[LAU] [OT] Building a battery powered PA

[micromoog]

I don't think you'll find anything cheaper than that, because all the
equipment is so commoditized.  Be careful transporting the battery,
though.

On 5/29/10, andy baxter <andy at earthsong.free-online.co.uk> wrote:
> Sorry forgot to send to list (again!)
>
> On 28/05/10 10:13, Jörn Nettingsmeier wrote:
>> On 05/27/2010 06:36 PM, Bob van der Poel wrote:
>>>> A friend of mine was talking about how he would like to be able to
>>>> busk with
>>>> his keyboard, and I said I would look into the possibility of
>>>> building him a
>>>> battery powered PA for it. Does anyone have any suggestions for good
>>>> ways of
>>>> going about this? We would like to keep the cost as low as possible.
>>>>
>>>
>>> How about an off-the-shelf UPS? Don't know how big you'd need, would
>>> depend on the gig time, etc. There is probably a way to calculate that
>>> :)
>>>
>>> The consumer UPS units I've see all have lead-acid (sealed) batteries
>>> and are quite reliable.
>>
>> not really recommendable for a permanent setup. with an ups and
>> standard mains equipment, you will waste battery (and carry dead
>> weight) twice: in the inverter that generates grid voltage from the
>> battery, and in the PSUs of your gear that will re-transform the
>> precious grid voltage back into low-voltage DC. throw out the middle man.
>
> I think we actually need an inverter anyway, because my friend's
> keyboard has a low voltage AC input, not DC, so it would be hard to
> generate that from 12v DC directly.
>
> What I'm thinking of doing is to have the amp running directly from DC,
> using a cheap car amp, but also have an inverter to power the keyboard
> and the effects boxes he uses.
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>