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Purchased a 'FlySky' FS-GT2E Transmitter & Receiver
 Moderated by: W C Greene Page:  First Page Previous Page  1  2  3  4  5  6  7  8  Next Page Last Page  
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 Posted: Mon Nov 13th, 2017 08:15 pm
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Si.
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Hi Phil :wave:



Although MOST of our models, whatever the scale, are designed to operate on 12 Volts ...

... MOST of them will run like the 'Bullet Train' with the full amount of juice ! :shocked:

So.

In my opinion stepping-up to 12 Volts, in many cases, is not really needed.



For my stuff at least, everything I am likely to want to R.C. ...

... should run fine between 7.4 to 9.0 Volts maximum.

Giving respectively, the option of 2-LiPos & no regulator, OR 1-LiPo & a 9 Volt 'step-up regulator'.


L:


On your 3-cell battery situation Phil. :brill:

I bought two E.S.C.s, both the smallest & cheapest I could get on eBay, at about 3-4 Bucks a pop inc. P&P.

Of course there are LOADS of others available as well, very cheap also, just often a tad bigger in physical size.



The reason your E.S.C. hasn't BLOWN-UP  :shocked:  yet with an 11.1 Volt 3-cell battery ...

... is probably because it may well have sufficient overhead not to do so.

Having said that, as with ALL electronics, higher heat = shorter life.

But we COULD be talking about 100s to 1000s of hours of OK life here.



There are TWO things of consideration here :-

The 5-Volt regulator which is built into the E.S.C only has to power it's own small circuit + the receiver.

Both of which require minimal power, there are not even loads of servos connected to the receiver.

Cos it ain't having to deal with an overly high-current draw, it can probably stand the 11.1 Volt input.



The 2nd thing is that since the 4 big power-chips on the back of the E.S.C. are designed for 10 Amps ...

... and your load is way, way lower than that for sure, they are likely to survive 11.1 Volts also.



If that E.S.C. was $50 Bucks worth of kit, my shorts would have changed colour by now !

But personally I can afford another £2.54p inc. P&P if I blow mine up !!

So as Clint Eastwood said ...

... " Do you feel lucky punk ? " :w:



:)



Si.



There are LOADS of DC-DC 'step-up regulators' on eBay, just as good & way, way cheaper than 'Pololu'.

There are tons of fixed voltages to choose from & also adjustable ones.



The main criteria for choice being ...

... How much current it needs to deal with & if it's corresponding physical size is OK for the install.



I am wondering at the moment on my install whether to use one or not.

Seems to me though, that unless you absolutely have no room available & simply MUST use a 1-cell LiPo ...

... a 2-cell LiPo stetup, sans regulator, in my case & probably many other cases, is the way to go generally.


:old dude:





:!:




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http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
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 Posted: Mon Nov 13th, 2017 08:27 pm
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davecttr
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I use a lot of Pololu regulators, mostly 9V which give good top speeds with most of my locos. If the fully loaded loco draws about 300mA or less you can use a single 3.7V lipo with conversion efficiencies of 80% or better. If you need more than 9V or the loco draws more than about 300mA go for a 7.4V 2S lipo which can have conversion efficiencies of 90%

If you want to consist a couple of locos a regulator is needed to give a consistent voltage as lipos have a output ranging from a freshly charged 4.2V to a depleted 3V, obviously making speed matching difficult.

Last edited on Mon Nov 13th, 2017 08:30 pm by davecttr



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 Posted: Mon Nov 13th, 2017 10:05 pm
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bobquincy
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@Si
"There are LOADS of DC-DC 'step-up regulators' on eBay, just as good & way, way cheaper than 'Pololu'."

We have to be careful about these converters.  I bought some nice ones from company "A" and they worked well but a sudden overload (stalled motor) smoked them.  Their technical person said the inductor gets saturated and can destroy the switches, adding that there is no way to protect against this.

Company "P"'s converters just shut down in similar situations and recover after the load is reduced to zero and started up again.

Ymmv, as always,

boB



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 Posted: Tue Nov 14th, 2017 01:19 am
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Si.
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These are the 'step-up regulators' I bought from Company 'C'






DC-DC 'step-up regulator' 9 Volt output.







DC-DC 'step-up regulator' variable Voltage.



Phil, the ones I bought were for smallish 16.5mm gauge projects.

I'm guessing if you use a regulator, which I don't think you need to, it would need to be a bit bigger.

2-cell operation, sans regulator, is probably your ideal option.



I believe most of the 'regulator guys' have small locos & are using them with 1-cell batteries, due to limited space.

I chose the highest current available, before the PCB size became too big.

Somewhat of a guessing game perhaps, but the specs. are mostly all in the eBay listings.

At about $0.50c per board inc. P&P, I aint gonna argue too much about the fine-print !



Most modern regulator semiconductor devices have built in protection for any number of things ...

... including over-current, short-circuit etc.

These are all simple pieces of electronics squirted out of the same sausage-machine in China.

The expensive ones at 10x the price come with a nice 'logo' on ...

... & probably an expensive 12 month all inclusive money back guarantee.

If mine blows up, I'll just have to cough up another $0.50c for a new one.



:!:



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: Tue Nov 14th, 2017 01:53 am
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bobquincy
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As I found, the converters are not all the same and the electronics are not all protected. I don't mind the $0.50 if one blows up, it's the taking the model apart to replace it that gets annoying.
I sell models with these converters buried inside and really do not want one frying in a customer's model, then I have to repair it *and* feel like I should pay postage both ways as well.

I decide to use the components I know will work, so far I have had no complaints!



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 Posted: Tue Nov 14th, 2017 11:31 am
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Helmut
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Pololu seems to have the smallest footprint for 9V@300mA. There are some Chinese boards around, albeit a tad larger. I have used the 9V-stepup+supercap in a TT-scale loco, a battery may even be smaller depending on the capacity. You may distribute two or more of them wired in parallel, in the shell where convenient.



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 Posted: Tue Nov 14th, 2017 08:18 pm
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Si.
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" A question about these low cost alternatives. Are there any small enough to fit in 00 scale locos and leave room for the batteries? "



Hi Dave :wave:



There are a TON of these lil' boards on eBay around $0.50c a go.

They all use the same basic technology & chips/inductors etc.

There are some incredibly teeeny-weeny ones about if one looks.



Bob mentioned being worried about the good-value for money regulators blowing-up !

Some details in a photo from Helmuts link ^^ above.





This one is made by 'Canton Power', logo like a 'copyright-symbol'.

They pretty much make 'em all !





My ones I posted on the last << Page are also made by 'Canton Power' using the same parts.

They look incredibly easy to solder to, with nice holes/pads & plenty of tinning on the PCB.



:)



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: Tue Nov 14th, 2017 10:02 pm
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W C Greene
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Si, are these ESC/Receivers and do they have PROPORTIONAL SPEED CONTROL forward & reverse?

Woodie



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 Posted: Wed Nov 15th, 2017 12:15 am
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davecttr
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I checked online Woodie and they are voltage regulators. I should have been clearer with my original question. I was thinking of the receiver and ESC.



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 Posted: Wed Nov 15th, 2017 01:35 pm
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Si.
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" Si, are these ESC/Receivers and do they have PROPORTIONAL SPEED CONTROL forward & reverse? "



Howdy Woodie :cb:



NO they aren't, and NO they don't.



:f::f::f::f::f:



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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