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Help with Bill Bowden Game Show Who's First Circuit

Discussion in 'Electronic Basics' started by Ariel Suero, Jun 22, 2013.

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  1. Ariel Suero

    Ariel Suero Guest

    I really need your help. I embarked on assembling one of the circuits posted on the page, specifically the Game Show Who’s First Circuit. I purchased the parts and put it together to what I understand is correct. Here is what I’m seeing.

    With a setup of a total of 6 stations, but with only 2 connected for test.

    1.The relay clicks to trigger the buzzer.
    2.When a button is pushed, it turns on it’s corresponding light.
    3.The reset switch works.
    4.I added a power switch, which does route power to the circuit or not.
    5.Added a fuse to the system before the reset switch.

    Problem: When station button is pushed a 2nd can also power it’s light. Essentially it isn’t locking out the other stations.

    I tried checking if maybe the button pushes were too close together in timing that it might light both, but with delay in between pushes the test setup lights either way.

    Does it need the minimum 3 stations in order to work properly? I suspect that it shouldn’t matter how many stations are wired it should still lock them out. If you could please give me some guidance it would be greatly appreciated. I’m kind of stuck and not sure where to proceed.

    Thank you

  2. Ariel Suero

    Ariel Suero Guest

    So, after carefully reviewing the schematic and my circuit, I found that the resistor that should link the SCRs was not wired correctly. I suppose long nights setting up this system and tending to a 9 month old scrambled my brain. Thanks to all!!!
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