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Questions On Installing My 'DelTang' R.C. Gear ?
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 Posted: Mon Jan 29th, 2018 03:31 am
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Rick Dow
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@ Toeffelholm

Hi Jurgen,  you mentioned:  So using only the balancer plug of the lipo, need to build a special connector cable, using a balancer connection cord fitting to your charger and splitting the outer wires of the balancing cord to an additional 2-wire plug that also fits in your charger. Thats why I ask what charger you have.  

  Thanks for this info. Much appreciated.  

I am using a HITEC Mini X1   

This is knowledge I not only didn't have, but probably also an example of what is NOT available yet on YouTube etc. but I assume will be.

Is this special Balancing Chord something you have made up yourself or is it commercially available?  

The charging wires leading from the charger to the battery are typically thicker gauge, than are the two outside wires of the Balancing Chord. Is this a factor?   Can I simply splice into the two outside wires on the balancing chord, add pin connectors and just plug them into the charging ports on the charger?

Hope I made sense there.

Rick

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 Posted: Mon Jan 29th, 2018 03:38 am
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Rick Dow
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@ Davecttr     

 Thanks Dave, you said:  That middle wire on a 2 cell batteries set of 3 wires is actually connected to the positive on one battery and the negative in the other giving you a 2S 7.4 battery.

Makes total sense. 

Thank You.   Plus thanks for the additional advice.

Rick

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 Posted: Mon Jan 29th, 2018 04:29 am
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John Durbetaki
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Rick - you were asking about Reed Switches. There is such a beast as a latching reed switch. They are spendy little things,  over $10 each at Mouser in small quantities. To see it and the datasheet - goto http://www.mouser.com and look for   KSK-1E66  - they had 65 in stock when I looked it up writing this.

I didn't see any at Digikey or Newark or Jameco, so they aren't widely distributed.

I have not seen your circuit, but if it were me, I would think of simple momentary reed switches and latching relays rather than latching reed switches, because I can get a spdt, dpdt, 3pdt, or 4pdt latching relay in a choice of voltages and 2A contacts and have much more clever circuitry...

John



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 Posted: Mon Jan 29th, 2018 05:17 am
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Rick Dow
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@John Durbetaki

    Hi John, Thanks for the info

    You mentioned:  .....but if it were me, I would think of simple momentary reed switches and latching relays rather than latching reed switches, because I can get a spdt, dpdt, 3pdt, or 4pdt latching relay in a choice of voltages and 2A contacts and have much more clever circuitry

If you get a moment, can you send me the co-ordinates for sourcing and purchase of a Latching Relay?  

I believe this type of Magnetic Off/On switch is what I have seen before, especially on the BlueRail YouTube video description of their impressive Plug and Play unit.

But it would be very helpful to get info on where and how to order them.

Thanks

Rick

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 Posted: Mon Jan 29th, 2018 05:54 am
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W C Greene
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The magnetic reed switches from Mouser...$25 USD for 10...just 2.50 each that way. I used them many years ago on my On20 locos, I had no blocks, etc. on my DC layout and I could turn one loco on and the others stayed off. Easy for me. I began using them again because I got tired of needing to pick up a loco each time I wanted to turn it on/off. Makes (my) life much easier.

Woodie



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 Posted: Mon Jan 29th, 2018 06:23 am
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Bob R
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Rick,
An option would be to use a DelTang RX62 receiver.  They have a built in electronic switch that is triggered by a reed switch.  The reed switch is included with the receiver.  Wave the magnet over the reed switch to turn it on and wave it over again to turn it off.



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 Posted: Mon Jan 29th, 2018 07:39 am
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Rick Dow
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Thanks Bob

    Makes me feel like a dummy - but a very happy one. 

I have already ordered and taken delivery of three Rx 61 receivers and transmitters to go along with them. So, looks like I'll just submit another order for the replacement RX62 receivers. 

This info completely solves another problem.
  
Thank you for touching base on this topic, Bob. 

I have looked up the data on the RX62 at the Micron web site and these Rx62 receivers with the built -in reed switch, are the same dimensions as the Rx 61's.  

Amazing really, when taken as a whole, the added info I've received here today.

Rick 

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 Posted: Mon Jan 29th, 2018 07:53 am
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dan3192
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Rick, referring to your first post, you may want to consider, now or later, a battery management board for protection and the 2S battery balancing you are looking for. I am taking this alternate approach for the BPRC project I am working on since it is also compatible with the wireless charging part of the project.
  



These boards are available on eBay from several suppliers under the category "rechargeable batteries". They fit HO Scale units and are inexpensive (approx. $2+).

In this scenario, the board is wired between the batteries and a double throw switch, which selects power for the voltage regulator and receiver or for battery charging. Only two wires are needed for 2S balance charging or 3S balance charging using a similar board. 

In effect, balancing, over voltage protection and over discharge protection are all done on-board, and an external balance charger is not required. For 2S charging, you would need to provide 8.4V-9V via a plug-in connection.

I am taking this further and using the Qi Standard for magnetic induction charging. I have most of the parts needed. When completed, I should be able to position an engine over a charging coil in the track and directly charge the on-board batteries.

I hope this provides some additional food for thought. On-board charging is an appreciated feature for battery powered trains.

Dan     

  
 

Last edited on Mon Jan 29th, 2018 11:03 pm by dan3192

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 Posted: Mon Jan 29th, 2018 11:32 am
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John Durbetaki
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Rick - when I go shopping for components, I go online, been doing it that way for a long time. Digikey http://www.digikey.com and Mouser http://www.mouser.com are my first places to go. Prices are almost exactly the same, so you might save a few pennies at most from one to the other. The difference is that one might have parts and the other might have others. Knowing which parts are "better" requires reading datasheets and understanding your application.

If I don't find parts at Mouser or Digikey, I will try Newark http://www.newark.com (you can see the pattern...) and then I might go to Arrow or Avnet or Allied, but those are more for production quantities when I was doing board runs. Personally, if I have to hunt to hard for parts, then a different solution is better.

So finding a latching relay is pretty easy - goto http://www.mouser.com and in the search box, enter latching relay which then shows a bunch of results and pick Relays under Electromechanical and there are 13,416 results

On the next screen, pick dual coil latching and latching under Coil Type and click In Stock in the box above Category and then click Apply Filters and we now have 727 results

From here - you can narrow down the search with Coil Voltage, Contact Form, Contact Current, etc. Depends on what you are doing.

I like dual coil latching relays best. There are two coils and you energize one to set the relay and energize the other to reset the relay. Plain Latching relays require reversing the polarity of the latching signal, which for what I would use them for in this kind of circuit, it tricky wiring. With a dual coil, we put one reed switch to set and another to reset (one on one side and one on the other for example) and once the relay is thrown, we can remove the magnet that closed the reed switch...




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 Posted: Mon Jan 29th, 2018 11:39 am
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John Durbetaki
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Forgot to comment on Reed Switches. There are a number of SPST choices and some as cheap as $0.20 if you buy them in 100 quantity and some with a datasheet for $0.395 at 100 quantity.

Mouser and Digikey have different switches and the prices look pretty good at either - happy shopping...



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