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  • 1 Post By Ronald Roe

Thread: is this a mistake?

  1. #1
    Senior Member
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    Apr 2016
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    10 times

    is this a mistake?

    so I'm reading a boot that demonstrates how logic gates work but these two examples don't make sense to me (they use relays instead of transistors)


    How Computers Work: Memory: Page 7

    where power comes in at the bottom left corner, wouldn't just pressing switch b turn on light L? because it says In both b and a need to be switched on?
    I wont bother with the next one now that I think of it, answering this would answer the other one

    also I am referring to the top dagram on that page


  3. #2
    Senior Member Ronald Roe's Avatar
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    Mar 2011
    Oklahoma City
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    959 times
    Relay DB isn't connected to power unless DA is also closed. P0 is always hot, and A0 & B0 are only hot when the button is pressed. A0 and B0 apply power to their respective relay coils, pulling the arm down and closing the circuit. In the case of L, power must pass from P0 thru DA, into and thru DB to get to L.
    busso likes this.
    Ron Roe
    Web Developer
    "If every app were designed using the same design template, oh wait...Bootstrap."

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