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555 Timer, Astable Oscillator Help

Discussion in 'Electronic Basics' started by Gifters, Nov 6, 2007.

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  1. Gifters

    Gifters Guest

    I'm trying to use a 555 timer to output a specific frequency for an
    indefinite period of time, no more than a minute, for the application
    I need it to output 2 signals at about 28 hertz (with some fine
    tunning) independent of each other, I have a circuits I setup (that I
    found online) now that seems to work fine except its running in the 3
    to 6 hertz range it seems to output both at the same frequency for an
    indefinite amount of time, I'm new to 555 timers and I've tried
    looking online for equations but I'm failing to see relation between
    their circuit and my circuit, here is link to a diagram of the circuit
    I have

    Thanks for your help in advance

  2. John Fields

    John Fields Guest

    If you want two separate output frequencies you'll need to use two
    separate timers wired as astables, and if you want to have them both
    running/stopped for the same time you'll need another timer wired as
    a monostable in order to do that.

    What's the range of trim you require for the 28Hz, and what's the
    range of ON time you need?
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