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Old 12-05-2016, 09:39 AM   #1
4VEP
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Default Latching reed switch?

May 2016 issue of Railway Modeller has a feature on page 420 entitled "Coach lighting in N gauge". Tim Williams suggests a method to turn battery powered lighting on or off using a latching reed switch.

The article explains a normal reed switch is only on when the magnet is near, but with a latching reed switch it remains on until the magnet passes a second time.

There is a photo in the article which shows the assembly which he uses to switch on an LED lighting bar. A latching reed switch is inside a glass vial and looks the same as an ordinary reed switch.

The only drawback is that these switches are unobtainable in the UK. At the end of the article he says "Hopefully this article will inspire a trader to offer these very useful switches in the UK." They can be obtained via ebay.com (USA). No use going to ebay.co.uk - that only stocks ordinary reed switches.

These type of switches would be useful for solving several problems posted on this forum. Anybody got any comments?
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Old 12-05-2016, 10:00 AM   #2
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Well I don't know if any of our members are bona fide traders that could put in a bulk order and resell them to us. I would certainly be interested in buying some.
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Old 12-05-2016, 10:00 AM   #3
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OK for low current applications. But if they are unavailable here seems a bit pointless this side of the Atlantic! Unless any individual is willing to import a few.

I guess you could use Latching Hall effect sensors to so a similar job? They only need a couple of components added to work, and then one pole latches and the other pole unlatches. This little video shows the three main types of use - The middle one would be the ideal for coach lighting control etc.... YT video of Hall effect sensors
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Old 12-05-2016, 10:22 AM   #4
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I found this on the web , it may or may not help https://www.google.co.uk/url?sa=t&rc...OZ_z9VbY2OuNMg
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Old 12-05-2016, 11:21 AM   #5
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There are a few companies now stock various types of reed switches...

http://www.cricklewoodelectronics.co...nWIaAsli8P8HAQ
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Old 12-05-2016, 11:55 AM   #6
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There are some here from China that might do the trick - but having got some of the non-latching ones (different Chinese supplier) I'm not convinced they are worth the effort of putting on your layout. I had 20 (I think) of which 2 broke as soon as I picked them up, several others are intermittent as to whether they will come on or not with the same magnet, distance etc - and another comes on but won't go off. Rapidonline stock some at around 54p. When I have discarded this lot I might try some of theirs. R-
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Old 12-05-2016, 01:54 PM   #7
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All you need is one of these whose coils are activated by two N.O. reed switches. First reed switches the lights on and second switches them off - simples

Can draw you a circuit if wanted.
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Old 12-05-2016, 02:14 PM   #8
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That link TWD is taking me to "no longer available" page. R-
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Old 12-05-2016, 02:22 PM   #9
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Quote:
Originally Posted by RogerB View Post
That link TWD is taking me to "no longer available" page. R-
Try THIS one Roger. 5 for a tenner, cheapest I've found on eBay
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Old 12-05-2016, 02:50 PM   #10
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That's more better. R-
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