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  1. rgatlin

    need help with timer circuit

    I understand about using the 555 timer for different duty cycles, but I am not sure that I can get 2 seconds high, and 45 seconds low. That seems like a really long delay without using astronomical size resistors and cap. ??
  2. rgatlin

    need help with timer circuit

    New member and I need help bad!! I have a design project for class that requires a circuit to produce a 1kHz tone for 2 seconds, off for 45 seconds, on for 2....and so forth continuously. I need to keep it as simple as possible since we are only allowed to use components that are at the school...
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