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From The 'Toeffelholm' Laboratory For Weird Technology ...
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 Posted: Sun Dec 30th, 2018 03:38 pm
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Toeffelholm
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A friend has built this 7/8th scale loco from a kit and I equipped it with DelTang R.C.





Now it should get some improvements concerning on-switch, charging and battery.


The Cat-Switch

The loco is equipped with an Rx62.
 
The DelTang users among you know that an Rx62 is switched on by an electronic switch (eSwitch),
that means only a momentary trigger is needed by shortly connecting the R pads on the Rx62 board.

Initially I installed the usual Reed-switch.
But activating an invisibly installed Reed with the magnet seemed to be sometimes a bit tricky.

As surely each momentary switch can be used for this task, I ordered such nice tiny SMD push button switches:




I drilled a hole through the drivers cab floor,
soldered the wires from the RX62’s R-pads and mounted the switch through the hole under the floor.





Then I placed the drivers cat - with a strip of double-sided on half of the cat - back to the floor and half over the switch.
Now, with a slight push on the cat, the loco is switched on. 





A cat-switch:bg:


Juergen


Last edited on Fri Jul 12th, 2019 01:22 pm by Toeffelholm



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modelling in 1:22.5 on 32mm and 16.5mm track
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 Posted: Sun Dec 30th, 2018 04:22 pm
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Rick Dow
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Well, lets face it, we all love the Cat Switch.

Very cool Juergen!





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 Posted: Sun Dec 30th, 2018 10:09 pm
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bobquincy
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My wife and I like it so much that I now have to add a Cat Switch to one of my monorails. :)

boB



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 Posted: Mon Dec 31st, 2018 02:04 am
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Rick Dow
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Bob when I read the first five words of your post, I was expecting you to say you two got rid of the house cat. 

Nice Guy Eddie thought so too.





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 Posted: Mon Dec 31st, 2018 03:27 am
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Nice Guy Eddie
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" Nice Guy Eddie thought so too "


? Clearly psychic

I must have totally missed what Rick thinked I thought

In fact I hadnt thought Id thinked anything at all ?


:f:


Eddie




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 Posted: Mon Dec 31st, 2018 07:51 am
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corv8
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Hmmm.... any ideas where I can get suitable HO cats? 



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 Posted: Mon Dec 31st, 2018 02:35 pm
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bobquincy
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HO cats (and dogs) from Woodland Scenics! 

One of our cats never misses taking a swat at a monorail as it goes by,
maybe if the monorail has a cat switch they will leave it alone out of professional courtesy.

...and maybe the monorail will sprout wings and fly...   ;)




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 Posted: Sat Jan 5th, 2019 08:46 am
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Toeffelholm
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LiFePo4 Battery


As there is enough space available, this 7/8th loco is equipped with LiFePo4 batteries, simply fixed with hot glue.

Here 2 round cells of 14500 type are used.
Same size as normal AA batteries. Each 3,2V and 600mAh.
Energy density does not reach a LiPo, so more Volume with same capacity.

They need a LiFePo charging procedure, and shouldn't be charged with LiPo settings.
On my chargers I can choose between LiPo or LiFePo charging.










These are said to be more robust than LiPo cells and more insensitive to deep discharge, overcharge and heat.

Also they are regarded to be inherently safe with no risk of fire.
Not that I ever had an issue of fire or explosion in my over 10 years of using LiPo’s, but it occurs that inflate and died.

Some surely because I have forgotten to switch off the loco and the quiescent current of the Rx caused a deep discharge.
But some also of reason I couldn’t explain.

As far as I have researched there is a fair variation of production quality.
Also LiPo packs long time not used or loaded, can be deep discharged, one cell inflated and dead, the others still completely OK.

I want to use these LiFePo4 in our 7/8th locos, and will see what experience will show. 

Juergen




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Actual project: 7/8" scale on 45 mm track
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 Posted: Sun Jan 6th, 2019 04:13 am
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W C Greene
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Love the kitty...sort of "cat-a-tonic".

Woodie



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 Posted: Sun Jan 6th, 2019 02:45 pm
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Toeffelholm
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Magnet Charger


For charging the batteries I installed a special charging jack.
Some of you may know this magnetic charging devices normally used for charging your cellphones.
But basically it is just a four wire cable with an USB plug on one side, and a micro USB on the other,
magnetically connected to the cable end.





I bought micro USB sockets mounted on circuit boards, where the magnetic plug can be pushed into.


 


The wires from the 2 cell LiFePo4 are soldered to the socket board.
Three wires here, for enabling balanced charging. 


 


My friend wanted to have the charging socket under the drivers seat.
So it’s mounted into a piece of wood and placed under the seat.
It’s placed that way, that it is halfway hidden behind the drivers leg in normal sitting position.










We have simple chargers for 2 to 3 cells LiPo or LifePo4, simply choosable with a switch under the charger.
The connector cable for the charger got an USB socket at the other end,
soldering the charger wires to the ports matching to the micro USB socket in the loco. 

So now you only have to hold the magnetic plug near to the locos charging socket, and it is fixed in the right position.
Doesn’t matter which way around, as it has the same polarity, independent from which side of the plug is up/down.





For balanced charging I need a magnetic charging device without status LED on it,
as the additional current disturbs the charging process, and my charger refuses charging.


Juergen




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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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