Analogue-sequencer

> The plan is to run the setup (12 x 86hp of modules) from a coupe of
> sealed lead acid batteries when on the move with it.

> Now its late here, and i haven't looked at all of the schematics, but
> from my brief look, it appears that the 9v (or whatever) supply is
> regulated down to 5v.  Regulating a 12v supply from a SLA battery will,
> if im not mistaken, be a reasonably inefficient way of doing things.

Using a linear regulator will be a bad idea, yes.
A linear regulator is essentially an automatic variable resistor, that
varies it's resistance so that output voltage remains at a constant level
despite the changing load. The resistance wastes power as heat.
What you want is a switching DC-DC step down regulator.
These pulse-wdith modulate the charging current on a cap to maintain to
correct output voltage, so are much more efficient.
Something like this maybe:
http://www.chipcatalog.com/Maxim/MAX724.htm
You'll need to bypass the linear regulator on the P3 mainboard once you have
a 5v high-efficiency battery supply.

Cheers,
Colin f



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