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  • Uninterrupted viewing of media player when restarting engine

    Hi PP'ers,

    I'm hoping to find a solution for a problem from all you electronics tech guys.

    I have a media player (Dvico R-2230) which has a 5V 1.5A power requirement. I run it off the cigarette lighter plug (using the appropriate 12V to 5V power adaptor). During our long drives, there comes a time for a toilet stop or fuel stop but the kids are still enjoying the movie. During these stops, I don't feel the urge to keep the engine running and waste fuel. So I switch it to accessory power and the media player keeps on going.

    When I restart the engine, the media player powers down and we lose the movie. You then wait for the media player to reboot, then navigate to the movie, and then fast forward to the point it was at.

    I thought about hooking up 4 NiMH batteries and a switch to the input but I'm not sure if the action of switching across will be quick enough to maintain power.

    Instead, I think I need to have a capacitor somewhere in the circuit. Can someone help me out with the circuit design?
    (I don't have dual batteries)

  • #2
    Re: Uninterrupted viewing of media player when restarting engine

    ...so I guess if accessory voltage is dropping when you crank over then a direct connection to the battery isn't going to work either ? (routed through the firewall grommets like UHF installs use).

    I think the best option for you is to get hold of one of those Supercheap Auto (or similar) jump start devices. The smaller one they do is a 12AH AGM battery and has a 12v socket, a 12v charge inlet, a light and a voltage meter - as well as the crocodile clips and fairly short (but 10amp looking) leads for a jump start. They are regularly on special for about $49 or so. They are very useful to have around. I used the light on one around the house during a blackout and I take it out on the boat as a backup power (and so the kids can watch a DVD on the boat or play their Nintendos...they don't have the patience to fish...). I primarily bought it though to power a telescope for dark sky bush camping trips (that's the only thing I haven't used it for yet though Can also be used to cheaply power 12v appliances during bush camp trips (charge it in the car during the day).
    '08 Prado Grande D4D Auto - [color=#800000]Flinders Red[/color], Piranha Dual Battery, GME 3440

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    • #3
      Re: Uninterrupted viewing of media player when restarting engine

      Originally posted by tileys
      ...so I guess if accessory voltage is dropping when you crank over then a direct connection to the battery isn't going to work either ? (routed through the firewall grommets like UHF installs use).
      direct connection to the battery will work but I do want the media player to turn off when I turn off accessory power. If we forget to run off the media player and it is connected directly to the battery, it will drain the battery.

      I think the best option for you is to get hold of one of those Supercheap Auto (or similar) jump start devices.
      I have one of these and did think about it but it was quite large. I'm hoping for something tiny.

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      • #4
        Re: Uninterrupted viewing of media player when restarting engine

        My Kenwood unit picks up where it left off. (similarly with a gps destination)
        It was an option setting in the menu........ any chance there is a software option setting?
        [color=#0040FF]Rob[/color]
        [color=#0040BF]2012 Altitude D4D &
        04 Jayco Eagle Outback[/color]

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        • #5
          Re: Uninterrupted viewing of media player when restarting engine

          Originally posted by Signature035
          any chance there is a software option setting?
          No.

          Comment


          • #6
            Re: Uninterrupted viewing of media player when restarting engine

            edited better answers given :wink:
            Cheers, Wayne

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            • #7
              Re: Uninterrupted viewing of media player when restarting engine

              just a thought, y dont you go to a car stereo place and get a 1 farret capacitor, they use the on big stereo installs , they r put in front of a sub woofer amp to provide a clean uninterupted power supply to the amp,they r usually wired straight from the battery then to the positive power to the amp, maybe this might be able to keep power to the dvd player so you dont lose you spot, what do others think. cheers samo
              had an 03 gx 120 with some gear now got a 2013 bt 50 GT auto some ARB gear.

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              • #8
                Re: Uninterrupted viewing of media player when restarting engine

                The cigarette and accessory plugs are switched off while cranking.


                The one farad cap may be just enough to fix the issue. To work out how long it would theoretically last ... Time (seconds) = (Voltage * Capacitor) / Current

                So if its a 1F and 2A then you would get about 7.2 seconds. But a cap is only good for about 50% of usable power and needs to stay above about 7V for the 5V regulator.


                Otherwise a small sealed lead acid battery like whats on house alarms or the NIMH batteries you suggested would do the job. Just use a couple of diodes to stop the voltage reg and the batteries feeding into each other.
                '98 Grande V6 - ARB Sahara bar, IPF HID spotties, ARB compressor, GME UHF, OME Sport suspension, 265/75 MT ATZ 4 Ribs, steel rock sliders, Safari snorkel, Tigerz11 winch, rear ARB locker, Rhino platform rack.

