 | | Eliminate high-speed derailments forever! (and possibly void your warranty)
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Okay, how's this for an idea: Most electronic stores stock a kind of universal power converter. These have several output settings, including 9v and 7.5 volt. If you use the 7.5 volt setting, the train never gets enough power to derail on curves. (...) (25 years ago, 23-Aug-99, to lugnet.trains)
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| | Re: Eliminate high-speed derailments forever! (and possibly void your warranty)
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In lugnet.trains, John R. Clark writes: <snipped interesting idea> (...) transformer (...) The transformer in the wall socket adapter probably won't be bothered too terribly, as it's only a 17% reduction in voltage. The motors don't try and suck (...) (25 years ago, 23-Aug-99, to lugnet.trains)
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| | Re: Eliminate high-speed derailments forever! (and possibly void your warranty)
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FWIW: I have two LEGO train transformers that are labeled for an output of 12 VAC and two that are labeled for an output of 11 VAC. Both rate the power output at 7 VA. One of my speed controllers is labeled for an input of 9-11 VAC, and three for an (...) (25 years ago, 23-Aug-99, to lugnet.trains)
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| | Re: Eliminate high-speed derailments forever! (and possibly void your warranty)
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(...) that's (...) transformer (...) transformer (...) by transformer do you mean the lego speed controller? If it's a yes there is no problem feeding it with 7.5V DC. The input will accept 9V to 12V AC or DC for full performance (0V to 9V at the (...) (25 years ago, 23-Aug-99, to lugnet.trains)
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| | Re: Eliminate high-speed derailments forever! (and possibly void your warranty)
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Actually, lowering the voltage would lower the current draw too with a constant load. Of course a motor is anything but a linear load, and it does tend to draw more current at slower rpm. In any case, you're not going to break it, since the 9v train (...) (25 years ago, 23-Aug-99, to lugnet.trains)
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| | Re: Eliminate high-speed derailments forever! (and possibly void your warranty)
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(...) that's (...) transformer (...) I just opened a LEGO TRAIN SPEED REGULATOR and drawn a shematic of it. I did this once before but lost the paper. Now to the point: The INPUT of the regulator may be an AC or a DC signal. Even reversing the (...) (25 years ago, 23-Aug-99, to lugnet.trains)
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| | Re: Eliminate high-speed derailments forever! (and possibly void your warranty)
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Ludo - - Thanks for the great analysis of the LEGO speed control! - Nick - ludo soete wrote: [snip] (...) (25 years ago, 23-Aug-99, to lugnet.trains)
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| | Re: Eliminate high-speed derailments forever! (and possibly void your warranty)
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(...) Electronics is one of my hobbys,and i wanted to know how they (Lego) build there speed controller. In fact,its a basic application of the LM317 regulator. More info abouth the LM317 can be found in a data sheet book from National Semiconductor (...) (25 years ago, 23-Aug-99, to lugnet.trains)
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| | Re: Eliminate high-speed derailments forever! (and possibly void your warranty)
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(...) Wow. Good for them! (and us :-) I would have opened mine too, but am glad that someone put it into good terms. Maybe this is something for the FAQ for those that aren't electronics' newbies? (...) <snip> (...) Very good. (...) <snip> (...) (...) (25 years ago, 24-Aug-99, to lugnet.trains)
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