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In lugnet.trains, David Laswell wrote:
> Our club lets kids run the controller for one of the lines when we do certain
> events (like, right now, with Detroit Festival of Trees), but we could use a way
> to forcibly limit the speed on the line that they're allowed to run. One way
> that's really easy is to just build physical stops onto the top of the regulator
> so the dial won't turn as far in either direction, but that makes it difficult
> to actually operate the dial and won't be much fun for the kids. The other
> solution I just came up with would be to maybe limit the voltage going into the
> regulator. And that's where there's a problem. LEGO power adapters, for some
> odd reason, output in ~9vAC, not DC. Finding an AC-AC power adapter is
> difficult at best, and the only two that I can find through Radio Shack (the one
> place I knew of that _does_ sell them) run 9-13vAC or 18-24vAC, which is not
> going to help at all. They do sell an adapter that goes as low as 3v, but it
> outputs in DC instead of AC, and I'm not having much luck doing a generic
> internet search for adapters that output in AC below 9v. Does anyone know where
> I might be able to find such a beast?
Years ago PNLTC used to do this for the kids table at the show. From what I
recall, we just drove a screw though the controller at about the 4th notch in
the black area on each side to keep it from turning too far. It is a very long
lasting, inexpensive and easy solution. Any old PNLTC guys out there remember
exactly how this was done?
If no one pipes up, I would unscrew a controller and see where the screw would
stop the dial without damaging any internal components
-Matt :)
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Message is in Reply To:
 | | Reducing voltage
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| Our club lets kids run the controller for one of the lines when we do certain events (like, right now, with Detroit Festival of Trees), but we could use a way to forcibly limit the speed on the line that they're allowed to run. One way that's really (...) (14 years ago, 23-Nov-09, to lugnet.trains, lugnet.robotics)
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