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Thread: Amplifier Control - Avoiding "Thump"

  1. #11
    Oms
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    Well, you should check, it could be that your GPS and/or phone communication software already lowers DTR when going into hibernation. Then you're all set, just tap into the DTR line in the connector somehow.
    Custom Linux system on an '89 VW GTI 16V Edition One
    Jogdial volume control, Sony joystick, IR remote...
    Used to be the fastest Linux on the road, until all these NOS types came along...

  2. #12
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    I'll take a look at it tonight!

  3. #13
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    The remote switching wire for my amps is 12v - is the DTR on a serial port 12v?
    Best regards,

    Darren Thrower
    http://www.percyt.com/mp3player.htm

  4. #14
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    I think RS-232 is +?v-12v for high and -?v-12v for low. I would not like to connect the output directly to an amp, use an optocoupler or small relay buffered with a transistor. I like plenty of isolation in these situations. Gives you flexibility too.

  5. #15
    Oms
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    The RS-232 spec is +3V to +12V for high. Most motherboards produce 9-10V or so, which is high enough to activate the amp's remote turn-on.

    You can use a relay if it will make you feel better. I just put in a small fuse -- I feel there's not much that can go wrong with a serial line driver, apart from overloading it, which the fuse ought to protect from. The current draw of the amp's turn-on line ought to be very small, but check your specs.
    Custom Linux system on an '89 VW GTI 16V Edition One
    Jogdial volume control, Sony joystick, IR remote...
    Used to be the fastest Linux on the road, until all these NOS types came along...

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