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Thread: DCDC-USB 200 info

  1. #1
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    DCDC-USB 200 info

    Anybody know if Vaux on DCDC-USB 200 can be used as remote on delayed 12 V signal to enable car amplifier(Ďanti-thumpí control that will keep your amp OFF while the PC starts) after the car pc is started, in order to avoid the big pop noise on the speakers when carpc starts?

    Thanks

  2. #2
    FLAC SNOtwistR's Avatar
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    I would think you need that Vaux line to go to a relay and if you want a delay you would also need a timer of some sort. That Vaux just is an output not an amp trigger. Maybe OldSpark will chime in with a simple circuit for you. SNO

  3. #3
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    Thanks,
    In the advanced user manual of DCDC-USB 200 is indicated that this VAUX can be programmed to come on after a time you setup with the help of an integrated software through an USB port and I was wondering if this can be used to trigger on an amp after a certain amount of time programmed to do so ?
    What do you think?

  4. #4
    FLAC SNOtwistR's Avatar
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    Well give it a try and see if you can get the timing you need on the bench and implement once you have it right. SNO

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    Thanks very much for the advice, though if anybody already did it - is good to know before buying the DCDC-USB 200

    ...even though I think there are not so many alternatives on the market for this kind of power supply - single rail and also having intelligent automotive mode based on ignition status...

  6. #6
    Maximum Bitrate rray's Avatar
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    I bought 2 of the DCDC-USB model down from the 200, but same features. I have not used the script feature or AUX, but I use the "Automotive Mode" jumber and use the "PWR" pins to turn on my motherboard power and the "Vout" to run my motherboard and screen. With the other DCDC-USB I hav, I use it to power my screen only, as these are great little DCDC converters for keeping the voltage constant and use very little current when in sleep mode (ignition off).

  7. #7
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    And what solution did you use to delay your car amp power on from carpc start in order to avoid the big pop noise ?
    From interference point of view do you have any issue with your DAB radio , as I heard that M4-ATX induces a lot of interference noises ?
    Thanks very much for the info

  8. #8
    Maximum Bitrate rray's Avatar
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    I had a very small amp pop on my first carpc, but it was not loud because my amps are fed by a MS-8 processor, and that's fed by a USB DAC, so there really was no thump due to the extremely clean signal path.

    On the carpc I am using now, it has the M2-ATX supply which has an amp remote turnout that I use. The DCDC-USB is only to power the screen, so i'm not using the feature at this time. I am real happy with that DC-DC converter though, and would be using one inside the PC case if my motherboard ran off a single voltage like the last one did.

  9. #9
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    This is my case - I have a thin mini itx intel haswell mainboard with a 12V or 19V DC input and I plan to use the DCDC-USB 200 PSU and I really need to find a solution for the amp remote turn on.
    What about interference , do you have any in your system?

  10. #10
    Maximum Bitrate rray's Avatar
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    I would just go ahead and get the DCDC-USB 200 PSU and bench setup the script watching leds connected to vout vaux and pws signals to see how it responds. I am sure you can set the delay to whatever you need to get into windows before the amps turn on.

    As far as interference, these DCDC-USB boards are not bad. Mine never caused noise.

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