Re: A Battery Warning query

In article <dei68b$apt$2@xxxxxxxxxxxxxxx>, Dave Martindale <davem@xxxxxxxxx> writes 
Prometheus@xxxxxxxxxxxxxxxxxxxx writes:

The camera will use a regulator(s) to supply the various circuits inside
it with power. If it is a simple linear reg. then it will run warmer
with a higher battery voltage because it has to drop more volts, the
current is unaltered although it is taking higher power from the
battery. If it is a switching reg. then for higher a  battery voltage
the input current will reduce thus maintaining a consistent power
dissipation in the reg. and power consumption from the battery. Since
switching regs are much more efficient and can operate where the input
is less than the required output (or both +ve & -ve lines are required)
they are preferentially used.


For the electronics power, you're probably right.  But the electronic
flash circuitry probably does not go through the regulator, because the
current demand is so high and because the supply voltage doesn't need to
be regulated.  Similarly, motors may be powered directly from the supply
voltage instead of regulated power.

Whilst the inverter for the flash is unlikely to be regulated I would be astonished if the motors which need precise control are not.

--
Ian             G8ILZ
.

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