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                • #9
                  Re: Uninterrupted viewing of media player when restarting engine

                  Thanks all for your input.
                  Originally posted by VL400
                  The cigarette and accessory plugs are switched off while cranking.
                  That's what I thought.

                  The one farad cap may be just enough to fix the issue. To work out how long it would theoretically last ... Time (seconds) = (Voltage * Capacitor) / Current

                  So if its a 1F and 2A then you would get about 7.2 seconds.
                  Can you run that by me again? I'm using 5V, 1F and 1.5A which should give 3.3s.

                  But a cap is only good for about 50% of usable power and needs to stay above about 7V for the 5V regulator.
                  I imagine that the cap is installed between the 5V regulator and the input to the media player. Is this the wrong way of doing it? From reading your comment, it appears that the cap is installed between the cig lighter socket and the 5V regulator.

                  Otherwise a small sealed lead acid battery like whats on house alarms or the NIMH batteries you suggested would do the job. Just use a couple of diodes to stop the voltage reg and the batteries feeding into each other.
                  With the NiMH batts, I'm thinking of using Eneloops as they are a low self discharge battery. If I draw 1.5 amps for 5 seconds, those batteries with 2Ah capacity should theoretically last nearly 1,000 engine cranks before depleting. Given on a 2 week journey where there are 2 engine restarts per day (average), that will do. Plus I've got plenty of these batteries for my Nikon Speedlight.

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                  • #10
                    Re: Uninterrupted viewing of media player when restarting engine

                    If you were to go down the capacitor path it would be installed non the 12V side of the regulator.

                    I think the small battery pack and a couple of diodes might work, although AA size batteries may have a hard time delivering 1.5A. I have never tried to see what peak current they will put out. The way a batteries AH rating is calculated is normally using a discharge rate that takes 20HRs to get to 100% flat - a 2000maH pack is not tested by being connected to a 2A load for an hour, its not a linear function sadly. So its going to be substantially less than an hours run time at 1.5A too.
                    '98 Grande V6 - ARB Sahara bar, IPF HID spotties, ARB compressor, GME UHF, OME Sport suspension, 265/75 MT ATZ 4 Ribs, steel rock sliders, Safari snorkel, Tigerz11 winch, rear ARB locker, Rhino platform rack.

                    Comment


                    • #11
                      Re: Uninterrupted viewing of media player when restarting engine

                      Just to update this thread...

                      Lat night, myself and a mate more conversant in electronics tried an experiment with a direct connection using 4xAAA batts. The media player powered up and got to the menu but the batteries were quickly drained.

                      We then tried 4xAAA alkalines (6V) and it was a no go. Too much voltage. So we then used his circuit consisting of caps and diodes which causes a 0.7V drop to bring it down closer to 5.3V. The media player powered up but I could not see the movies on the HDD. So there is a bit of a problem with the HDD powering up or insufficient current to spin the platters.

                      As per tileys suggestion, I found the SLA jump starter device. I haven't used it for a long time as there was a problem with the supplied power supply where it did not want to charge the device properly. As a result, it couldn't jump start vehicles. This morning, I plugged the jump starter into the car's cig lighter plug and the charging LED came on. It looks like it was charging up. I had a 12VDC 200mA power supply sitting around but it looks like it couldn't handle it.

                      Another mate has a 12VDC 5A power supply so I'll try that tonight to get the jump starter fully charged up. Then I'm not sure whether to leave it plugged into the car as I'm not sure whether the charging circuit is capable of going into trickle charge mode.

                      Nevertheless, the jump starter haven't been out of the shed for a few years now so I'm not sure what the condition of the SLA battery is....

                      I haven't gone to the extent of the other suggestion of buying 1F caps yet. Are they pricey?

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                      • #12
                        Re: Uninterrupted viewing of media player when restarting engine

                        Sounds like your SLA jump start battery was never properly charged. If stored like that for a few years, it's almost certain to be stuffed. But after charging you MIGHT get enough out of it to prove your concept. Don't expect it to carry a load for long, though.
                        2007 D4D GXL.Suspension by Ultimate, Minto - modest lift.DIY shelf unit (help from ORS, Narellan).Polyairs.Dual batteries with RanOx smart DC-DC charger.Towing a Kimberley Karavan with another RanOx.

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                        • #13
                          Re: Uninterrupted viewing of media player when restarting engine

                          Well, the SLA is confirmed to be stuffed. It was left on charge all night and no sign of anything in the morning.

                          Comment

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