I didn't look at its features, and I probably wouldn't understand them (or know your requirements) if I did. It was just one of three I clicked on at random on that site, all in a similar price range, and 2 out of those 3 had 12V DC inputs - so I strongly suspect that, if you looked around, you'd probably find one that suited your requirements (feature/performance-wise) which could be run directly from 12V DC - which would be much simpler (and maybe even cheaper) than some of the alternatives being contemplated.
(and also 3.3V) +12V for fans and the motors of drives, -12V for serial (RS232) interfaces (virtually a dead requirement) and 5V (and 3.3V) for all the electronics (logic, CPU etc.).
... or, as I've said, replace the unit with one can that be powered directly from 12V DC - which, as well as the simplest (and lightest!) option, might even be the cheapest.
As far as I remeber the car altenator was/ is AC and would have a set of diodes wired up inside to force the electric in one direction to DC. I dont know how this mixer circut board works though and I dont fancy the idea of making up such circuits, but I have a wee diagram I will upload soon!
not if I allreay have invertor battery and mains charge for it, it wont!
This is not at all unusual of this type of equipment. I have very little insight into the internal workings of Behringer kit but fairly extensive knowledge of older Soundcraft kit (FX, SX & notepad) In these there is a 17-0-17V ac supply feeding a bridge rectifier providing + & - 21V which is then smoothed and regulated to + & - 17V to feed the op-amps. however there is one other little catch, the phantom power for the microphones is 48Vdc. This is achieved by passing the 2 phases of ac through capacitors (to provide dc isolation) and then fullwave rectified to 32V which is then added to the unregulated +21V supply, smoothed and regulated to +48V.
Well, no cheaper, if you already have everything you'd need - but I thought you implied that the battery was not really suitable? In any event, if if not cheaper, it would be appreciably less to lug around - although only you can now what is right/best for you?
Fair enough, but I still don't understand why that needs a 17-0-17V supply?
That one I linked to also had 48V DC of 'phantom power' (a concept I'm unfamiliar with!), but that one is definitely powered with 12V DC - so the 48V must presumably be created by an internal dc-dc up-converter.
'Most sound desks' use op-amps as their active components which run most successfully on a dual supply rail of 15V, the easiest way to derive this from the mains is a 2 phase ac secondary and full wave rectification. Using the voltage doubler/tripler for the 48V phantom is also easy.
I have done frequent battery powered pa systems in the last 50years but mostly for fêtes and sports events where big mixers have not been required. So when I did need it it was very easy and zero cost to use a set of jel batteries as I also have spare power leads (replacements). It probably took 10 minutes to set up. I wasn't using any phantom power so gave that no consideration. My first thought was an inverter but the semi square wave was audible in the system.
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