 | | Electrical Things (was: Railroad Dilemma)
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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)
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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)
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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)
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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)
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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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| | 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 (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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| | Re: Electrical Things (was: Railroad Dilemma)
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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)
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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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