--- Dieter Doepfer < hardware@... > wrote:

> From: "Dieter Doepfer" < hardware@... >
> To: "Bakis Sirros" < synth_freak_2000@... >
> Subject: Please forward ...
> Date: Tue, 11 Nov 2003 11:13:01 +0100
>
> > Heres me thinking again about how i can get the
> a100 more portable.
> >
> > I was just looking into some other electronics,
> and was
> > considering a couple
> > of 12v sealed lead acid batteries to power it.
> Then i looked at
> > my a100...
> >
> > Say a couple of 7Ah batteries. Now, im presuming
> that the 600mA psu's in
> > the G6 racks are 600mA on each rail (and not
> 300 ). On paper then, the
> > batteries look as if theye last over 10 hours at a
> 600mA drain.
> >
> > Even half that would probably be ample for me
> though. And, of course this
> > is looking at a G6 rack running at full capacity.
> >
> > I think that the sealed lead acid are fairly
> constant voltage,
> > only dropping
> > off sharply at the end of their capacity, which
> would be ideal. The also
> > have the big advantage of being able to be put on
> charge / float at any
> > state of charge (with a 3 stage charger), so you
> can be sure
> > that, when you
> > want to use them, the batteries have a full level
> of charge.
> >
> > Has anyone thought along these paths before What
> sort of conclusions did
> > you reach
> >
> > Cheers, julian
>
> The A-100 should work with two 12V batteries but
>
> 1. some modules will be out of spec (e.g. A-114,
> A-126) as the adjustments
> are made for 12.00V supply voltage and the batteries
> will change their
> voltage in use.
>
> 2. No modules that require strictly +/-12V can be
> used (look at the FAQ page
> for details, e.g. all modules with CEM3381 or 3382)
> as these modules will be
> destroyed with supply voltages beyond 12V.
>
> A solution to keep the +/-12V is the usage of
> batteries > 12V (14V or more)
> with voltage regulators (e.g. the A-100 power supply
> pcb could be modfied
> for this by removing the bridge rectifier and
> connecting the pins to the
> batteries). But the batterie voltage has to be at
> least 1.5V beyond 12V.
> Otherwise the voltage regulators will not work.
>
> And don't forget: to hear anything you will need a
> PA too (i.e. amplifier,
> loudspeakers, maybe mixer ...). And this equipment
> will probably require
> much more power than the A-100.
>
> Dieter Doepfer
>
>
>

=====
Bakis Sirros
Parallel Worlds / Polariton
Athens-Greece
1 group owner
http://www.rubber.gr
http://www.ward12.com

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