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Dr. StrangeLiPo ... or How I Learned To Stop Worrying & Love The Battery !
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 Posted: Sat May 13th, 2017 09:03 pm
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Michael M
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Si,

I was looking at one of these transmitter/receiver, but not sure just how to hook it up.

27 MHz Tx. & Rx. Circuit Boards

I assume that I'll need an ESC also.  If I could figure out how it all goes together I might give it a try.

I was planning on using one of these RC tank for my upcoming rail car.

1:72 Scale R.C. Tank





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Nye, Inyo & Esmeralda Railroad
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 Posted: Sat May 13th, 2017 09:53 pm
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Si.
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Hi Michael :wave:



I do like to be positive & open minded about the possibilities of these things.

But I have to say, my feeling is, that neither of those options are gonna work out that good.



I looked at a similar pair of Tx. & Rx. boards in both 27MHz & 2.4GHz.

I also looked at a number of cars, which were based on the same, or similar, boards.

This is what my friends R.C. car that I had a go at a while back was run on as well.



These cars look like they have a double 'proportional' stick control.

But in fact, I believe this is a 'faux proportional control'.

In other words, they appear, to have only ONE forward or reverse speed.

You can see the simple sprung control-contacts on the Tx. board.

Basically just forward/backwards & full-left/full-right, by the looks of things.


The receiver board is also only capable of supplying 2 - 3.5 Volts to the motor.

It also looks like you would need to buy & solder in 'crystals', cos I don't see any included.



The tank looks like a similar situation.

A maximum supply to the motor of only 3 Volts, by the looks of things.

Also only ONE forward or reverse speed again.

Plus the added complication of it being a tank ...

... & turning left/right involves 2 motors, running in opposite directions, to achieve steering.



For around $20 bucks, you could get the 'FlySky' Tx. & Rx. twin-set.

For another $5 bucks ish, you could get an E.S.C, and 'this & that'.

You've already got a DC-DC 9 Volt step-up regulator ...

... and probably a battery or two, and a charger.


I think the 'FlySky' rig would take some beating on BOTH price & performance.

Which is why I'm going for it myself.

The modular components all have documented sizes & photos to go on as well.

Being seperate parts also, they could easily be installed in different parts of a model, should space be an issue.

It's all 'tried & tested' R.C. practice, and replacement parts are consistent & easy/cheap to get.



:moose:



Si.




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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Sat May 13th, 2017 10:28 pm
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Michael M
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This is why I ask the experts to save myself a lot of frustration. 

I'll check out the FlySky



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 Posted: Sat May 13th, 2017 10:48 pm
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Si.
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I thought I should say WHY I am still on the look out for some 27MHz gear.



To me it makes no difference whether a system is 27MHz, 35MHz, 40MHz, 2.4GHz etc. etc.



What interests me though, in an affordable 'analog system', eg. 27MHz A.M. ...

... is that an individual loco, is controlled by an individual 'crystal' or 'channel'.



With the 'FlySky' 2.4GHz 'digital system', you have the disadvantage of having to 'bind' a Tx. & Rx. together.

So it's not really possible to use the same transmitter, to control several locos, as needed.

Big-bucks systems allow this of course, but we aint got big-bucks to spend on such 'refinements'.



With an 'analog system', is seems to me that all one needs to do, to control several different locos ...

... is fit a different crystal/channel in each one ...

... the transmitter, which may only hold 1 crystal/channel at a time ...

... could fairly easily be modded. by adding a simple rotary-switch, with a crystal on each position.

Crystals & rotary-switches, are as cheap as it gets.

Switching locos, could be as easy as switching a dial on the modded analog controller.



I have no doubt that some more advanced 'analog' transmitters probably have this feature already built in.

I'm new to this jazz, so have not seen this, but it is a logical step, with such a straight forward non-digital device.



:!:



Si.



