Results 1 to 5 of 5
  1. #1
    Forum Moderator
    Join Date
    Nov 2008
    Location
    Essex / EGMC
    Posts
    2,104
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Can someone tell me the difference please.

    Hi

    I need to purchase a 6 position rotary switch for my generic EFIS controller that I am building but I am confused between the 2 types of switch.

    What is the difference between make before break switches and break before make?

    Based on this answer which type of switch is required for an EFIS selector switch?

    I hope someone can help.

    Thanks.

    Alex
    Building An Airbus In My Garage!

  2. #2
    150+ Forum Groupie


    jonesthesoftware's Avatar
    Join Date
    Jul 2009
    Location
    aberdare, south wales UK
    Posts
    276
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Can someone tell me the difference please.

    It's all about how the contacts are switched as you rotate the shaft/knob. Use break before make as it opens the one contact before closing the next contact. This ensures that you don't have 2 inputs of the same switch on at the same time which could confuse your software. Other thing to think about with rotary switches is the number of channels of that switch e.g 12 way rotary can be purchased as 1 common x12 positions or 2x6 or 3 x4. The most useful for cockpits is 1x12 where each click can be used as a separate input whereas 3x4 can only be used as 4 separate inputs but 3 channels are made simultaneously. Hope I haven't confused with that explanation.
    regards
    geoff

  3. #3
    Forum Moderator
    Join Date
    Nov 2008
    Location
    Essex / EGMC
    Posts
    2,104
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Can someone tell me the difference please.

    Thanks for your explanation, it makes sense now. I was just trying to work out what physically happens during switching of the 2 types. Again thanks for your help much appreciated.

    Alex
    Building An Airbus In My Garage!

  4. #4
    150+ Forum Groupie
    Join Date
    Oct 2010
    Location
    Australia
    Posts
    166
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Can someone tell me the difference please.

    Hi Alex,

    Just one other important thing to remember is the degree between positions. Either 30 Degrees or 45 Degrees depending on what type of panel you use. Some companies sell panels with either angle.

    Kind Regards

    Bernie.
    E8400 @ 3.0GHz, DDR2 Ram 800MHz 4Gb, Vista Home Premium 64Bit, MSI 9800GT @ 512Mb, Philips 22" LCD Widescreen, Cockpit Setup X 5 using Wideview and Widetraffic.

  5. #5
    Forum Moderator
    Join Date
    Nov 2008
    Location
    Essex / EGMC
    Posts
    2,104
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Can someone tell me the difference please.

    Quote Originally Posted by Bernie View Post
    Hi Alex,

    Just one other important thing to remember is the degree between positions. Either 30 Degrees or 45 Degrees depending on what type of panel you use. Some companies sell panels with either angle.

    Kind Regards

    Bernie.
    Thanks for that. Yes I will remember that and bear in mind when purchasing. Thanks. Alex
    Building An Airbus In My Garage!