MDfreak Posted April 27, 2006 Report Share Posted April 27, 2006 (edited) UPDATE: Dutch DIY-instructions can be found here:http://www.mdcenter.nl/artikelen/mzrh1/batterypack.php(hope for an English translation soon)As promised in our RH1 review I would provide you with an alternative for the dry-battery-case we know from different MD-walkmans but that is absent with the MZ-RH1.Today I got the final components for the prototype and it showed the battery-pack works as expected. Detailed plans on how to build one yourself will be available soon but for now I just want to show you that it is possible to make a simple alternative for the dry-battery-case.Battery-pack "proof of concept".WARNING! Directly connecting 4 non-rechargable AA's or fully charged Ni-MH batteries can produce a too high voltage on the RH1's USB port and can cause permanent damage to the RH1. But because we had to return the RH1 to Sony before finishing the final prototype we carefully tried if the concept works with almost empty Ni-MH batteries.Battery-pack prototype.As you see we added some extra electronics to make the batterypack more safe to use with the RH1 and it also makes it more userfriendly. Furthermore the RH1 is back to Sony so sadly we could not take a final picture of the RH1 connected to the prototype of the batterypack.Estimated batterylifeBased upon calculations when using 2500 mAh Ni-MH batteries.- around 33 hours of PCM recording- around 125 hours of Hi-LP playback- around 6,5 full charges of the Li-ION batteryExtra features- voltage regulation to regulate battery-voltage.- can be used without the need of a Li-ION in the RH1.- can be used to charge the Li-ION.- can be used to power the RH1 during normal operation (e.g. recording or playback).- on/off switch to turn of the power to the electronics.- power-LED indicating the batterypack is on.- low battery LED indicating the batterypack is almost empty.- adjustable low battery indication: by adjusting the variable resistor you can adjust on which moment the low battery LED will go on allowing you to adjust the time between the LED lighting up and the moment the batteries are fully empty.- can also power other USB-devices that use USB-bus-power like e.g. mp3-playersBasically the RH1 will not see the difference between this batterypack and the supplied AC-adapter. So everything you would use your AC-adapter for you can use this battery-pack for.P.s. as said before: detailed plans on how to build one yourself will follow soon. Please do not try to make a batterypack yourself without understanding how it works as it can damage your RH1 so that it will not work anymore. Edited July 30, 2006 by MDfreak Quote Link to comment Share on other sites More sharing options...
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