: Home Audio & Theater
why can you use the POE on the PTZ with a splitter to power the Mic but it will work with a fixed one?
PTZ uses PoE+ and ~22-23W; the PoE to 12V Splitter does not passthrough PoE.. it splits out 12W of 12V and its not enough to power a PTZ let alone the Mic + PTZ.
Got it now thanks
Small it is! Nice find!
nayr do you have instructions pics of how to wire this I have on order a Dahua SD59225U-HNI I just got the
Microseven M7WP-MIC waterproof outdoor Microphone & TTnight Power Converter AC 24V to DC 12V 3A Adapter for CCTV Security Camera. Thanks for your Help
It's pretty easy...
-Connect the 24 VAC power cable and the power adapter inputs to the power terminals on the camera
-Connect the 12VDC out to the power connector on the microphone, if they're different sizes an adapter or some splicing will be required. Verify matching polarity
-Connect the audio out from the mic to the camera, from the pics @looney2ns posted this camera doesn't have an RCA connector on the input so you have to splice something together. Something like this being the easiest option: Amazon.com: UHPPOTE 5 Pairs Phono RCA Female + Male Plug AV Screw Terminal Connector Video AV Balun: Home Audio & Theater
I was going to use PoE+ for the PTZ
then you'll have to find another way to supply 12v power to the microphone..
Bought another one of these to replace a failed cheapo microphone, wanted to add some wind protection to em both so I got a pack of these: Amazon.com: Tetra-Teknica XFFZ5P-BLK Lapel & Headset Microphone Windscreen, Color Black, 5-Pack: Musical Instruments
it was a tight fit, but it works
wont come off easily but leave a lil slack on the end so there is a dead space infront of the pickup.. mine are installed protected from most of the weather.
I find giving the microphone a downard tilt usually helps avoid the direct wind, it rarely comes from the ground level.. I dont expect this alone to completely cure wind noise, but it should dramatically reduce it without looking funky.. I dont live in a windy environment so it wont take much to make me happy.
Any noticable difference in voice pickup? We have lots of wind.
nope, I put one on the Ultra tonight and I cannot tell any difference in pickup.. its pretty still tonight so no functional testing to speak of yet, but ive used these before with good results, works better than styrofoam and there is no way around it.
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