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Purchased A 'FlySky' FS-GT2E - Transmitter & Receiver
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 Posted: Tue Nov 14th, 2017 02:05 am
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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 05:19 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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 Posted: Tue Nov 14th, 2017 05:53 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 03:31 pm
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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: Wed Nov 15th, 2017 12:18 am
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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: Wed Nov 15th, 2017 02:02 am
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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 04:15 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 05:35 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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 Posted: Wed Nov 15th, 2017 05:44 pm
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Si.
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Hi Guys :wave:



Sorry, I thought you meant the DC-DC 'step-up regulators'.

Oh well, some useful info there ^ for someone anyhow perhaps.



I have some sizes measured from my components ...

... I'll Post something about the size of all these parts later.



Dimensions Of 'FlySky' Receiver, E.S.C. & Regulator



:!:



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: Wed Nov 15th, 2017 09:44 pm
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Bernd
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Time to get this thread back on track. (pun intended)
I finally have all the electronic products together.


I didn't realize you need two power supplies to power the ESC and the receiver.
I used the battery pack from All-Batteries, a 6 volt 1600mAh Ni/Mh pack for the receiver
and a 6 volt D cell battery holder to temporarily power the ESC.


I discovered that the switch with the wires on the receiver is an on/off power switch.
This makes the switch soldered to the circuit board the "brake on/off" switch.
I didn't see any difference in the motor with it in the on or off position.
Also hard to tell what is on and what is off.
No instructions comes with the Chinese ESC.


Here's a pic of all the equipment.





And a pic of the (from left to right) Receiver, battery pack & ESC.
It's sitting on an Athearn F7-B unit frame.
It'll all fit in the shell.





Next I'll need to modify the F7-A unit.
I've removed the Athearn 12 volt motor and will be replacing it with two 6 volt motors
driving a "ModelTorque Automatic Torque-control Coupling".


Bernd




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