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Thread: Dimmer Switches???

  1. #21
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    Quote Originally Posted by wombat457 View Post
    Jeff or anyone,

    Any idea what the "Plugs" might be called?
    I believe they are 2-Pin Female JST XH-Style plugs, which look like this:


    Don't confuse them with the very similar-looking PH-style plugs!

    In a very quich search, I found a place to buy the plugs, with wires attached:

    https://www.pololu.com/product/1164

    I have no experience with this vendor, and I expect the plugs are available from many other sources.

    It's worth noting the the standard power supply for the WS system is a 24VDC, 1A wall transformer which WS says "powers up to 50 Light Hub Ports."

    Mind you, I am using nothing but WS products with my hubs, but I can't see why there would be a problem using your own wiring and LEDs.

    - Jeff

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  3. #22
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    Dimensions:



    - Jeff

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    Yeah, I can't imagine this being a "specialty WS Plug" either. I don't have any of the plugs/leads, what I posted was just a picture of them that I found sorry.

    To me, they look like the plug on the end of my NCE cable that goes into the Controller.

    - - - Updated - - -

    Jeff,

    Thanks mate that helps a lot!
    Cheers Tony

    "Knowing what to do is one thing ... being able to do it is another"
    "It is easy to criticize ... a lot harder when you have to justify it"

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    Thanks for the info and link. If I do go this route, I will get the WS Power Supply as well, just to be safe.

    As for the wiring compatibility, I recall (accidentally) buying an N Scale WS Just Plug Station for my wife some time back. I did cut the plug off of that and connected my own resistor and wires for it to be connected to a DC controller. So, based on that coincidence I also can't see why I can't use the Hub along with my own wiring and resistors.
    Cheers Tony

    "Knowing what to do is one thing ... being able to do it is another"
    "It is easy to criticize ... a lot harder when you have to justify it"

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    0.1 spacing of the pins?

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    Quote Originally Posted by kingmeow View Post
    0.1 spacing of the pins?
    I have not measured the plugs myself, but according to one web site I visited, the JST XH-Style plugs have a 0.1-inch pin spacing. They mentioned the plugs were compatible with 0.1-inch headers.

    - Jeff

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    Then it's very common. R/C guys that use lipos to fly their planes (me! ) have JST XH plugs on their battery for the balance port for charging. You can easily find these on eBay, Banggood, Hobby King or perhaps even Amazon.

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    Where is a source for these plugs? I'm thinking about buying a WS lighted building and wanted to light using the 12 volt transformer I already have. Or can I just strip the wire? I appreciate any help you can offer.

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    Quote Originally Posted by Champsummers View Post
    Where is a source for these plugs? I'm thinking about buying a WS lighted building and wanted to light using the 12 volt transformer I already have. Or can I just strip the wire? I appreciate any help you can offer.
    If you are using the WS lights then you will need to either use their Hub or solder in a resistor. It appears WS put the resistors in the Hub. You can power their Hub with either 2 9 volt batteries or up to 24 VDC power supply. You should be able to use a 12VDC supply, but the lights might be a bit dimmer than usual. They likely have a 18-24 VDC resistor installed in the Hub.

    In terms of the individual LED’s there is nothing special about them. Just normal LED’s so handle them like you would any other LED.

  14. #30
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    Quote Originally Posted by dave68124 View Post
    They likely have a 18-24 VDC resistor installed in the Hub.
    Hi Dave -

    What is a "18-24 VDC resistor?" Ordinary 1/4-watt and 1/2-watt carbon and carbon-film resistors typically have voltage ratings in the hundreds of volts. In this sort of low-voltage application, we might be concerned about the power rating (1/4-watt, 1/2-watt, etc.) of the resistors, but their voltage rating is rarely an issue.

    Or is there some sort of specialized resistors with an unusually low maximum voltage being employed by Woodland Scenics?

    - Jeff

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    Quote Originally Posted by jdetray View Post
    Hi Dave -

    What is a "18-24 VDC resistor?" Ordinary 1/4-watt and 1/2-watt carbon and carbon-film resistors typically have voltage ratings in the hundreds of volts. In this sort of low-voltage application, we might be concerned about the power rating (1/4-watt, 1/2-watt, etc.) of the resistors, but their voltage rating is rarely an issue.

    Or is there some sort of specialized resistors with an unusually low maximum voltage being employed by Woodland Scenics?

    - Jeff
    You are right, I should have done the math v. going off of memory. However, if I use a single LED with 2 volt forward and 20 MA for 18 and 24 VDC source, the calculator indicates a 1/8W resistor with either 8,200 ohms or 12,000 ohms. Since the WS Hub is rated up to 24VDV it should have protection up to that level.

    Regardless, if he doesn’t use the WS Hub then he just needs to drop in the appropriate resistor for his LED and power source.

    Here is a link to a calculator. http://led.linear1.org/1led.wiz

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    Just getting caught up on this thread. do you want to vary the brightness frequently, or do you just want to adjust the brightness and set it once? If the latter, and you're not afraid of a little messing with LCC, the Signal LCC board from RR-Cirkits can turn LEDs on and off and you can adjust the output of individual lamps. The LED drivers will handle a couple of white LEDs in series and can be turned on and off individually through LCC events.

    This may be a little deeper in the weeds than you are looking for.
    Tim Rumph
    Modeling the Southern Railway in N-Scale

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    Wow, great thread. Potentiometer is basically a variable resistor. So, if using LED's, you'd want to have a resistor to limit the voltage to it's maximum 'safe' level (most will blow out at 12V and are MUCH happier at around 4-5 volts, which is why they're often sold with resistors), then have the potentiometer in-line after that to variably trim it from that point to points lower including zero. A on-off switch at the front of it would control if the circuit was hot or not. I'm no electronics genius, but this should work... I don't know the value of potentiometer one would want for such a thing, maybe someone else can pipe in.

    Here's a helpful bit that I found about this:

    https://www.electronics-tutorials.ws...ntiometer.html

  18. #34
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    Quote Originally Posted by P-LineSoo View Post
    So, if using LED's, you'd want to have a resistor to limit the voltage to it's maximum 'safe' level ...
    No. The resistor in an LED circuit is used to limit CURRENT, not voltage. Here is a handy online calculator to help you determine the value of the current-limiting resistor for circuits with one or many LEDs:

    http://ledcalc.com/

    - Jeff

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