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Powering an amp and tablet

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  • Powering an amp and tablet

    Hello, im working on a project where i intend to mount a tablet instead of my head unit and run audio to an amp. I Have the amp wiring understood but im wondering if i can power the tablet from the 12v switched wire or if i need a power supply or run it to the battery.

    The tablet requires 5v and 2000ma. If i use a 12v-5v DC-DC converter, will i be able to power the tablet and send a signal to the amp using the 12v switched wire?

    Sent from my GT-I9100 using Tapatalk 2

  • #2
    i was going to recommend a 5v relay to provide the turn-on wire, though i don't see why you can't use the cars 'acc' wire in the oem harness. the only benefit the relay would provide would be that it would be off the tablets power supply.. but as i understand it, that method wouldn't provide any extra functionality(tablet-on sensing or anything), it'd just be a more expensive method to turning on the amps when the car is turned on..
    My OLD 2001 Mitsubishi Eclipse GT:
    "The Project That Never Ended, until it did"


    next project? subaru brz
    carpc undecided

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    • #3
      Yeah, the point of viring the tablet to the switched wire is to run power to it when the car is started, and not otherwise. But does the 12v sw wire carry enough amps to power the tablet and send a signal to the amp?

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      • #4
        Noting that that's different to using a 12V relay to turn on the dc-dc converter for the tablet...

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        • #5
          Originally posted by SynGates View Post
          Yeah, the point of viring the tablet to the switched wire is to run power to it when the car is started, and not otherwise. But does the 12v sw wire carry enough amps to power the tablet and send a signal to the amp?
          as long as it's a newer style amp, then yes-- in most cases, the acc wire is going to be rated/fused for a maximum of a 10A load. typically amps will draw about 0.5A max on the turn-on wire(there was a older mid 80-90's amp model that drew huge amounts of power on the remote wire..), and tablets via usb can not require any more then 2.0A(part of that new usb certification for high power devices).. so your entire system shouldn't see any more then 2.5A draw on the acc wire.
          My OLD 2001 Mitsubishi Eclipse GT:
          "The Project That Never Ended, until it did"


          next project? subaru brz
          carpc undecided

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          • #6
            Quick thought: is there anything against taking the 12v for main power to the amp from the 12v wire in the head unit harness? Instead of taking power straight from the battery.

            Since I will be using the 12v sw to power the tablet, nothing else will draw current from 12v main wire.

            Sent from my GT-I9505 using Tapatalk 2

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            • #7
              Only the current limit, voltage drop, and line noise.

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              • #8
                Ive gone with another approach. Thank you

                Sent from my GT-I9505 using Tapatalk 2

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