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In lugnet.technic, Erik Bush wrote:
> In lugnet.technic, Steve Hassenplug wrote:
> > In lugnet.technic, Anthony Sava wrote:
> > >
> > > I have a MOC in mind in which I'd like to use my motor.
> > > But I also want a few lights in my display. After all, being a medieval builder
> > > I'd like some fireplaces to light up. I've been told by a friend that it is
> > > possible to daisy chain light bricks, even motors, so I'm hoping that my one
> > > battery box will be sufficiant.
> > >
> > > So on to my question:
> > >
> > > How many light bricks can I add to my MOC, using the 2838 9v Motor and 2847 9v
> > > Battery Box before I see a signifigant drop in performance or hurt my electric
> > > parts?
> >
> >
> >
> > Anthony,
> >
> > Nice, clear question.
> >
> > You won't hurt your electric parts by running too little voltage through them.
> >
> > As you add lights, existing lights will get dimmer, the motor will run slower,
> > and the batteries will not last as long.
> >
> > You MAY hurt the motor, if you run a very small voltage (not enough to turn it)
> > through it for a while. But I doubt it.
> >
> > On good batteries, I'm sure you could light 3 or 4 lights, in addition to
> > running the motor. I don't know how long, but I'd GUESS it would work for a
> > couple hours.
> >
> > If you want to light and run the display for a long time (all day) you may want
> > to look into an AC source.
> >
> > Steve
>
>
> Hey,
>
> You are right, having more lights will slow the motor and dim the lights. But
> if you think about it, he want's to make fireplaces and I think dim lights (if
> not too dim) would work fine.
>
> Yeh, an AC source is almost always a must in this situation so that you are
> not ruining the motor under low power.
>
>
> Build Well
> Erik Bush
An AC source isn't portable though! Anthony, you mentioned a substantial length
of wire. Is the model static or moving?
If it's static then a Train controller, RCX with AC socket or Control Center
could do the job. The train controller can supply 300mA, of which the motor
will take 200mA at reasonable load (100mA light load). I'm not sure exactly how
much the lights take. I wish TLC would make light bricks with white LEDs, so
that the current was max 20mA and you could use more for the same battery power.
Incandescent bulbs are quite wasteful in heat, and only the Lego grenhouse for
schools uss the bulb for heat.
Mark Bellis
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Message is in Reply To:
 | | Re: Question from a beginner
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| (...) Hey, You are right, having more lights will slow the motor and dim the lights. But if you think about it, he want's to make fireplaces and I think dim lights (if not too dim) would work fine. Yeh, an AC source is almost always a must in this (...) (20 years ago, 31-Mar-04, to lugnet.technic, lugnet.general)
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