Subject:
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Re: Powering Power Functions Using a 9V Train Regulator
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 25 Feb 2009 10:42:45 GMT
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Viewed:
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19160 times
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> Everything you ever wanted to know about LPF but were afraid to ask:
> http://www.philohome.com/pf/pf.htm
>
> (Thanks Philo!)
;o)
Rob explained the problem you encounter - there is nonetheless a workaround
using only LEGO components, explained here
http://freelug.fr/article.php3?id_article=813. Sorry, it's in French, you'll
have to use a web translator.
A big warning: using this setup, it is possible to power the PFS system
backwards. To make it safe, just connect the empty battery block to the train
transformer and set it to on position (battery switch direction doesn't matter).
Now power the train controller. The green led of the battery pack will glow if
the 9V connector is properly connected and train dial is turned in the right
direction. You can then safely connect the IR receiver.
That said, since the train controller is over current protected and since there
is a diode in the battery pack, (see schematics here
http://philohome.com/alimservo/schema.gif). you should not burn anything if the
train controller is backwards for a limited time period.
Philo
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Message is in Reply To:
 | | Re: Powering Power Functions Using a 9V Train Regulator
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| (...) The receiver works on the outer most two contacts of the PF cable, and the "legacy 9v" run on the inner most two wires. Basically, outer wires for the power bus for controllers, and inner two wires for load items such as lights and batteries. (...) (15 years ago, 25-Feb-09, to lugnet.technic)
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