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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Sat May 13th, 2017 11:02 pm
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Michael M
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Is this what you had in mind?

http://www.ebay.com/itm/Flysky-FS-GT2B-2-4G-3CH-Transmitter-W-Battery-GR3E-Receiver-Radio-System-For-RC-/322163477666?hash=item4b02708ca2:g:39AAAOSwoBtW341m



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 Posted: Sun May 14th, 2017 12:48 am
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Si.
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Hi Michael :wave:


Yes it is, more or less.


I couldn't work out the shipping cost on your link, cos I didn't have a U.S. zip-code handy.

But, shipping was extra, & it seems like there are things in the deal you don't need, like a battery for example.

It did look to be coming from New York though, so might be worth a few bucks extra for speed.


I just very quickly found this one, which is in fact I think what I was looking at a few days ago.

FlySky Tx. & Rx. Twin-Set - $24.15c inc. P&P

This one doesn't include any extras, like batteries etc.


It is also a 2-channel transmitter, not a 3-channel like your link.

The cheap Flysky receivers, all seem to be 3-channel ones.

The difference appears to be, you either get a 2 or 3 channel transmitter.

The receiver will either operate as a 2 or 3 channel, depending on what is controlling it.


I didn't enter any specific code-numbers & stuff like that to search for it.

I just used the search-term 'FlySky Transmitter Receiver' ...

... and 'worldwide listings' then 'cheapest inc. P&P first'.


I found one the other day for about £19 U.K. pounds inc. P&P



:thumb:



Si.



When I find my £0.99p transmitter don't do $4!7 ... I'll probably have to buy one ! ;)




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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Sun May 14th, 2017 01:18 am
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Si.
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Hi again Michael :wave:


You may already know the answer to this.

But just a quick thought.


Perhaps that battery in your link is for the transmitter.

The deal came with what looked like a USB cable as well.


I was fairly sure that the one I was looking at, was powered by a 9 Volt, or some AAs.

Might be worth checking on that, for your favored battery type.


:bg:


Si.

 



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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Sun May 14th, 2017 04:29 pm
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Helmut
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The transmitter is powered by a 1S LiPo 3.7V. This is an advantage over earlier models, where the internal supply was 5V and so they had 6 or 8 1.5Vcells to operate it. ( They used standard 7805's to provide the logic's supply! ) A lot of useful energy was wasted this way. Nowadays all that internal stuff works on 3...3.3V, and the overall efficiency is higher - the battery lasts longer.
The receiver is tailored to operate off 5(-0.2/+1)V, because NiMHs are still standard in the R/C world.

Last edited on Sun May 14th, 2017 04:30 pm by Helmut



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 Posted: Mon May 15th, 2017 12:29 pm
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Si.
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This kind of information is exactly why I wanna keep Helmut on wages.

Don't worry Helmut ... The cheque is in the mail. ;)



I must say that those ol' 7805 3-pin regulators, are def. yesterdays tech.

Probably worth spending a few dollars more, for a 3.3 Volt microchip Tx. & battery.



:moose:



Si.



Helmut would hate my RED HOT vacuum-tube dropper-resistors ! :shocked:



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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Mon May 15th, 2017 03:01 pm
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Herb Kephart
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Si

A couple of comments

First, why do you have to control more than one loco at a time. I know that you come from the "instant decision" world of model car racing--but choo-choo's aren't like that.

Unless your racing trains. Put a discrete on off switch somewhere on the loco. You will need that anyway, or else you will be buying a lot of batteries. When the engineer (you) jumps down from the cab to change locos turn the switch off and turn the one on the second loco on, and do your thing. Just ONE frequency involved for the whole railroad.

There have been a couple times, that if a board were in two pieces, it would have made an installation a lot easier. I even considered sawing a board in half, to make things easier one time. Semi-rational thought came back just in time to prevent the almost surety of turning the whole thing into a dogs breakfast. Plus, Gromit said that he wasn't gona eat it anyway 

Herb



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