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How exact does voltage need to be?
bigh4th:
Most battery operated electronics are designed to have a little "give and take" with the power input. No battery is a perfect 1.5 volts, 6 volts, etc... Freshly charged they're higher than their written voltage, and after use they're lower than their listed voltage, but the device still works properly. This is exactly how devices with a "low battery" warning works. I'll use a game boy for example. Once the voltage drops below a certain point, it will trigger a low battery LED, but the game will still function properly until the batteries are about flat dead.
That said, the voltage listed on the device is the MAX constant voltage it should have. Its not really an issue with batteries as the voltage will drop with useage. However, a wall-wart is supplying constant voltage that could damage the item.
I would hook a volt meter up to the adapter so that you can read the voltage with the game on and hooked to the tv. If the output is still over 6 volts, I would rig up something like the post above says. I MYSELF would run it around 5.75 volts give or take, but 6 volts won't hurt it either.
Remember: with battery opperated devices, its (usualy) always better to go with too little than too much.
-Harry
fjl:
I really wouldn't wory about it. Those things cost like what, $10 dollars? If it breaks which I highly doubt it will, you can just get another one. Just try it.
HoopstarsGarage:
As most have said, you need not worry..
I would guarantee that your "Jakks Device" has an internal voltage regulator since it is microprocessor based - for the most part micro's need rock solid +5v rails.
The internal regulator will easily handle 10% - 15% higher voltages.
Hoops
bluevolume:
Agree with the previous posts. If it takes batteries, its probably at least designed to handle 1.5 and 1.2 (common with rechargeables) volt batteries. That margin alone should allow for your delta. Long term use shouldn't be a concern either, with these modern circuits it more or less burns out immediately or is fine.