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3781  |  3783
Subject: 
Re: The Future of Trains
Newsgroups: 
lugnet.lego, lugnet.robotics.nxt, lugnet.trains
Date: 
Mon, 8 Oct 2007 22:03:39 GMT
Viewed: 
41396 times
  
In lugnet.lego, Philippe Hurbain wrote:
In lugnet.lego, Brian Davis wrote:
In lugnet.lego, Philippe Hurbain wrote:

A practical value is about 1A - NXT motor driver itself
limits the current around 1A too.

Ah, thank you - so running two stalled train motors would exceed the NXT output,
but running one train motor up to a stall conditions should be fine. Out of
curiosity, along with the output limitations on the NXT (1 A) and RCX (500 mA),
does anyone have the output limitations (voltage and current) on the train
transformer?

The linear regulator inside is a 1.5A version if I remember well, but I may be
wrong. Cross posted to lugnet.trains trying to get train guru opinion...

The Australian LEGO wall wart is marked 10V @ 7VA on the secondary. I don't
recall all the stuff I learnt about the relationship between VA and W, but that
seems to me to indicate about 0.7A. I believe this generally reduces as load
increases, but again I don't recall all that stuff... Philo?

M>ltc uses a home-built 3A transformer for our displays.

ROSCO



Message has 1 Reply:
  Re: The Future of Trains
 
(...) You are right, the main limitation probably comes from wall wart... You are essentially right for the 0.7A current (though it is not hard limit, rather a safety one). Philo (17 years ago, 9-Oct-07, to lugnet.lego, lugnet.robotics.nxt, lugnet.trains)

Message is in Reply To:
  Re: The Future of Trains
 
(...) The linear regulator inside is a 1.5A version if I remember well, but I may be wrong. Cross posted to lugnet.trains trying to get train guru opinion... Philo (17 years ago, 8-Oct-07, to lugnet.lego, lugnet.robotics.nxt, lugnet.trains)

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