Subject:
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Re: Electrical Things (was: Railroad Dilemma)
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Newsgroups:
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lugnet.trains
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Date:
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Mon, 8 Mar 1999 23:09:08 GMT
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Viewed:
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2797 times
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Larry Pieniazek writes:
> Matthew Bates wrote:
> >
> > Simon Robinson writes:
>
> > > If you have any URL's where people have reported on this, I'd be • interested.
> > So would I, because it's not true! As I've said this many times, it's plain
> > and simple variable DC voltage with 6 steps. Look at...
> >
> > http://ourworld.compuserve.com/homepages/train_depot/current.htm
>
> Your page says you used a voltmeter. That is insufficient evidence. Put
> it on a scope.
True, I used a voltmeter to generate the data on that page, but I didn't claim
anywhere on my page or previous posts that that was what I used to prove it is
not PWM. Proof is obtained by opening the controller, getting the number of
the chip used and looking it up in a databook. Turns out to be a simple
variable voltage regulator.
Matt
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Electrical Things (was: Railroad Dilemma)
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| (...) it on a scope. If we have a PWM voltage with a 50% duty cycle and 10 millisecond period An analog voltmeter will report the average voltage of 4.5, not 5 milliseconds DC 9V and 5 milliseconds DC 0V because it does not have the timescale (...) (25 years ago, 8-Mar-99, to lugnet.trains)
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