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@xxxxxxxxxxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user > _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
