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Stromverteilung bei mehreren Kameras und PA

Current distribution in multi-camera and PA



Frage von JulianW:
März 2011

Hi everyone,

in brief: I do seminars, a rack (mixer, five microphones, CD players, and so next) have a set of active speakers and three video cameras there.

To avoid the "Buzz" (noah planning more, as the term is), I have the normal s.einem amp dedicated circuit, then everything in the rack s.einem own circuit and the cameras, which are distributed throughout the room anyway, synonymous still s.eigenen outlets.

However, I would like much more "central" are not always looking to cross the room to have sockets. Is there any device, transformer or the like, I can speak from want as Terminals distribution "and where I can then leave it, that all" balanced "is booming and nothing more?

Have no issue about it, but synonymous Money. Meaning, I'm not looking for "money-saving solution," but the option for "Best result with minimum site work." ;-)

Love, Julian!



Antwort von marwie:

So if everything s.einer outlet is shot, it was supposed to give noStörgeräusche for potential differences.
Otherwise you can use as NF transformer for the audio connections, then there a galvanic separation. See, eg http://www.hifi-forum.de/viewthread-42-62.html



Antwort von carstenkurz:

Basically, I do not see why using multiple sockets now is to just avoid hum - usually quite the opposite. However, one would have to know something more about how the devices are all interconnected and the hum occurs s.welchen points. This should be relatively low so s.mixer find. Ideally, one would try synonymous, as the cameras generally operate from batteries, as far as the terms of her reach.

The microphones should already be connected symmetrically. If the camera sound be the problem, the line from these signals can be very simple with simple stereo transmitter 'entbrummen'.

http://www.reichelt.de/?ACTION=3; ARTICLE = 48 085; PROVID = 2402

One can, of course, synonymous to spend any more money for professional DI boxes.

I would adopt such a system in principle only a single socket only if other reasons for it for several.


- Carsten








Antwort von JulianW:

Hi everyone,

in the summer of 2010 I had a camera team in the of have taken my mixer and recorded professionally. The manager initially had problems with the buzzing, what came of my mixer. He said I should "put apart" a few things, then distribute the times on different branch circuits, and promptly got better. Since then, I thought: different power circuits are better.

Everything in the rack depends s.einem multiple sockets, so mixer, currently the five microphones (AKG 2xSennheiser and 3x), double-CD player, effects unit and mixer), if I have an outlet "to" get the mixer one's own .
Number two is the amplifier, the active box, which I have always depended s.einen own circuit. Is in my perception containing the "Stromfressendste.
One of the cameras is then located near the mixer, because I directly from the camera synonymous with the sound of the mixer receiving. The other two cameras are not problematic, which are distributed in space and the sound I suppose because only with the personal micro-camera for later synchronization with on (and possibly as a backup).

So much for the "body". And exactly the last time resulted in an extremely strong buzz, and I as synonymous the cables that have led to the mixer from the Camera ... well, I should not even take on new cable and some who still have two reversing it. * Blush *

In itself the question: How would the construction from the perspective of "trouble-free power distribution" her best and can be improved with any of the devices?

Love, Julian!



Antwort von carstenkurz:

What were the cameras then? Typically arise in such circumstances not only the noise in the system itself or through the power usage, but on the audio cable to the camera. Mixers usually have at least one balanced output, as it is a very simple solution to lead a balanced cable to Camera and Camera s.der desymmetrieren to first behind a transformer. In most cases, long unbalanced cable s.MicEingängen camcorders of the problem. first test by turning up s.Mixer / powered speakers, that the system is clearly booming - in other words. If so, you must first analyze the problem within the system. If it is not booming in the pits or under the headphones, the problem will occur only when the transmission to the camera. Can of course play around with the power supply because sometimes accidentally make a small improvement, but fundamentally we should improve the audio transmission to the camera.

'Hum' is often perceived as a diffuse overall problem, but one can in such situations to find out more concrete, s.welchen Make it arises.


- Carsten




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