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switch 2 VGA outputs from laptops to one projector

Discussion in 'General Electronics Discussion' started by kad_911, Apr 26, 2014.

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  1. kad_911

    kad_911

    5
    2
    Apr 26, 2014
    hi,
    I'm trying to build a device that can switch between two computers into a projector.
    The output from one computer will be displayed from the projector. but when I switch, the other computer output should be connected to the projector. Is there any way to achieve this?
    (Not talking about buying a KVM switch or anything. I want this to be home made DIY)
    I DONT want a keyboard and mouse to control both computers. I just want to switch the output to the projector from either of the computers.

    here's a representation of what i want.
    Please help me how to build this switch.

    cd.jpg

    thank you.
     
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,267
    Nov 28, 2011
    Yes, that IS a KVM switch. You just don't use the keyboard and mouse switches.

    You can make one yourself with a multi-pole rotary switch. You can also use multiplexer ICs. But it's cheapest and simplest to buy one.
     
  3. kad_911

    kad_911

    5
    2
    Apr 26, 2014
    its not really cheap here to buy one. thats Y im asking to build 1 myself. We cant even find a multi-pole Rotary switch here!!

    Thank you for your reply.
     
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,267
    Nov 28, 2011
  5. kad_911

    kad_911

    5
    2
    Apr 26, 2014
    Thanx.
    Can u tell me how to get a kind of a switch that will switch more than one line at once?
    I mean for this I atleast have to switch 6 lines from 1 button. Is this possible?
     
  6. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,267
    Nov 28, 2011
    Yes, it's called a rotary switch. These can be expanded by adding wafers, to switch dozens of signals.

    Here's a suitable 8-pole one at Digikey: http://www.digikey.com/product-detail/en/C4D0806N-A/451-1022-ND/514076

    That one is USD 37.00 which I think is pretty expensive for a rotary switch. No doubt it's good quality though. But you may be able to find one locally, and that link will show you what to look for.
     
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