 | | Re: Railroad Dilemma —Simon Robinson
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| | | (...) I suspect the short would happen even if the two controllers have the same polarity, but are set to different speeds. I'm guessing it's the voltage they put out which increases as you up the speed. If that's the case and you have the (...) (26 years ago, 25-Feb-99, to lugnet.trains)
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| | | | | Electrical Things (was: Railroad Dilemma) —Simon Robinson
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| | | | I finally got round to having a play with my controllers and my multimeter. PUTTING TWO CONTROLLERS ON THE SAME TRACK ---...--- Firstly, apologies to Ben, who suggested if you connect two controllers to the same track, then they'd short only if the (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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| | | | | | Re: Electrical Things (was: Railroad Dilemma) —Larry Pieniazek
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| | | | | (...) I'm not sure I agree that the voltage is variable. People have reported (via oscilloscope analysis) that it's pulse width modulated 9V instead. This will read on an analog meter like a low voltage, because it's taking the average across time. (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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| | | | | | | Re: Electrical Things (was: Railroad Dilemma) —Simon Robinson
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| | | | | | (...) If you have any URL's where people have reported on this, I'd be interested. (...) Yep - it was ohmmeter across unpowered moter. I did think about directly measuring the current with the motor running, but my multimeter has a maximum current (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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| | | | | | | | Re: Electrical Things (was: Railroad Dilemma) —Matthew Bates
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| | | | | | (...) 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... (URL) (...) Also not true. The resistance of the motor is not enough to determine the current it will draw (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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| | | | | | | | Re: Electrical Things (was: Railroad Dilemma) —Larry Pieniazek
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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 (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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| | | | | | | | Re: Electrical Things (was: Railroad Dilemma) —Matthew Bates
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| | | | | | (...) interested. (...) 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 (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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| | | | | | | | Re: Electrical Things (was: Railroad Dilemma) —Larry Pieniazek
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| | | | | | (...) But (pedant mode on) your wording in the post above does make that implication. ;-) (...) No fair. :-) That's a white box test. Much more fun to drag out a scope. OK, I give. (26 years ago, 9-Mar-99, to lugnet.trains)
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| | | | | | Re: Electrical Things (was: Railroad Dilemma) —Martin Legault
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| | | | (...) That is because there is a diode to protect from reverse voltage and the voltage drop is about 0.3V (...) The maximum current is about 0.7A MAXIMUM ( maximum voltage and whell not turning) with one controller (...) the internal resistance will (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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