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13. Re: DC power for SD 722

Subject: 13. Re: DC power for SD 722
From: "hartogj" hartogj
Date: Sat Nov 21, 2009 9:58 pm ((PST))
> >> Wire it either:
> >>
> >> pin-1 to negative (-)
> >> pin-4 to positive (+)
> >>
> >> OR
> >>
> >> pin-2 to negative (-)
> >> pin-3 to positive (+)
>
> Can you explain why not both pairs? My understanding was always 1 &
4 (to power) and optionally add 2 & 3 (to charge).

Wiring to 1 & 4 does charge the battery, though only while the unit is powe=
red on. Wiring to 2 & 3 does power the unit, but charges the battery whethe=
r powered off or on.

SD includes your third option further down on the same page in the manual s=
tating, "The included AC-to-DC power supply operates the unit and charges t=
he removable batteries simultaneously. Pins-3 and -4 are wired to (+) and p=
ins-1 and -2 are wired to (=96)."

I think I determined the low battery switch-over problem occurred with all =
three wiring methods, but that was quite a while ago so I would have to dig=
 up those notes to confirm.

John Hartog

















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