Archos Av400 Battery
Posted in Uncategorized on Nov 30th, 2009
Archos AV400 mains adaptor problem?
I have an Archos portable video recorder/Player Model AV400 with 80GB hard disk with internal rechargeable battery and mains adapter for longer indoor use and recharging.
Unfortunately the mains adapter malfunctioned and I am abroad for 2 months and cant find a correct replacement in stock anywhere.
But noticed a camcorder mains adapter I have with me, had a similar DC connector and upon connecting it the Archos worked with it. However there is a difference in the Output Voltage/Amp specification and I am concerned it may cause damage to the Video recorder.
The original adapter is DC output; 5V,1.6 A and the camcorder adapter I am trying on it has a higher Output, DC 8.4 V, 1.5A.
Question: Is the extra voltage going to cause damage to the Archos unit or can I use the temp adaptor until I can get proper replacement in about 2 month time when returning home?
The charging circuit in most players have a voltage regulation circuit that is designed to accept adapters that provide a slightly higher voltage than is actually needed to charge and run the players. The Archos battery is probably 3.7v which is standard for lithium-ion batteries. The charging voltage needs to be somewhere above that so I would guess the operating voltage needed is around 4 – 4.5 volts.
The voltage regulating circuits are designed to take the 5 volts as input and output the operating voltage. In doing so, they will dissipate heat and are designed for a maximum input voltage.
The question is how tolerant the voltage regulating circuits are of input voltages significantly higher than what they are expecting. You might be fine with the Archos running a bit hot while on charge – or you may be setting the stage for a failure of the regulator which will totally disable the device.
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