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HS50 trigger for beamax electric??

Discussion in 'Projectors, Screens & Video Processors' started by Jules, Jun 20, 2005.

  1. Jules

    Well-known Member

    Oct 11, 2000
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    There are 4 wires coming from my beamax electric screen, and I've connected this up successfully to the supplied 3-position rocker switch.
    From what I can see, the screen effectively has 2 circuits (up and down) where the rocker switches the live connection to either of the 2 circuits or a central 'neither' position.

    I've looked on here and found a couple of posts about building a circuit for just a few pounds that will allow the 12v trigger from a projector (such as my Sony HS50) to close each circuit alternately upon powering on/off the projector.

    The problem is I don't really know what the 12v trigger from the projector will be doing...... is it providing a constant 12v supply, or just a 12v burst when switched on or off?
    And... how can you make a single 12v circuit from the projector control what is effectively 2 circuits on the screen. Is it a polarity thing?

    Can anyone explain to me in laymans terms how this whole trigger thing works, how to build the circuit and a rough idea of how much it will cost to build it.

    I'm ok with a soldering iron and not afraid to try, but I do need some help.
    I don't want to end up sending 240 volts back to the projectors 12v trigger socket!


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