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Thread: Powering relay from the chirp of the built in PC speaker

  1. #1
    FLAC PURDooM's Avatar
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    Powering relay from the chirp of the built in PC speaker

    Is there a way I could power a relay, that say turns on the LCD display, by the chirp on the PC speaker? What kind of voltage would I expect is going to the speaker, and would I need to get something else than an auto relay?

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    FLAC evandude's Avatar
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    why would you want to do that?

    and bear in mind, the PC speaker would be getting a modulated (audio frequency) signal, not a simple digital on/off signal so it would take some circuitry to do anything useful with it...
    But don't take it from me! here's a quote from a real, live newbie:
    Quote Originally Posted by Viscouse
    I am learning buttloads just by searching on this forum. I've learned 2 big things so far: 1-it's been done before, and 2-if it hasn't, there is a way to do it.
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    Maximum Bitrate neon_eddy's Avatar
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    I use a similar thing.. O used the 12v line off of the PSU to power a relay to power the LCD, however I wanted more of a delay, the tview likes more to let the alternator stabilize, so now I use the amp turn-on from the m1-atx

    but the 12v off the PSU seemed to work fine,
    Shawn



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    FLAC PURDooM's Avatar
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    Quote Originally Posted by evandude
    why would you want to do that?

    and bear in mind, the PC speaker would be getting a modulated (audio frequency) signal, not a simple digital on/off signal so it would take some circuitry to do anything useful with it...
    For exactly the reason the next guy says, it powers on the TView with a delay. Its nice because it happens right after the POST and before resuming windows.

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    Wiredwrx's Avatar
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    Quote Originally Posted by PURDooM
    Is there a way I could power a relay, that say turns on the LCD display, by the chirp on the PC speaker? What kind of voltage would I expect is going to the speaker, and would I need to get something else than an auto relay?

    Why not get a voltmeter and check the voltage? That will tell you how much voltage you get, and wether it is possible, and what voltage relay youwil need.

    I am not sure how that speaker works, although, I tend to think that it is not voltage controled like a car alarm speaker, but more of an "actual" speaker.

    Michael

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    Variable Bitrate fuctup's Avatar
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    i think this is a good idea, i think my motherboard manual said the case speaker output is somthing like 5 or 8 volts

  7. #7
    Constant Bitrate
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    i have tview too and anti-thump on my m1-atx doesnt work. i made this and autopoweron is ok (the timebox is adjustable rellay,i set up it to -+7sec delay). http://www.daj.cz/p11_dash/kkk.jpg

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