Octava MK-012 Microphone
I have it mounted on my Sony Z1U and it works fine when wired into the camera, which supplies phantom power, but it won't work with my Audio Technica Wireless transmitter. I assume the reason is that the wireless transmitter doesn't provide phantom power.
Two questions: 1. Do any wireless transmitters provide phantom power? 2. Why does my Dynamic microphone that isn't battery powered can work without phantom power and works just fine with the wireless transmitter? |
Quote:
Dynamic mics and condensor mics use two entirely different principles of operation. The dynamic mic is a mini-generator. The vibration of the diaphram causes a coil to move in a magnetic field, generating an electric current in the process, which is sent straight to the recording preamplifier. It works just like a loudspeaker, only in reverse. Condensor mics rely on two charged plates moving with respect to each other changing the conductance of a circuit in some designs, modulating a superimposed AC current in others. This means there needs to be a source of electrical power to charge the plates and also to provide power to operate the internal pre-amp and impedence matching circuitry that makes it all go. Phantom power is one way of fulfilling this power requirement. Battery is another. T-power is yet another. Phantom is a particular scheme used to provide the necessary voltage for a condensor mic over an XLR connection while making it invisible if you accidently connect a dynamic or ribbon mic to it. Ribbon mics are particularly susceptible to damage if you accidently put a voltage across their output terminals. Wireless transmitters usually provide sufficient power to operate a condensor lav mic attached to them but that "mic power" uses a totally different connection scheme and voltage from phantom. The bodypack transmitters provide about 5 volts mic power, sufficient for a typical lav, but that's quite different from 48v phantom. |
thx for the explanation. makes perfect sense now.
|
All times are GMT -6. The time now is 07:55 PM. |
DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network