
Steve
steve howe wrote:Didn't the MMRS also produce one at sometime?
garethashenden wrote:We had this problem with Empire Mills. The small 12V power supplies provide 12V, but not very many amps. We substituted a bigger (laptop style) power supply and it's been quite reliable ever since.
steve howe wrote:garethashenden wrote:We had this problem with Empire Mills. The small 12V power supplies provide 12V, but not very many amps. We substituted a bigger (laptop style) power supply and it's been quite reliable ever since.
I have been using a plug-in transformer I got from Maplins which has 7 settings from 3v up to 12v to power the magnets on my bit of test track, I checked the rating tonight and it says "100 - 240v 60/50Hz 0.16A" being electrically illiterate, that does not sound like much amp to me...?
I see from MRJ 223 that Chris Pendlenton uses 24v for his magnets.
shipbadger wrote:I must admit that when I wound my own electtromagnets ....
steve howe wrote:Looking at adding electro magnetic uncouplers to my current Roseladden project which will probably need about 8, plus some permanent magnets.
As only one train is likely to be moving at any time, I am wondering, in the interests of simplicity of wiring, if it is possible or feasible to operate the magnets with one push button switch, rather than locating individual switches on the panel diagram. It would mean of course all the magnets energise simultaneously, but with only one train in motion I don't see this as being a difficulty. I'm just not sure if the current draw would be too great?
You don't have to run two wires to each uncoupler however, I've had success with a common wire going to all of them. Wire one side of all the push buttons together, then run that wire to one side of all the uncouplers. Then run individual wires from each push button to the corresponding uncoupler.
steve howe wrote:Thanks for the clarification Keith, I will try that approach,
Dingham does his own magnets, I have found them very good and robust.
The uncoupler coils would ideally need a reverse diode across the coils to stop the back-emf pulse when turning off, but this is good practise for a single coil when fed with a DC supply.
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