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Radio Control Handsets For Analogue Locos
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 Posted: Tue Apr 27th, 2021 07:56 am
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fallen
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Si. mentioned bench testing.

I have a small rig for testing locos or chassis for radio control.
It consists of a box that connects to a short test track,
it is a piece of new track that I wipe clean occasionally.

The box has two Li-Pos, a couple of switches, and push button.
It also has a meter that measures current.
(you could use a digital multimeter or similar and plug it in)

One of the switches selects either one or two Li-Pos,
and the other reverses the polarity to the track.
The push button connects the power to the track.

This setup allows you to try a loco or chassis,
to see how it runs with one or two Li-Po cells driving it,
in particular how fast it runs and what current it takes.

It's a pretty good indication of if the loco can be converted to R.C.
and if it needs one or two cells to drive it.
And a non-destructive test, if you see a loco for sale at an exhibition,
you can just try it on the track, no need to take anything apart.

Frank


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 Posted: Tue Apr 27th, 2021 11:24 pm
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Bob Walker
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PWM is a digital construct.



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 Posted: Wed Apr 28th, 2021 05:37 pm
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Helmut
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Okay, now we can all dive into lexical semantics -
What the word 'analogue' means in context with control of electrical motors,
and whether it's appropriate to use the term when describing,
a variable voltage that is only defined by its mean value.

In other words -
Is it woke to use something generated discretely,
make it appear smooth, and then call it so?




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 Posted: Tue May 4th, 2021 06:50 am
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Steve Soar
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I have not been a member of Freerails for very long,
so might frequently post stuff which has already been discussed.


So you may already know that PWM is ideal for loco LED lights.
 
Front and rear LEDs are connected in inverse-parallel,
so that the front LED only comes on when traveling forwards,
and the reverse LED only comes on when traveling in reverse. 

A 2k2 resistor limits the LEDs current,
the PWM supply to the motor is connected across LEDs and resistor.  

At low running speeds,
the LED seems brighter than if supplied from low DC voltage,
this is due to our eyes persistence of vision.   


Regards
Steve


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 Posted: Tue May 4th, 2021 10:29 am
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Helmut
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It is always advisable to browse through the related topics on this Board,
before one re-invents the wheel (happened to me, too).

I think this thread should only deal with the radio controlling of the track voltage.


Of course, when using PWM and LEDs, almost constant lighting can be achieved easily:





And when using the ROKUHAN ( addition: RC-02/03 ) controller,
constant lighting is even possible at standstill,
without using any additional circuitry in vehicles.


@Steve

An adaption of the principle used there in conjunction with a remote,
would fit well in this thread IMHO.




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 Posted: Fri May 7th, 2021 02:19 pm
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Steve Soar
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Hi

Thanks for the schematic looks good,
knocked it together and it works well. 

The simple circuit I described does work quite well,
and gives a good light.

Yes it does dim a bit at creep speeds,
otherwise it's not bad at all.
 

Regards
Steve

  

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