Besides going down the path for a N x 400mA of linear regulator for the
first 5% from fresh charged and suffer 5.5 to 5.7V for the remaining
discharge cycle, here is an alternative. You know, a fresh charged 5 cell
pack can peak at 7.5V or so. This voltage cannot sustain beyond 5% into
discharge and will stay marginally above 6V until 5V declaring at final
discharge. If that is OK to our Futaba here, we have something that might
work.... If we have a 550 mAH pack discharge 1.65A for one minute will
leave the pack at 6V or so and a 95% of remaining capacity. There are few
thing handy that can provide similar current drain. How about a free run 6V
speed 400 motor? (if desired, fine adjust motor commutator timing for 1.63A
sharp. A free run motor is consider as a constant current drain device
under fractional change of supply voltage). A 3.66 ohm 10W resistor?. A 10W
6V light bulb?
YK Chan
Seattle area
----- Original Message -----
From: Erik Wikran <[EMAIL PROTECTED]>
To: Soaring-Digest <[EMAIL PROTECTED]>
Sent: Tuesday, March 28, 2000 2:19 PM
Subject: [RCSE] 4 vs 5 cell battery
> I have two Futaba receivers (R138DP/R148DP) that I want to use in full
> house planes. I also want to use 5 cell battery packs but I am having
> trouble with the receivers/servos (JR3341). With a 4 cell pack every
> thing is acting OK but with 5 cells they are going crazy. The receivers
> ar rated at 4.4-6.0V but the 5 cell pack is putting out 6.7-6.9V. Is
> there an easy way to regulate the voltage down to a stable 6.0V? Any
> suggestions?
>
> BTW: I have tested it with a Hitech DC receiver and there were no
> problems at all on 5 cells.
> --
> Regards
> Erik Wikran
> Tromso, Norway
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