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Search: Posts Made By: gregc
Forum: DCC Forum (Digital Command Control) Yesterday, 01:45 PM
Replies: 23
Views: 352
Posted By gregc
not too expensive, but takes quite a few steps to...

not too expensive, but takes quite a few steps to rotate one time

https://i.imgur.com/FUEJcIt.jpg
Forum: General Model Train Discussion Yesterday, 09:36 AM
Replies: 33
Views: 517
Posted By gregc
it's not surprising that models are not very...

it's not surprising that models are not very accurate for specific railroads considering that steam locomotives were often unique to a single railroad but models were sold with various railroad...
Forum: DCC Forum (Digital Command Control) Yesterday, 09:30 AM
Replies: 23
Views: 352
Posted By gregc
i found motors with encoders boards on ebay...

i found motors with encoders boards on ebay (https://www.ebay.com/itm/130-Motor-DC6V-12V-7800RPM-Metal-Speed-Encoder-Tachometer-Motor-AB-Phase-EF/293143757827) for ~1$. I mounted the encoder on a...
Forum: DCC Forum (Digital Command Control) Yesterday, 07:15 AM
Replies: 23
Views: 352
Posted By gregc
you might be interested in encoders...

you might be interested in encoders...
Forum: DCC Forum (Digital Command Control) 11-20-2019, 09:08 PM
Replies: 23
Views: 352
Posted By gregc
1/10, 1/100, 1/1000 ?

1/10, 1/100, 1/1000 ?
Forum: DCC Forum (Digital Command Control) 11-20-2019, 02:16 PM
Replies: 23
Views: 352
Posted By gregc
how long did it take to make a measurement and...

how long did it take to make a measurement and was the motor unpowered (i.e. coasting) during that time.
Forum: DCC Forum (Digital Command Control) 11-20-2019, 02:09 PM
Replies: 23
Views: 352
Posted By gregc
what do you mean audible? why do you think it...

what do you mean audible? why do you think it is audible?



i believe the jerki-ness is the result of multiple locos coupled together and influencing each other. In this case, the motor...
Forum: DCC Forum (Digital Command Control) 11-20-2019, 01:41 PM
Replies: 23
Views: 352
Posted By gregc
can you explain this lag? presumably you...

can you explain this lag?

presumably you know the speed setting commanded over DCC, you have a measure of speed (BEMF) and a motor voltage (PWM) setting. you compare (or subtract) the measured...
Forum: DCC Forum (Digital Command Control) 11-20-2019, 12:26 PM
Replies: 23
Views: 352
Posted By gregc
i think just a few msec, if that. enough time...

i think just a few msec, if that. enough time to disable (set to zero) the PWM output voltage, read an ADC and restore PWM
Forum: General Model Train Discussion 11-18-2019, 06:18 PM
Replies: 14
Views: 306
Posted By gregc
bear in mind that the NMRA's support for LCC,...

bear in mind that the NMRA's support for LCC, supports separating control of locomotives from other I/O (e.g. detection, turnouts, signals).

so an automated train control system 1) interfaces to...
Forum: General Model Train Discussion 11-17-2019, 05:23 AM
Replies: 14
Views: 306
Posted By gregc
while having software able to control a train is...

while having software able to control a train is certainly needed, detecting the location of trains is also required.

on the layout i'm familiar with (http://www.pacificsouthern.org/), there might...
Forum: HO Scale 11-15-2019, 04:16 AM
Replies: 3
Views: 164
Posted By gregc
my table is correct, my statement it wrong. i'll...

my table is correct, my statement it wrong. i'll correct it
thanks
Forum: HO Scale 11-14-2019, 05:06 AM
Replies: 3
Views: 164
Posted By gregc
the NMRA guideline for HO is 1 oz plus 0.5 oz per...

the NMRA guideline for HO is 1 oz plus 0.5 oz per 1" (corrected) of length

ft inch oz
30 4.14 3.07
35 4.83 3.41
40 5.52 3.76
45 6.21 4.10
...
Forum: HO Scale 11-13-2019, 05:44 AM
Replies: 6
Views: 194
Posted By gregc
try using a potentiometer to adjust the LED to...

try using a potentiometer to adjust the LED to the desired brightness (liminosity) at the voltage you plan on operating then at and measuring the potentiometer resistance. (start with the pot in the...
Forum: HO Scale 11-12-2019, 10:27 AM
Replies: 14
Views: 469
Posted By gregc
you could run a separate bus around the layout...

you could run a separate bus around the layout for lighting and connect to it using suitcase connectors...
Forum: HO Scale 11-11-2019, 11:12 AM
Replies: 11
Views: 369
Posted By gregc
if magnets are mounted under the ties, in an...

if magnets are mounted under the ties, in an opening in the benchwork, couldn't they be mechanically lowered and raised as needed?
Forum: DCC Forum (Digital Command Control) 11-10-2019, 02:11 PM
Replies: 23
Views: 352
Posted By gregc
back EMF momentarily stops providing power to the...

back EMF momentarily stops providing power to the motor in order to measure the voltage (EMF) generated by the motor. BEMF is a measure of the motor rpm.

in this mode, the decoder drives the...
Forum: DCC Forum (Digital Command Control) 11-10-2019, 06:12 AM
Replies: 23
Views: 352
Posted By gregc
isn't this a momentum issue?

isn't this a momentum issue?
Forum: HO Scale 11-09-2019, 07:27 PM
Replies: 11
Views: 369
Posted By gregc
the layout i visited used rare earth magnets...

the layout i visited used rare earth magnets under the ties
Forum: HO Scale 11-09-2019, 04:28 AM
Replies: 11
Views: 369
Posted By gregc
i just visited a layout and thought they were...

i just visited a layout and thought they were mounted under the ties, out of site
Forum: Technical Model Train Forum 11-05-2019, 03:06 PM
Replies: 4
Views: 134
Posted By gregc
what limits the current thru the zener? maybe a...

what limits the current thru the zener? maybe a regulator
Forum: Technical Model Train Forum 11-05-2019, 01:11 PM
Replies: 4
Views: 134
Posted By gregc
how electronic savy are you?

how electronic savy are you?
Forum: DCC Forum (Digital Command Control) 11-04-2019, 08:41 PM
Replies: 7
Views: 224
Posted By gregc
try "8" to toggle sound

try "8" to toggle sound
Forum: HO Scale 11-04-2019, 06:00 AM
Replies: 17
Views: 540
Posted By gregc
you might first evaluate the shape of your...

you might first evaluate the shape of your layout. consider Why waste space on a 4x8? (https://www.layoutvision.com/why-waste-the-space-on-a-4x8) and

https://i.imgur.com/ijpb5Ha.jpg

or...
Forum: General Model Train Discussion 11-04-2019, 05:54 AM
Replies: 6
Views: 306
Posted By gregc
may be too late to consider: layout vision...

may be too late to consider: layout vision (https://www.layoutvision.com/why-waste-the-space-on-a-4x8). check out the rest of the site
Showing results 1 to 25 of 877

 
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