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Old 13-05-2016, 03:40 PM   #21
Teedoubleudee
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Like I said in my first reply, post #2, I find the idea of a latching relay interesting enough to purchase a few. So if enough others (now's your chance) are likewise interested and someone wants to place a bulk order from the states to keep post costs reasonable.........?
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Old 14-05-2016, 07:38 AM   #22
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I recall reading another thread (somewhere on here) recently about the automated switching on/off of coach lighting. I believe it was for OO and utilised a photoelectric sensor in the carriage roof. I don't know whether such a system could be employed in N gauge - or for that matter whether it would be suited to a battery powered setup, but it could be worth exploring.
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Old 14-05-2016, 11:31 AM   #23
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Using a reed switch and latching relays you could switch coach lighting on/off with a magnet swiped over the reed switch.
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Old 09-07-2016, 12:14 PM   #24
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Default Latching Reed Switches

Layouts4u can now supply latching reed switches.
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Old 28-07-2016, 08:16 PM   #25
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Quote:
Originally Posted by Layouts4u View Post
Layouts4u can now supply latching reed switches.
I've just fitted 3 of the four that I ordered and they work well.
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Old 28-07-2016, 08:43 PM   #26
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Quote:
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I've just fitted 3 of the four that I ordered and they work well.
Am I right in understanding you have to present opposite polarities to the relay to set and unset it?
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Old 28-07-2016, 09:40 PM   #27
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Quote:
Originally Posted by Teedoubleudee View Post
Am I right in understanding you have to present opposite polarities to the relay to set and unset it?
Only on latching relays that have one coil. Polarity is applied one way to latch and reversed to unlatch.
Dual coiled latching relays have positive polarity applied to either the latch or the unlatch coil. The two coils other ends are linked together and connect to the negative usually
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Old 29-07-2016, 01:14 AM   #28
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Quote:
Originally Posted by Flashbang View Post
Only on latching relays that have one coil. Polarity is applied one way to latch and reversed to unlatch.
Dual coiled latching relays have positive polarity applied to either the latch or the unlatch coil. The two coils other ends are linked together and connect to the negative usually
Ok, not seen one of those (dual coils). I'm trying to imagine how you present the magnet so it only trips one coil - are they at opposite ends or such like?
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Old 29-07-2016, 09:37 AM   #29
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Quote:
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Ok, not seen one of those (dual coils). I'm trying to imagine how you present the magnet so it only trips one coil - are they at opposite ends or such like?
FB is talking about latching relays not reed switches
for the reed switch yes one pole of the magnet will activate it and the other will release.
so you need one magnet for on and one for off, the advantage is that they can pass the 'on' magnet again and not change state,

latching relays have three terminals for control, a common ground, a set and a reset but hold the last position (bi-stable) when power isn't applied

the latching reed switch would provide a basic occupation sensor as you could have train arrive on magnet at the front and then at the rear the off would perhaps allow a simple way of showing when a train has cleared a feature
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Old 29-07-2016, 10:45 AM   #30
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Sorry, just noted you're meaning Latching Reed switches operated by a magnet. Not latching relays! Ignore my ramblings on Latching relays!

Yes and as stated, reversing the magnetic pole causes the latching reed switch to either latch or unlatch
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