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if you are to charge a dual bat modded bit (2.4V on car) with a 6V supply (4*AA bats) won’t you blow the board?
ph2t, if you look at the cct diag for the Rx, you will see a componnet that the 1.2v goes into before it goes to the rxc2 chip. This is a dc-dc device that has a stabilised 3.3v output. This 3.3v output does not change as the Vcc is changed, although I dont know how high (or low) you can go with Vcc before you cause problems. A range of 1.2v to 6v certainly works OK tho. If you blow something by going too high with Vcc, it will probably be this component.
As far as charging a 2.4v bit goes, a 4xAA 6V setup self ‘limits’ the charging current to just over an amp on first commection…..due to the internal resistance of the AAs I think. If you were to use a small 6V lead acid battery, the initial charging current is well over 2 amps and the 1/3AAAs get hot before they are charged. A series load resistor (2ohm 5W) softens the peak at connection, and flattens the current curve as the cells resistance increases.
Hope this helps.
Geography update…….
I’m sitting in a noisey little internet “cafe” (and I use that term very loosely) while the wife has a massage on Charwen beach, Koh Samui, Thailand. No sign of bits in the stores here, but it is a resort island so I’ll wait until Bangkok next week. Missing my little cars but lots and lots of distractions. Weather, food, hospitality, people and places are all amazing. Waitor, bring me another drink…
uA :D:D:D:D:D
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