Subject:
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Re: Does anyone know how to modify a train controler?
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 24 Oct 2001 16:06:20 GMT
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Viewed:
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926 times
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Christopher Masi wrote:
>
> Dean Husby wrote:
> >
> > Rick Clark wrote:
> > >
> > > I've also used this solution for some switching setups, and found it quite
> > > useful. I can answer some questions, but the cost is that I'll ask a new one.
> > >
> > > No explosions, the motors work fine at 12v. I've even taken one up to 14v with
> > > no ill effects, but I'm sure that continued usage would severely shorten the
> > > life of the motor. And yes, the 12v setting will power the 12v light bricks
> > > (as will the 9v), but in either case, you gotta find a way to make the
> > > connectors compatible. The easiest way, I think, is to get a 12v wire, unscrew
> > > the connectors, and separate them from the wire. Then take a 9v wire, cut it
> > > in half, strip and tin the ends, and screw them into the 12v connectors. Now
> > > you have two 9v to 12v connectors. Seems to work great!
> > >
> > > So here's my question: When I set the switch on the multi-voltage unit to
> > > 7.5v, the LEGO speed regulator seems to only have about 3 speed settings, the
> > > fastest of which is about half speed, and the slowest of which isn't really
> > > even strong enough to overcome friction in the motor. So, electronics experts,
> > > how come 7.5v doesn't give me 9 gradients of speed that are ~20% slower than
> > > 9v (7.5 ~=~ 80% of 9) ?
> >
> > I think you've missed the point slightly.
> >
> > We are talking about 9 volt controllers and power supplies to the unit.
> > The STANDARD power supply for the 9 volt controllers is 12 VOLTS AC! It
> > turns it into DC 9 VOLTS inside the unit.
> >
> > When your using the less then 12 volts mode you're STILL taking the 3
> > volt hit inside and the end result is a lowered total output.
> >
> > In your example, 7.5 volts is aprox 5 volts. That's not much for the
> > train. It could degrade even more at low voltages. I'm not sure. I
> > haven't had a chance to try it yet.
> >
> > Dean
> > --
> > Dean Husby
> > LUGNET Member #320
> > TFM's LEGO Workshop - http://www.akasa.bc.ca/tfm
> > The Vancouver LEGO Club - http://www.akasa.bc.ca/vlc/
>
> Also, the voltages that are output in the 6 steps do not increase linearly.
> One might think that the settings (based on 9v max) are 1.5, 3, 4.5, 6, 7.5, and
> 9, but they aren't. I cannot remember where the scale starts on the speed
> controller, but I think it is around 3V. Below that setting (3V?), there just
> isn't enough juice to get the motor moving.
You are right. I think it's 2.9 volts or there abouts. Anything less and
it's too low.
Inside is just mis matched resistors. As you turn the knob up it just
pulls more of them out of the circuit.
Dean
--
Dean Husby
LUGNET Member #320
TFM's LEGO Workshop - http://www.akasa.bc.ca/tfm
The Vancouver LEGO Club - http://www.akasa.bc.ca/vlc/
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Message has 1 Reply:
 | | Re: Does anyone know how to modify a train controler?
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| (...) My solution was to add a resistor over them (picture later). Yes the lowest is 2.9V. By adding a resistor over them all makes i affect the higher settings more than the lower ones. This is right for less that 2.9V is not enough for the motor (...) (23 years ago, 25-Oct-01, to lugnet.trains)
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Message is in Reply To:
| | Re: Does anyone know how to modify a train controler?
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| (...) One might think that the settings (based on 9v max) are 1.5, 3, 4.5, 6, 7.5, and 9, but they aren't. I cannot remember where the scale starts on the speed controller, but I think it is around 3V. Below that setting (3V?), there just isn't (...) (23 years ago, 22-Oct-01, to lugnet.trains)
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