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Time Delay

Discussion in 'Electronic Design' started by Niall 84, Dec 4, 2006.

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  1. Niall 84

    Niall 84 Guest

    I had a topic on this the other day but I dont think I was explaining
    what I want very well.

    I need a time delay system, about 5seconds.
    I need to input stereo audio and output stereo audio 5 seconds later.

    I need this circuit to run all day, even when there is no body near it
    to operate it, therefore I can not use any comuter programmes,
    It needs to be a physical circuit.

    Hopefully someone can help.


  2. Arlet

    Arlet Guest

    A computer doesn't need anybody near it.

    Just turn it on, attach the cables, run the loopback program on the
    sound card, and leave it. This is no different than any other hardware
    solution. You can even use a laptop that starts the software
    automatically when it's turned on.
  3. J.A. Legris

    J.A. Legris Guest

    This is not a project for a beginner. Got $1000? Just order 2 of these:
  4. If you weren't explaining it right, then you should return to that thread
    and make good there, not start yet another thread. It's your responsibility
    to explain yourself, not expect others to guess at what you want. And unless
    you participate in a thread, rather than just starting them and sitting
    back while the replies add up, then nobody will ever figure out what you

    And like too many questions here, this is not really a design question. It
    belongs in sci.electronics.basics which better suits your skill lelel (if
    you can't explain your problem well to begin with, then you certainly
    can't design something, because you need to be able to define a problem
    before you can design a solution). Posting there would also avoid the
    too often replies where people here are more interested in interacting
    with each other rather than to the original post, and at least in
    sci.electronics.basics people won't take your post literally and believe
    you to be capable simply because you posted here. A lot of times when
    people believe this is the place to post, for whatever reasons, they end
    up shooting themselves in the foot because it's not the place to get
    an answer they can use.

  5. Niall 84

    Niall 84 Guest

    THe problem is we don't always have a computer in the office. We have 2
    laptops, both of which are very often out on other jobs.
  6. Goog for "profanity delay", it's what radio stations use to prevent
    bad words on the radio during phone ins

  7. Niall 84

    Niall 84 Guest

    Yea the owl 10second delay!!!
    Thanks a lot.

  8. Tim Wescott

    Tim Wescott Guest

    You need a physical circuit, that can run all day? Well, that's what a
    computer is (at least if you don't ask Windows to do anything challenging).

    If you get paid for your time, if you're only going to need one, and if
    you don't have other constraints, the least expensive thing you can do
    is go buy another laptop and run the thing on that. Paint it green and
    refer to it as a 'circuit' if you must, but that's the way to go.


    Tim Wescott
    Wescott Design Services

    Posting from Google? See

    "Applied Control Theory for Embedded Systems" came out in April.
    See details at
  9. linnix

    linnix Guest

    I am not commending on whether you should do it or not, others will
    anyway. I assume that you are dealing with 48KHz dual channels 10
    bits. You need approx 256K buffers each. You can build it with a 18
    bits counter, 256Kx10x2 dual-port ram and dual 10 bits A2D. The parts
    could be less than a sound card, but the development cost could be more
    than a home threater system.
  10. That is not correct.
    A good PC with the right software will run as long as there is power.

    Else digitise, store in memory, read out at different address, DA,
    voila: SOUND!
  11. Rich Grise

    Rich Grise Guest

    I told you already. Get two tape decks, mount them to a stable surface
    such that they're at the same height and level to each other, and on
    the same stable base, mount one or an array of capstans, and run a
    continuous loop through it.

    Put a dust cover on top, and it will run unattended for months.

    Good Luck!
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