Subject:
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Re: The pole reverser - what's it do?
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Newsgroups:
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lugnet.technic, lugnet.trains
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Date:
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Tue, 24 Feb 2009 08:12:32 GMT
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Viewed:
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37597 times
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In lugnet.technic, Stump Dunn wrote:
> > C) the LEDs have a built in bridge rectifier and connect to the two inside
> > contacts, of which can change direction based on battery box switch position
> > or reversing switch position.
>
> And the winner is...... C!!!!
> I put my meter on the outside poles and got nothing. open.
> I put my meter on the inside poles and found 9M ohms in one direction but 6M in
> the other ?
>
> This means the lights[1] use the same source as the IR receivers which should be
> constant.
> Good news for train fans is that now when you increase or decrease the speed of
> your train, the lights do not change their brightness !! I'm sure many train
> builders have been begging for that. The differences in resistance based on
> polarity could also result in trains (or PF motors) running faster in one
> direction [2] when used in conjunction with lights.
>
> 1> i use the term lights as there is no reason why the resistance would be
> different in reverse polarities for a normal bridge[3] indicating the possible
> use of something other than an LED but this is debatable as they could have
> quite simply put differing zeners in the bridge.
>
> 2>maybe my lights are defective ?
>
> 3> i use the term bridge as a rectifier on a DC circuit would be silly. or
> perhaps it was used by the author in an attempt to make the subject complicated
> and subsequently, to look cool.
>
> Steve
You can see the schematics for the PF lights on Philo's page, to be more
precise, here:
http://www.philohome.com/pf/pflights.htm
Jetro
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Message is in Reply To:
 | | Re: The pole reverser - what's it do?
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| (...) And the winner is...... C!!!! I put my meter on the outside poles and got nothing. open. I put my meter on the inside poles and found 9M ohms in one direction but 6M in the other ? This means the lights[1] use the same source as the IR (...) (18 years ago, 24-Feb-09, to lugnet.technic, lugnet.trains)
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