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Author Topic: Another Coach Lighting Question  (Read 368 times)

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Offline JonHarbour

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Another Coach Lighting Question
« on: August 02, 2017, 06:10:24 am »
Was looking for a means to wire up button batteries and came across this:

Heat Shrink Coin Button Battery Holder

At the same time, I'm trying to figure out a way of switching the lights on or off. I looked at the DCC Concepts flicker free set up, but found that  the pickups created too much drag on my coaches. I've basically come to the conclusion that it is very difficult to achieve the nirvana of reliable electrical picky-up from the track and free running, so I'm now looking at battery power.

If I were to use Reed switches:

  • Would the switches be small enough to fit inside the coach with the battery and the lighting circuit?
  • How does the switch get switched on and off?

Thanks in advance!
Still planning a layout...

Offline Bealman

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Re: Another Coach Lighting Question
« Reply #1 on: August 02, 2017, 06:48:20 am »
To the best of my knowledge, a reed switch operates by a magnet, but take it away, and it will open again. Hence it is momentary contact. Some sort of latching circuit or device would be necessary.

But I will stand corrected!
Vision over visibility. Bono, U2.

Online njee20

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Re: Another Coach Lighting Question
« Reply #2 on: August 02, 2017, 06:57:41 am »
You can get latching reed switches, which could work. You'd need a magnet on a stick or something to switch them on/off.

Offline JonHarbour

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Re: Another Coach Lighting Question
« Reply #3 on: August 02, 2017, 07:19:15 am »
Just bought a few on E-Bay will let you know how I get on....
Still planning a layout...

Offline geoffc

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Re: Another Coach Lighting Question
« Reply #4 on: August 02, 2017, 10:23:56 am »
I looked into using latching reed switches but found that they were expensive, plus from what I read unreliable and liable to break easily. I ended up using a double acting latching relay which was switched on and off by two normal momentry reed switches using a magnetic wand. The only problem was battery life, when the battery was low they would not switch off. The relay was Kemet EE2-3TNU-L from Farnel.

Geoff

Offline Bealman

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Re: Another Coach Lighting Question
« Reply #5 on: August 02, 2017, 10:30:11 am »
But will all this fit into an N gauge coach?  :hmmm:
Vision over visibility. Bono, U2.

Offline Rob H

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Re: Another Coach Lighting Question
« Reply #6 on: August 02, 2017, 10:32:57 am »
Just bought a few on E-Bay will let you know how I get on....

Unfortunately these are not easily available in the UK and not on eBay - I bought a quantity a while ago from a guy on USA eBay but he doesn't seem to be around at the moment.

They do work, with a magnet on the end of a rod, but are VERY fragile to work with when installing.

Rob.
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Offline Rob H

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Re: Another Coach Lighting Question
« Reply #7 on: August 02, 2017, 10:34:04 am »
But will all this fit into an N gauge coach?  :hmmm:

Very easily, using button batteries and very fine wire,

Rob
They say that love is more important than money but have you ever tried to pay a bill with a hug ?

Offline geoffc

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Re: Another Coach Lighting Question
« Reply #8 on: August 02, 2017, 10:41:08 am »
But will all this fit into an N gauge coach?  :hmmm:

I fitted it into a Farish Mk3 to run the tail lights, I dont think it would work in coaches with seats in them, having said that the Dapol ones have factory fitted sockets to plug in light boards.

Geoff

Offline Rob H

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Re: Another Coach Lighting Question
« Reply #9 on: August 02, 2017, 12:23:09 pm »
But will all this fit into an N gauge coach?  :hmmm:

I fitted it into a Farish Mk3 to run the tail lights, I dont think it would work in coaches with seats in them, having said that the Dapol ones have factory fitted sockets to plug in light boards.

Geoff

I've fitted them to Farish coaches but to be fair they needed a bit of "fettling" required, so if you want to keep your coaches pristine it won't work,

Rob.
They say that love is more important than money but have you ever tried to pay a bill with a hug ?

Offline themadhippy

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Re: Another Coach Lighting Question
« Reply #10 on: August 02, 2017, 04:07:13 pm »
Instead of latching relays try using a thyristor,much smaller and cheaper than a relay and widely available

Offline Mito

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Re: Another Coach Lighting Question
« Reply #11 on: August 02, 2017, 09:24:30 pm »
For the electronically challenged can you explain the circuit and give some values please?
You know you're getting older when your mind makes commitments your body can't meet.

Offline themadhippy

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Re: Another Coach Lighting Question
« Reply #12 on: August 02, 2017, 10:44:46 pm »
A thyristor will pass current between the anode and cathode  when a small current is applied to the gate terminal and will remain  conducting whilst  theres a current flowing between the anode and cathode even if the gate current is  removed.So press s1 and the light comes on,let it go and light stays on,to turn off the light press and release s2,replace s1 and s2 with read switches or other  types of momentary action switches.As for values that depends on the type of thyristor you use ,the supply voltage,the current required for the led and forward voltage of the led.

Offline Rob H

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Re: Another Coach Lighting Question
« Reply #13 on: August 03, 2017, 07:54:42 am »
A thyristor will pass current between the anode and cathode  when a small current is applied to the gate terminal and will remain  conducting whilst  theres a current flowing between the anode and cathode even if the gate current is  removed.So press s1 and the light comes on,let it go and light stays on,to turn off the light press and release s2,replace s1 and s2 with read switches or other  types of momentary action switches.As for values that depends on the type of thyristor you use ,the supply voltage,the current required for the led and forward voltage of the led.

So that clears that up - NOT !!
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Online njee20

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Re: Another Coach Lighting Question
« Reply #14 on: August 03, 2017, 11:05:18 am »
There's a limit to how much you can dumb things down!

Imagine you have a reed switch at each end of the coach - swiping a magnet over one end will illuminate the lights, swiping the other will extinguish them. They are represented by PTM switch 1 and PTM switch 2 in the diagram.

Values of resistor will depend on how bright you want the lights.

 

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