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Bulb dimmer circuit

Discussion in 'Electronic Basics' started by Grey, Oct 10, 2004.

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  1. Grey

    Grey Guest

    Suppose I have a TTL IC which has two outputs. I want to drive a small bulb
    with a transistor (example NPN BFY51) via a 12V rail.
    How hard would it be to drive the bulb so..

    If both o/p's = 0, bulb off
    output A = 1, bulb on
    output B = 1, bulb fades on over 1/2 sec.
    output B = 0, bulb fades off over 1/2 sec.

    output A+B would not be used.

  2. Brian

    Brian Guest

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