 | | Re: 8475 -- a good buy
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(...) Am not!! (...) Were you using a geared 9v motor non loaded? If so, then it's not surprising that you noticed no difference. Try it with a load. I tried it with a weight at the end of an arm, and at one point on the controller it just buzzed, (...) (22 years ago, 28-Dec-02, to lugnet.org.ca.rtltoronto)
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| | 8475 -- motors and steering Oh My
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(...) Yes I was testing on an unloaded 9V geared motor. Thats how my RPM-o-Meter works best. (...) I just re-did this test and you are correct. when you load a geared motor (i put a 40t gear on the motor and put friction on the teeth) then you can (...) (22 years ago, 28-Dec-02, to lugnet.org.ca.rtltoronto)
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| | Re: 8475 -- motors and steering Oh My
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It is indeed PWM. I got out my oscilliscope and checked it, and here are the results I got: At setting 1 (closest to off): Th: 1ms Tl: 2ms Tt: 3ms 9Vpp At setting 2: Th: 2ms Tl: 1ms Tt: 3ms 9Vpp And at full on, it's just 9v DC. (...) (22 years ago, 29-Dec-02, to lugnet.org.ca.rtltoronto)
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| | Re: 8475 -- motors and steering Oh My
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(...) cool. Thanks Trevyn. now if only I had an O-scope and knew what Th, T1, and Tt meant?? ;) Chris (22 years ago, 29-Dec-02, to lugnet.org.ca.rtltoronto)
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| | Re: 8475 -- motors and steering Oh My
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(...) It doesn't matter. DMM's are not good at measuring pulsed signals. (unless you have one of the more expensive true-RMS meters which can calculate the average of a non-sinusoidal waveform. You really need an oscilloscope for this. (...) It will (...) (22 years ago, 30-Dec-02, to lugnet.org.ca.rtltoronto)
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| | Re: 8475 -- motors and steering Oh My
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(...) Th - Time signal is High Tl - Time signal is Low Tt - total time ------________ Th Tl <---- Tt --------> Matthias Jetleb P.S.: Th/Tt is defined as the duty cycle, expressed as a percent. Therefor: Th=2ms, Tt=3ms = 66% duty cycle. This is (...) (22 years ago, 30-Dec-02, to lugnet.org.ca.rtltoronto)
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| | Re: 8475 -- motors and steering Oh My
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Still no baby..... (...) umm, thanks Matt.... but I did put in the winky face after my last statement.... and since you did bring it up my DMM does do true RMS. that's why I have never felt the need for an o-scope. my electronics projects just don't (...) (22 years ago, 31-Dec-02, to lugnet.org.ca.rtltoronto)
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