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  1. 3kids

    tally control device

    Can anyone draw me diagram for tally control for a video switcher. The tally output is a 15 pin D-sub connector. Pins 1 through 8 are correspondents to each input of the switcher. Ex: camera 1 triggers the out of pin 1 of the tally output. It uses an open collector circuit for each pin. these...

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