Subject:
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Re: 4.5v upgraded to 9v - ideas welcome.
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Newsgroups:
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lugnet.trains
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Date:
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Mon, 9 Feb 2004 17:44:07 GMT
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Viewed:
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1217 times
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In lugnet.trains, Chris Paton wrote:
> I would like to say "hi" and introduce myself as a LEGO Train newbie. I only
> have the old 7720 set and a load of track. Each time I think of upgrading and
> buying a new train set LEGO releases something new, usually Star Wars, which
> catches my eye and empties my pocket.
>
> So, I have to improvise.
>
> <<http://www.brickshelf.com/cgi-bin/gallery.cgi?i=651030>>
I've done onboard RCX to modified train motor before. I had it read barcodes
along the track to know what station to go to.
http://www.akasa.bc.ca/tfm/lego_rcxtrain.html
That motor now powers my DCC CN engine.
One thing I would suggest is to get a 4.5 volt Zenner diode and put it in into
the solder point between your two wire types. You'll have to play with it to get
it the right way around but that shouldn't be too much of an issue.
This will bring the motor back to ~4.5 volts without loss of torque.
With an RCX and the above power mod you can even slow down and speed up the
motor. If you want to go faster then normal then reduce the Zenner to 3.5 volts
or so.
Here's some info on the Zenner if your interested.
http://hyperphysics.phy-astr.gsu.edu/hbase/solids/zener.html
Hany little thing. I'm finding it VERY useful to bring 12 volt DCC down to 9
volt LEGO without losing torque.
All the best.
Dean
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Message has 1 Reply:
 | | RE: 4.5v upgraded to 9v - ideas welcome.
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| (...) Just remember to limit the current through the Zener diode when dropping the voltage... If you have a 12V supply and try to put a 9V zener without a dropping resistor, it will simply burn out. A zener diode is really a clamping device. Better (...) (20 years ago, 9-Feb-04, to lugnet.trains)
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Message is in Reply To:
| | 4.5v upgraded to 9v - ideas welcome.
|
| I would like to say "hi" and introduce myself as a LEGO Train newbie. I only have the old 7720 set and a load of track. Each time I think of upgrading and buying a new train set LEGO releases something new, usually Star Wars, which catches my eye (...) (20 years ago, 8-Feb-04, to lugnet.trains)
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