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Thread: Power-on thump solution without needing a soldering iron?

  1. #1
    Variable Bitrate Grrrmachine's Avatar
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    Power-on thump solution without needing a soldering iron?

    Six hours, $10 of wasted parts and some badly burned thumbs later, I'm absolutely infuriated by the DTR-serial port solution to amp thump.

    I just cant get a signal through the transistor (a PN2222) to power a test light, relay or the amp remote itself. I've also tried just using a Bosch relay from the powersupply to the amp remote, but that doesn't give a suitable delay either.

    Is there any sort of 12V delay relay I can just crimp into my circuit? I understand basic wiring but electronics and clumsy fingers have really tested my patience this weekend.

  2. #2
    Constant Bitrate moboman's Avatar
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    What do you use now as an amp turn on?
    Does the opus 150 have amp turn-on? The M2-ATX does. With the m2 you just run a wire from this amp turn on to the amp turn on on the amp.

    One way to do it is just to take the positive 12v from your car, and run it right to the amp turn on. Then put a switch in this wire. That way when you turn on the switch, the amps turn on. When you turn off the switch, the amps turn off. this is what I plan on doing so that I can have my stereo on when the car is off. You could also put a relay in that if you like.

    I hope this helps.
    My Worklog
    I'm using my carputer 100%, but I still need to make it easier to use.

  3. #3
    Variable Bitrate Grrrmachine's Avatar
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    Yeah, at the moment I'm using a switch because the thump is unbearable (oldskool mosftet 2x120W amp!) The Opus doesn't have an amp switch (if it does, I haven't found it) so I'm looking at the PAC TR-4 switch or the Stinger Pop Stopper, but they're quite expensive to get shipped to Poland.

  4. #4
    Constant Bitrate moboman's Avatar
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    I'd offer to let you fly me to poland to solder that for you, but that would be more expensive than either the PAC or the Stinger pop stopper.
    My Worklog
    I'm using my carputer 100%, but I still need to make it easier to use.

  5. #5
    Variable Bitrate Grrrmachine's Avatar
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    Smile

    Hmmm, no, but maybe someone on here would solder me up a board and post it (I'd paypal them, of course!)

    So, if anyone wants to build 5-10 second delay circuit for me and can post to Poland, just let me know

  6. #6
    Low Bitrate
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    i just hit the mute button before turning the car off. That gets rid of the thump for me.

  7. #7
    Variable Bitrate Grrrmachine's Avatar
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    It's amp-thump when turning ON that's my problem!

  8. #8
    SD beats everything. So there. danielkh's Avatar
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    http://www.mp3car.com/vbulletin/car-...-carputer.html

    (XxAndyxX program) This route uses the DTR, but I found it very easy to use. And the power out of the serial port was enough to turn on both my amps. I just took an old serial cable, started up the program in this thread, cut the serial cable in half, Plugged the cable into a desktop, then found the pin that goes high when program is turned off and on. Cut and taped all the other wires back, then ran straightline to both amps (no board, trans,relays,etc.). Add the program to startup folder (amps won't turn on until windows is completely loaded and running).

    Still had thump on hibernate, but the last post should help you with that. Have no thump at all now.

  9. #9
    Constant Bitrate moboman's Avatar
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    Grrrmachine, which serial solution were you looking at?
    I finally hooked up mine and I now would rather do a serial amp power on rather than the power on from the m2.
    My Worklog
    I'm using my carputer 100%, but I still need to make it easier to use.

  10. #10
    Variable Bitrate Grrrmachine's Avatar
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    I've tried ALL of the above, that's why I really want a NON-DTR SOLUTION. I cut up a mouse, but my serial port doesn't pump out enough amps to trigger my amp remote (it requires more than plain DTR can produce.) I tried a transistor, then a relay, and they either don't switch the amp on or dont delay the circuit enough (i.e, one second!)

    I've just tried to solder a delay with a capacitor and resistor, but because my soldering skills are so poor, three attempts later just left a ruined mess of components.

    Im not using an M2, I'm using an Opus 150W. So PLEASE. NO DTR SUGGESTIONS - MY MOBO AND AMP WON'T WORK TOGETHER THAT WAY.

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